CYWUSB6935-48LTXC,PDF,CYWUSB6935-48LTXC PDF资料,Datasheet,下载CYWUSB6935-48LTXC技术资料

CYWUSB6935

WirelessUSB™ LR 2.4 GHz DSSS Radio

SoC

■ Low standby current < 1 µA

Features

■ Integrated 30-bit Manufacturing ID

■ Operating voltage from 2.7 V to 3.6 V

■ 2.4-GHz radio transceiver

■ Operates in the unlicensed Industrial, Scientific, and Medical

(ISM) band (2.4 GHz to 2.483 GHz)

■ Operating temperature from –40 °C to 85 °C

■ Offered in a small footprint 48 QFN

■ Receive sensitivity: –95 dBm

■ Up to 0 dBm output power

Functional Description

■ Range of up to 50 meters or more

■ Data throughput of up to 62.5 kbits/sec

The CYWUSB6935 transceiver is a single-chip 2.4 GHz DSSS

Gaussian Frequency Shift Keying (GFSK) baseband modem

radio that connects directly to a microcontroller via a simple serial

peripheral interface.

■ Highly integrated low cost, minimal number of external compo-

nents required

The CYWUSB6935 is offered in an industrial temperature range

48-pin QFN and a commercial temperature range 48-pin QFN.

■ Dual direct sequence spread spectrum (DSSS) reconfigurable

baseband correlators

■ SPI microcontroller interface (up to 2 MHz data rate)

■ 13-MHz input clock operation

Logic Block Diagram – CYWUSB6935

DIOVAL

DIO

GFSK

Modulator

DSSS

Baseband

A

RFOUT

SERDES

IRQ

A

SS

SCK

MISO

MOSI

DSSS

Baseband

B

Digital

SERDES

B

GFSK

Demodulator

RFIN

RESET

PD

Synthesizer

Cypress Semiconductor Corporation

Document Number : 38-16008 Rev. *G

•

198 Champion Court

•

San Jose, CA 95134-1709

•

408-943-2600

Revised October 05, 2010

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CYWUSB6935

Contents

Applications ......................................................................3

Applications Support ...................................................3

Functional Overview ........................................................3

2.4 GHz Radio .............................................................3

GFSK Modem ..............................................................3

Dual DSSS Baseband .................................................3

Serializer/Deserializer (SERDES) ...............................4

Application Interfaces ..................................................4

Clocking and Power Management ..............................4

Receive Signal Strength Indicator (RSSI) ...................4

Application Interfaces ......................................................4

SPI Interface ................................................................4

DIO Interface ...............................................................6

Interrupts .....................................................................6

Application Examples ......................................................7

Register Descriptions ......................................................8

Absolute Maximum Ratings ..........................................25

Operating Conditions .....................................................25

DC Characteristics (Over the Operating Range) ............25

AC Characteristics .........................................................26

Radio Parameters .....................................................28

Power Management Timing ......................................29

Typical Operating Characteristics .............................30

Ordering Information ......................................................32

Ordering Code Definition ...........................................32

Package Diagram ............................................................33

Acronyms ........................................................................34

Document Conventions .................................................34

Document History Page .................................................35

Sales, Solutions, and Legal Information ......................36

Worldwide Sales and Design Support .......................36

Products ....................................................................36

PSoC Solutions .........................................................36

Document Number : 38-16008 Rev. *G

Page 2 of 36

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CYWUSB6935

2.4 GHz Radio

Applications

The receiver and transmitter are a single-conversion, low-Inter-

mediate Frequency (low-IF) architecture with fully integrated IF

channel matched filters to achieve high performance in the

presence of interference. An integrated Power Amplifier (PA)

provides an output power control range of 30 dB in seven steps.

■ Building/Home Automation

❐ Climate Control

❐ Lighting Control

❐ Smart Appliances

❐ On-Site Paging Systems

❐ Alarm and Security

Table 1. Internal PA Output Power Step Table

PA Setting

Typical Output Power (dBm)

■ Industrial Control

7

6

5

4

3

2

1

0

❐ Inventory Management

❐ Factory Automation

❐ Data Acquisition

–2.4

–5.6

–9.7

■ Automatic Meter Reading (AMR)

–16.4

–20.8

–24.8

–29.0

■ Transportation

❐ Diagnostics

❐ Remote Keyless Entry

■ Consumer / PC

❐ Locator Alarms

❐ Presenter Tools

❐ Remote Controls

❐ Toys

Both the receiver and transmitter integrated Voltage Controlled

Oscillator (VCO) and synthesizer have the agility to cover the

complete 2.4-GHz GFSK radio transmitter ISM band. The

synthesizer provides the frequency-hopping local oscillator for

the transmitter and receiver. The VCO loop filter is also

integrated on-chip.

Applications Support

The CYWUSB6935 is supported by both the CY3632

WirelessUSB Development Kit and the CY3635 WirelessUSB

N:1 Development Kit. The CY3635 development kit provides all

of the materials and documents needed to cut the cord on multi-

point to point and point-to-point low bandwidth, high node density

applications including four small form-factor sensor boards and

a hub board that connects to WirelessUSB LR RF module

boards, a software application that graphically demonstrates the

multipoint to point protocol, comprehensive WirelessUSB

protocol code examples and all of the associated schematics,

gerber files and bill of materials. The WirelessUSB N:1 Devel-

opment Kit is also supported by the WirelessUSB Listener Tool.

GFSK Modem

The transmitter uses a DSP-based vector modulator to convert

the 1-MHz chips to an accurate GFSK carrier.

The receiver uses a fully integrated Frequency Modulator (FM)

detector with automatic data slicer to demodulate the GFSK

signal.

Dual DSSS Baseband

Data is converted to DSSS chips by a digital spreader.

De-spreading is performed by an oversampled correlator. The

DSSS baseband cancels spurious noise and assembles

properly correlated data bytes.

Functional Overview

The DSSS baseband has three operating modes: 64-chips/bit

Single Channel, 32-chips/bit Single Channel, and 32-chips/bit

Single Channel Dual Data Rate (DDR).

The CYWUSB6935 provides a complete SPI-to-antenna radio

modem. The CYWUSB6935 is designed to implement wireless

devices operating in the worldwide 2.4-GHz Industrial, Scientific,

and Medical (ISM) frequency band (2.400 GHz–2.4835 GHz). It

is intended for systems compliant with world-wide regulations

covered by ETSI EN 301 489-1 V1.4.1, ETSI EN 300 328-1

V1.3.1 (European Countries); FCC CFR 47 Part 15 (USA and

Industry Canada) and ARIB STD-T66 (Japan).

64 Chips/Bit Single Channel

The baseband supports a single data stream operating at 15.625

kbits/sec. The advantage of selecting this mode is its ability to

tolerate a noisy environment. This is because the 15.625

kbits/sec data stream utilizes the longest PN Code resulting in

the highest probability for recovering packets over the air. This

mode can also be selected for systems requiring data transmis-

sions over longer ranges.

The CYWUSB6935 contains a 2.4-GHz radio transceiver, a

GFSK modem, and a dual DSSS reconfigurable baseband. The

radio and baseband are both code- and frequency-agile.

Forty-nine spreading codes selected for optimal performance

(Gold codes) are supported across 78 1-MHz channels yielding

32 Chips/Bit Single Channel

a

theoretical spectral capacity of 3822 channels. The

The baseband supports a single data stream operating at 31.25

kbits/sec.

CYWUSB6935 supports a range of up to 50 meters or more.

32 Chips/Bit Single Channel Dual Data Rate (DDR)

The baseband spreads bits in pairs and supports a single data

stream operating at 62.5 kbits/sec.

Document Number : 38-16008 Rev. *G

Page 3 of 36

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CYWUSB6935

reset for a new conversion until the receive mode is toggled off

and on. After a connection has been established, the RSSI

register can be read to determine the relative connection quality

of the channel. A RSSI register value lower than 10 indicates that

the received signal strength is low, a value greater than 28

indicates a strong signal level.

Serializer/Deserializer (SERDES)

CYWUSB6935 provides data Serializer/Deserializer

a

(SERDES), which provides byte-level framing of transmit and

receive data. Bytes for transmission are loaded into the SERDES

and receive bytes are read from the SERDES via the SPI

interface. The SERDES provides double buffering of transmit

and receive data. While one byte is being transmitted by the

radio the next byte can be written to the SERDES data register

insuring there are no breaks in transmitted data.

To check for a quiet channel before transmitting, first set up

receive mode properly and read the RSSI register (Reg 0x22). If

the valid bit is zero, then force the Carrier Detect register (Reg

0x2F, bit 7=1) to initiate an ADC conversion. Then, wait greater

than 50 μs and read the RSSI register again. Next, clear the

Carrier Detect Register (Reg 0x2F, bit 7=0) and turn the receiver

OFF. Measuring the noise floor of a quiet channel is inherently a

'noisy' process so, for best results, this procedure should be

repeated several times (~20) to compute an average noise floor

level. A RSSI register value of 0-10 indicates a channel that is

relatively quiet. A RSSI register value greater than 10 indicates

the channel is probably being used. A RSSI register value

greater than 28 indicates the presence of a strong signal.

After a receive byte has been received it is loaded into the

SERDES data register and can be read at any time until the next

byte is received, at which time the old contents of the SERDES

data register will be overwritten.

Application Interfaces

CYWUSB6935 has a fully synchronous SPI slave interface for

connectivity to the application MCU. Configuration and

byte-oriented data transfer can be performed over this interface.

An interrupt is provided to trigger real time events.

Application Interfaces

An optional SERDES Bypass mode (DIO) is provided for appli-

cations that require a synchronous serial bit-oriented data path.

This interface is for data only.

SPI Interface

The CYWUSB6935 has a four-wire SPI communication interface

between an application MCU and one or more slave devices.

The SPI interface supports single-byte and multi-byte serial

transfers. The four-wire SPI communications interface consists

of Master Out-Slave In (MOSI), Master In-Slave Out (MISO),

Serial Clock (SCK), and Slave Select (SS).

Clocking and Power Management

A 13-MHz crystal is directly connected to X13IN and X13 without

the need for external capacitors. The CYWUSB6935 has a

programmable trim capability for adjusting the on-chip load

capacitance supplied to the crystal.

The SPI receives SCK from an application MCU on the SCK pin.

Data from the application MCU is shifted in on the MOSI pin.

Data to the application MCU is shifted out on the MISO pin. The

active-low Slave Select (SS) pin must be asserted to initiate a

SPI transfer.

Below are the requirements for the crystal to be directly

connected to X13IN and X13:

■ Nominal frequency: 13 MHz

■ Operating mode: Fundamental mode

■ Resonance mode: Parallel resonant

■ Frequency stability: ±30 ppm

■ Series resistance: <100 ohms

■ Load capacitance: 10 pF

The application MCU can initiate a SPI data transfer via a

multi-byte transaction. The first byte is the Command/Address

byte, and the following bytes are the data bytes as shown in

Figure 2 through Figure 3. The SS signal should not be

deasserted between bytes. The SPI communications interface is

as follows:

■ Drive level: 10 μW to 100 μW

■ Command Direction (bit 7) = “0” Enables SPI read transaction.

A “1” enables SPI write transactions.

The radio frequency (RF) circuitry has on-chip decoupling capac-

itors. The CYWUSB6935 is powered from a 2.7-V to 3.6-V DC

supply. The CYWUSB6935 can be shut down to a fully static

state using the PD pin.

■ Command Increment (bit 6) = “1” Enables SPI auto address

increment. When set, the address field automatically incre-

ments at the end of each data byte in a burst access, otherwise

the same address is accessed.

Receive Signal Strength Indicator (RSSI)

The RSSI register (Reg 0x22) returns the relative signal strength

of the ON-channel signal power and can be used to:

■ Six bits of address.

■ Eight bits of data.

1. Determine the connection quality

2. Determine the value of the noise floor

3. Check for a quiet channel before transmitting.

The SPI communications interface has a burst mechanism,

where the command byte can be followed by as many data bytes

as desired. A burst transaction is terminated by deasserting the

slave select (SS = 1). For burst read transactions, the application

MCU must abide by the timing shown in Figure 11.

The internal RSSI voltage is sampled through

a 5-bit

analog-to-digital converter (ADC). A state machine controls the

conversion process. Under normal conditions, the RSSI state

machine initiates a conversion when an ON-channel carrier is

detected and remains above the noise floor for over 50 μs. The

conversion produces a 5-bit value in the RSSI register (Reg

0x22, bits 4:0) along with a valid bit, RSSI register (Reg 0x22, bit

5). The state machine then remains in HALT mode and does not

The SPI communications interface single read and burst read

sequences are shown in Figure 1 and Figure 2, respectively.

The SPI communications interface single write and burst write

sequences are shown in Figure 3 and Figure 4, respectively.

Document Number : 38-16008 Rev. *G

Page 4 of 36

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CYWUSB6935

Table 2. SPI Transaction Format

Byte 1

Byte 1+N

[7:0]

Bit #

7

6

[5:0]

Bit Name

DIR

INC

Address

Data

Figure 1. SPI Single Read Sequence

S C K

S S

c m d

a d d r

D IR

IN C

M O S I

M IS O

A 5

A 4

A 3

A 2

A 1

A 0

0

d a ta to m c u

D 7

D 6

D 5

D 4

D 3

D 2

D 1

D 0

Figure 2. SPI Burst Read Sequence

S C K

S S

cm d

addr

D IR

IN C

M O S I

M IS O

0

1

A 5

A 4

A 3

A 2

A 1

A 0

data to m cu

1+N

1

D 7

D 6

D 5

D 4

D 3

D 2

D 1

D 0

D 7

D 6

D 5

D 4

D 3

D 2

D 1

D 0

Figure 3. SPI Single Write Sequence

SCK

SS

cmd

addr

data from mcu

DIR

INC

MOSI

MISO

D6

D5

D4

D3

D2

D1

D0

A5

A4

A3

A2

A1

A0

D7

1

0

Figure 4. SPI Burst Write Sequence

SCK

SS

cmd

addr

data from mcu

1+N

1

DIR

INC

MOSI

MISO

D7

D6

D5

D4

D3

D2

D1

D0

D7

D6

D5

D4

D3

D2

D1

D0

1

A5

A4

A3

A2

A1

A0

Document Number : 38-16008 Rev. *G

Page 5 of 36

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CYWUSB6935

Wake Interrupt

DIO Interface

When the PD pin is low, the oscillator is stopped. After PD is

deasserted, the oscillator takes time to start, and until it has done

so, it is not safe to use the SPI interface. The wake interrupt

indicates that the oscillator has started, and that the device is

ready to receive SPI transfers.

The DIO communications interface is an optional SERDES

bypass data-only transfer interface. In receive mode, DIO and

DIOVAL are valid after the falling edge of IRQ, which clocks the

data as shown in Figure 5. In transmit mode, DIO and DIOVAL

are sampled on the falling edge of the IRQ, which clocks the data

as shown in Figure 6. The application MCU samples the DIO and

DIOVAL on the rising edge of IRQ.

The wake interrupt is enabled by setting bit 0 of the Wake Enable

register (Reg 0x1C, bit 0=1). Whether or not a wake interrupt is

pending is indicated by the state of bit 0 of the Wake Status

register (Reg 0x1D, bit 0). Reading the Wake Status register

(Reg 0x1D) clears the interrupt.

Interrupts

The CYWUSB6935 features three sets of interrupts: transmit,

received, and a wake interrupt. These interrupts all share a

single pin (IRQ), but can be independently enabled/disabled. In

transmit mode, all receive interrupts are automatically disabled,

and in receive mode all transmit interrupts are automatically

disabled. However, the contents of the enable registers are

preserved when switching between transmit and receive modes.

Transmit Interrupts

Four interrupts are provided to flag the occurrence of transmit

events. The interrupts are enabled by writing to the Transmit

Interrupt Enable register (Reg 0x0D), and their status may be

determined by reading the Transmit Interrupt Status register

(Reg 0x0E). If more than 1 interrupt is enabled, it is necessary to

read the Transmit Interrupt Status register (Reg 0x0E) to

determine which event caused the IRQ pin to assert.

Interrupts are enabled and the status read through 6 registers:

Receive Interrupt Enable (Reg 0x07), Receive Interrupt Status

(Reg 0x08), Transmit Interrupt Enable (Reg 0x0D), Transmit

Interrupt Status (Reg 0x0E), Wake Enable (Reg 0x1C), Wake

Status (Reg 0x1D).

The function and operation of these interrupts are described in

detail in Section .

If more than 1 interrupt is enabled at any time, it is necessary to

read the relevant interrupt status register to determine which

event caused the IRQ pin to assert. Even when a given interrupt

source is disabled, the status of the condition that would

otherwise cause an interrupt can be determined by reading the

appropriate interrupt status register. It is therefore possible to

use the devices without making use of the IRQ pin at all.

Firmware can poll the interrupt status register(s) to wait for an

event, rather than using the IRQ pin.

Receive Interrupts

Eight interrupts are provided to flag the occurrence of receive

events, four each for SERDES A and B. In 64 chips/bit and 32

chips/bit DDR modes, only the SERDES A interrupts are

available, and the SERDES B interrupts will never trigger, even

if enabled. The interrupts are enabled by writing to the Receive

Interrupt Enable register (Reg 0x07), and their status may be

determined by reading the Receive Interrupt Status register (Reg

0x08). If more than one interrupt is enabled, it is necessary to

read the Receive Interrupt Status register (Reg 0x08) to

determine which event caused the IRQ pin to assert.

The polarity of all interrupts can be set by writing to the Configu-

ration register (Reg 0x05), and it is possible to configure the IRQ

pin to be open drain (if active low) or open source (if active high).

The function and operation of these interrupts are described in

detail in Section .

Figure 5. DIO Receive Sequence

IRQ

DIOVAL

DIO

v8

v9

v10

d10

v11

d11

v12

d12

v13

d13

v14

d14

v...

d...

v0

d0

v1

d1

v2

d2

v3

d3

v4

d4

v5

d5

v6

v7

data to mcu

d6

d7

d8

d9

Figure 6. DIO Transmit Sequence

IRQ

DIOVAL

DIO

v8

v9

v10

v11

d11

v12

d12

v13

d13

v14

d14

v...

d...

v0

v1

v2

d2

v3

d3

v4

d4

v5

v6

v7

data from mcu

d8

d9

d10

d0

d1

d5

d6

d7

Document Number : 38-16008 Rev. *G

Page 6 of 36

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CYWUSB6935

Application Examples

Figure 7 shows a block diagram example of a typical battery powered device using the CYWUSB6935 chip.

Figure 8 shows an application example of a WirelessUSB LR alarm system where a single hub node is connected to an alarm panel.

The hub node wirelessly receives information from multiple sensor nodes in order to control the alarm panel.

Figure 7. CYWUSB6935 Battery Powered Device

LDO/

DC2DC

3.3 V

PCB Trace

Antenna

0.1μF

+

-

Battery

2.0 pF

1.2 pF

3.3 nH

Vcc

RESET

RFIN

PD

RFOUT

PSoC™

8-bit MCU

Application

Hardware

2.2 nH

27 pF

IRQ

WirelessUSB LR

13MHz

Crystal

SPI

4

Figure 8. WirelessUSB LR Alarm System

PSoC + SMOKE

DETECTOR

W irelessUSB LR

ALARM PANEL

PSoC + MOTION

DETECTOR

PSoC + DOOR

SENSOR

W irelessUSB LR +

PSoC

…

W irelessUSB LR

PSoC + KEYPAD

Document Number : 38-16008 Rev. *G

Page 7 of 36

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CYWUSB6935

Register Descriptions

Table 3 displays the list of registers inside the CYWUSB6935 that are addressable through the SPI interface. All registers are read

and writable, except where noted.

Table 3. CYWUSB6935 Register Map^[1]

CYWUSB6935

Register Name

Mnemonic

Page

Default

Access

Address

Revision ID

REG_ID

0x00

8

0x07

RO

RW

RO

RW

RO

RW

RO

RW

RO

RW

RO

Control

REG_CONTROL

REG_DATA_RATE

REG_CONFIG

0x03

9

0x00

Data Rate

0x04

10

11

12

13

14

15

16

17

18

19

20

21

22

0x00

Configuration

SERDES Control

0x05

0x01

REG_SERDES_CTL

0x06

0x03

Receive SERDES Interrupt Enable REG_RX_INT_EN

Receive SERDES Interrupt Status REG_RX_INT_STAT

0x07

0x00

0x08

0x00

Receive SERDES Data A

Receive SERDES Valid A

Receive SERDES Data B

Receive SERDES Valid B

REG_RX_DATA_A

REG_RX_VALID_A

REG_RX_DATA_B

REG_RX_VALID_B

0x09

0x00

0x0A

0x0B

0x0C

0x0D

0x0E

0x0F

0x10

0x00

Transmit SERDES Interrupt Enable REG_TX_INT_EN

Transmit SERDES Interrupt Status REG_TX_INT_STAT

0x00

Transmit SERDES Data

Transmit SERDES Valid

PN Code

REG_TX_DATA

REG_TX_VALID

0x00

0x1E8B6A3DE0E9B222

REG_PN_CODE

0x18–0x11

0x19

Threshold Low

Threshold High

Wake Enable

REG_THRESHOLD_L

REG_THRESHOLD_H

REG_WAKE_EN

0x08

0x38

0x00

0x01

0x04

0x00

0x64

–

0x1A

0x1C

0x1D

0x20

Wake Status

REG_WAKE_STAT

REG_ANALOG_CTL

REG_CHANNEL

Analog Control

Channel

0x21

Receive Signal Strength Indicator REG_RSSI

0x22

PA Bias

REG_PA

0x23

Crystal Adjust

REG_CRYSTAL_ADJ

REG_VCO_CAL

0x24

VCO Calibration

Reg Power Control

Carrier Detect

0x26

REG_PWR_CTL

0x2E

0x2F

0x32

REG_CARRIER_DETECT

REG_CLOCK_MANUAL

REG_CLOCK_ENABLE

REG_SYN_LOCK_CNT

REG_MID

Clock Manual

Clock Enable

0x33

Synthesizer Lock Count

Manufacturing ID

0x38

0x3C–0x3F

Note

1. All registers are accessed Little Endian.

Document Number : 38-16008 Rev. *G

Page 8 of 36

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CYWUSB6935

Table 4. Revision ID Register

Addr: 0x00

REG_ID

Default: 0x07

7

6

5

4

3

2

1

0

Silicon ID

Product ID

Bit

Name

Description

7:4 Silicon ID

These are the Silicon ID revision bits. 0000 = Rev A, 0001 = Rev B, etc. These bits are read-only.

3:0 Product ID These are the Product ID revision bits. Fixed at value 0111. These bits are read-only.

Table 5. Control

Addr: 0x03

REG_CONTROL

Default: 0x00

7

6

5

4

3

2

1

0

RX

Enable

TX

Enable

PN Code

Select

BypassInternal Auto Internal

Internal PA

Enable

Reserved

Syn Lock

Signal

PA

Disable

Bit

Name

Description

7

RX Enable

The Receive Enable bit is used to place the IC in receive mode.

1 = Receive Enabled

0 = Receive Disabled

6

5

TX Enable

The Transmit Enable bit is used to place the IC in transmit mode.

1 = Transmit Enabled

0 = Transmit Disabled

PN Code

Select

The Pseudo-Noise Code Select bit selects between the upper or lower half of the 64 chips/bit PN code.

1 = 32 Most Significant Bits of PN code are used

0 = 32 Least Significant Bits of PN code are used

This bit applies only when the Code Width bit is set to 32 chips/bit PN codes (Reg 0x04, bit 2=1).

4

Bypass

Internal Syn

Lock Signal

This bit controls whether the state machine waits for the internal Syn Lock Signal before waiting for the amount

of time specified in the Syn Lock Count register (Reg 0x38), in units of 2 μs. If the internal Syn Lock Signal is

used then set Syn Lock Count to 25 to provide additional assurance that the synthesizer has settled.

1 = Bypass the Internal Syn Lock Signal and wait the amount of time in Syn Lock Count register (Reg 0x38)

0 = Wait for the Syn Lock Signal and then wait the amount of time specified in Syn Lock Count register (Reg

0x38)

It is recommended that the application MCU sets this bit to 1 in order to guarantee a consistent settle time for

the synthesizer.

3

2

Auto Internal The Auto Internal PA Disable bit is used to determine the method of controlling the Internal Power Amplifier.

PA Disable

The two options are automatic control by the baseband or by firmware through register writes. For external PA

usage, please see the description of the REG_ANALOG_CTL register (Reg 0x20).

1 = Register controlled Internal PA Enable

0 = Auto controlled Internal PA Enable

When this bit is set to 1, the enabled state of the Internal PA is directly controlled by bit Internal PA Enable (Reg

0x03, bit 2). It is recommended that this bit is set to 0, leaving the PA control to the baseband.

Internal PA

Enable

The Internal PA Enable bit is used to enable or disable the Internal Power Amplifier.

1 = Internal Power Amplifier Enabled

0 = Internal Power Amplifier Disabled

This bit only applies when the Auto Internal PA Disable bit is selected (Reg 0x03, bit 3=1), otherwise this bit is

don’t care.

1

0

Reserved

This bit is reserved and should be written with a zero.

Document Number : 38-16008 Rev. *G

Page 9 of 36

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CYWUSB6935

Table 6. Data Rate

Addr: 0x04

REG_DATA_RATE

Default: 0x00

7

6

5

4

3

2

1

0

Reserved

Code Width

Data Rate

Sample Rate

Bit

Name

Description

7:3 Reserved

These bits are reserved and should be written with zeroes.

2^[2]Code Width The Code Width bit is used to select between 32 chips/bit and 64 chips/bit PN codes.

1 = 32 chips/bit PN codes

0 = 64 chips/bit PN codes

The number of chips/bit used impacts a number of factors such as data throughput, range and robustness to

interference. By choosing a 32 chips/bit PN-code, the data throughput can be doubled or even quadrupled (when

double data rate is set). A 64 chips/bit PN code offers improved range over its 32 chips/bit counterpart as well as

more robustness to interference. By selecting to use a 32 chips/bit PN code a number of other register bits are

impacted and need to be addressed. These are PN Code Select (Reg 0x03, bit 5), Data Rate (Reg 0x04, bit 1),

and Sample Rate (Reg 0x04, bit 0).

1^[2]Data Rate The Data Rate bit allows the user to select Double Data Rate mode of operation which delivers a raw data rate

of 62.5kbits/sec.

1 = Double Data Rate - 2 bits per PN code (No odd bit transmissions)

0 = Normal Data Rate - 1 bit per PN code

This bit is applicable only when using 32 chips/bit PN codes which can be selected by setting the Code Width bit

(Reg 0x04, bit 2=1). When using Double Data Rate, the raw data throughput is 62.5 kbits/sec because every 32

chips/bit PN code is interpreted as 2 bits of data. When using this mode a single 64 chips/bit PN code is placed

in the PN code register. This 64 chips/bit PN code is then split into two and used by the baseband to offer the

Double Data Rate capability. When using Normal Data Rate, the raw data throughput is 32 kbits/sec. Additionally,

Normal Data Rate enables the user to potentially correlate data using two differing 32 chips/bit PN codes.

0^[2]Sample

Rate

The Sample Rate bit allows the use of the 12x sampling when using 32 chips/bit PN codes and Normal Data Rate.

1 = 12x Oversampling

0 = 6x Oversampling

Using 12x oversampling improves the correlators receive sensitivity. When using 64 chips/bit PN codes or Double

Data Rate this bit is don’t care. The only time when 12x oversampling can be selected is when a 32 chips/bit PN

code is being used with Normal Data Rate.

Note

2. The following Reg 0x04, bits 2:0 values are not valid:

•

001–Not Valid

010–Not Valid

011–Not Valid

111–Not Valid

Document Number : 38-16008 Rev. *G

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Table 7. Configuration

Addr: 0x05

REG_CONFIG

Default: 0x01

1 0

7

6

5

4

3

2

Reserved

IRQ Pin Select

Bit

Name

Description

These bits are reserved and should be written with zeroes.

7:2 Reserved

1:0 IRQ Pin Select The Interrupt Request Pin Select bits are used to determine the drive method of the IRQ pin.

11 = Open Source (IRQ asserted = 1, IRQ deasserted = Hi-Z)

10 = Open Drain (IRQ asserted = 0, IRQ deasserted = Hi-Z)

01 = CMOS (IRQ asserted = 1, IRQ deasserted = 0)

00 = CMOS Inverted (IRQ asserted = 0, IRQ deasserted = 1)

Table 8. SERDES Control

Addr: 0x06

REG_SERDES_CTL

Default: 0x03

7

6

5

4

3

2

1

0

Reserved

SERDES

Enable

EOF Length

Bit

Name

Description

7:4 Reserved

These bits are reserved and should be written with zeroes.

3

SERDES

Enable

The SERDES Enable bit is used to switch between bit-serial mode and SERDES mode.

1 = SERDES enabled

0 = SERDES disabled, bit-serial mode enabled

When the SERDES is enabled data can be written to and read from the IC one byte at a time, through the

use of the SERDES Data registers. The bit-serial mode requires bits to be written one bit at a time through

the use of the DIO/DIOVAL pins, refer to section 3.2. It is recommended that SERDES mode be used to avoid

the need to manage the timing required by the bit-serial mode.

2:0 EOF Length

The End of Frame Length bits are used to set the number of sequential bit times for an inter-frame gap without

valid data before an EOF event will be generated. When in receive mode and a valid bit has been received

the EOF event can then be identified by the number of bit times that expire without correlating any new data.

The EOF event causes data to be moved to the proper SERDES Data Register and can also be used to

generate interrupts. If 0 is the EOF length, an EOF condition will occur at the first invalid bit after a valid

reception.

Document Number : 38-16008 Rev. *G

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Table 9. Receive SERDES Interrupt Enable

Addr: 0x07

REG_RX_INT_EN

Default: 0x00

7

6

5

4

3

2

1

0

Underflow B

Overflow B

EOF B

Full B

Underflow A

Overflow A

EOF A

Full A

Bit

Name

Description

7

6

5

Underflow B The Underflow B bit is used to enable the interrupt associated with an underflow condition with the Receive

SERDES Data B register (Reg 0x0B)

1 = Underflow B interrupt enabled for Receive SERDES Data B

0 = Underflow B interrupt disabled for Receive SERDES Data B

An underflow condition occurs when attempting to read the Receive SERDES Data B register (Reg 0x0B) when

it is empty.

Overflow B

EOF B

The Overflow B bit is used to enable the interrupt associated with an overflow condition with the Receive

SERDES Data B register (Reg 0x0B)

1 = Overflow B interrupt enabled for Receive SERDES Data B

0 = Overflow B interrupt disabled for Receive SERDES Data B

An overflow condition occurs when new received data is written into the Receive SERDES Data B register (Reg

0x0B) before the prior data is read out.

The End of Frame B bit is used to enable the interrupt associated with the Channel B Receiver EOF condition.

1 = EOF B interrupt enabled for Channel B Receiver

0 = EOF B interrupt disabled for Channel B Receiver

The EOF IRQ asserts during an End of Frame condition. End of Frame conditions occur after at least one bit

has been detected, and then the number of invalid bits in the frame exceeds the number in the EOF length field.

If 0 is the EOF length, and EOF condition will occur at the first invalid bit after a valid reception. This IRQ is

cleared by reading the receive status register

4

Full B

The Full B bit is used to enable the interrupt associated with the Receive SERDES Data B register (Reg 0x0B)

having data placed in it.

1 = Full B interrupt enabled for Receive SERDES Data B

0 = Full B interrupt disabled for Receive SERDES Data B

A Full B condition occurs when data is transferred from the Channel B Receiver into the Receive SERDES Data

B register (Reg 0x0B). This could occur when a complete byte is received or when an EOF event occurs whether

or not a complete byte has been received.

3

2

1

Underflow A The Underflow A bit is used to enable the interrupt associated with an underflow condition with the Receive

SERDES Data A register (Reg 0x09)

1 = Underflow A interrupt enabled for Receive SERDES Data A

0 = Underflow A interrupt disabled for Receive SERDES Data A

An underflow condition occurs when attempting to read the Receive SERDES Data A register (Reg 0x09) when

it is empty.

Overflow A

EOF A

The Overflow A bit is used to enable the interrupt associated with an overflow condition with the Receive

SERDES Data A register (0x09)

1 = Overflow A interrupt enabled for Receive SERDES Data A

0 = Overflow A interrupt disabled for Receive SERDES Data A

An overflow condition occurs when new receive data is written into the Receive SERDES Data A register (Reg

0x09) before the prior data is read out.

The End of Frame A bit is used to enable the interrupt associated with an End of Frame condition with the Channel

A Receiver.

1 = EOF A interrupt enabled for Channel A Receiver

0 = EOF A interrupt disabled for Channel A Receiver

The EOF IRQ asserts during an End of Frame condition. End of Frame conditions occur after at least one bit

has been detected, and then the number of invalid bits in a frame exceeds the number in the EOF length field.

If 0 is the EOF length, an EOF condition will occur at the first invalid bit after a valid reception. This IRQ is cleared

by reading the receive status register.

0

Full A

The Full A bit is used to enable the interrupt associated with the Receive SERDES Data A register (0x09) having

data written into it.

1 = Full A interrupt enabled for Receive SERDES Data A

0 = Full A interrupt disabled for Receive SERDES Data A

A Full A condition occurs when data is transferred from the Channel A Receiver into the Receive SERDES Data

A register (Reg 0x09). This could occur when a complete byte is received or when an EOF event occurs whether

or not a complete byte has been received.

Document Number : 38-16008 Rev. *G

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Table 10. Receive SERDES Interrupt Status^[3]

Addr: 0x08

REG_RX_INT_STAT

Default: 0x00

7

6

5

4

3

2

1

0

Valid B

Flow Violation B

EOF B

Full B

Valid A

Flow Violation A

EOF A

Full A

Bit

Name

Description

7

Valid B

The Valid B bit is true when all the bits in the Receive SERDES Data B register (Reg 0x0B) are valid.

1 = All bits are valid for Receive SERDES Data B

0 = Not all bits are valid for Receive SERDES Data B

When data is written into the Receive SERDES Data B register (Reg 0x0B) this bit is set if all of the bits within the

byte that has been written are valid. This bit cannot generate an interrupt.

6

Flow

The Flow Violation B bit is used to signal whether an overflow or underflow condition has occurred for the Receive

Violation B SERDES Data B register (Reg 0x0B).

1 = Overflow/underflow interrupt pending for Receive SERDES Data B

0 = No overflow/underflow interrupt pending for Receive SERDES Data B

Overflow conditions occur when the radio loads new data into the Receive SERDES Data B register (Reg 0x0B)

before the prior data has been read. Underflow conditions occur when trying to read the Receive SERDES Data B

register (Reg 0x0B) when the register is empty. This bit is cleared by reading the Receive Interrupt Status register

(Reg 0x08)

5

4

EOF B

Full B

The End of Frame B bit is used to signal whether an EOF event has occurred on the Channel B receive.

1 = EOF interrupt pending for Channel B

0 = No EOF interrupt pending for Channel B

An EOF condition occurs for the Channel B Receiver when receive has begun and then the number of bit times

specified in the SERDES Control register (Reg 0x06) elapse without any valid bits being received. This bit is cleared

by reading the Receive Interrupt Status register (Reg 0x08)

The Full B bit is used to signal when the Receive SERDES Data B register (Reg 0x0B) is filled with data.

1 = Receive SERDES Data B full interrupt pending

0 = No Receive SERDES Data B full interrupt pending

A Full B condition occurs when data is transferred from the Channel B Receiver into the Receive SERDES Data B

register (Reg 0x0B). This could occur when a complete byte is received or when an EOF event occurs whether or

not a complete byte has been received.

3

2

Valid A

Flow

The Valid A bit is true when all of the bits in the Receive SERDES Data A Register (Reg 0x09) are valid.

1 = All bits are valid for Receive SERDES Data A

0 = Not all bits are valid for Receive SERDES Data A

When data is written into the Receive SERDES Data A register (Reg 0x09) this bit is set if all of the bits within the

byte that has been written are valid. This bit cannot generate an interrupt.

The Flow Violation A bit is used to signal whether an overflow or underflow condition has occurred for the Receive

Violation A SERDES Data A register (Reg 0x09).

1 = Overflow/underflow interrupt pending for Receive SERDES Data A

0 = No overflow/underflow interrupt pending for Receive SERDES Data A

Overflow conditions occur when the radio loads new data into the Receive SERDES Data A register (Reg 0x09)

before the prior data has been read. Underflow conditions occur when trying to read the Receive SERDES Data A

register (Reg 0x09) when the register is empty. This bit is cleared by reading the Receive Interrupt Status register

(Reg 0x08)

1

0

EOF A

Full A

The End of Frame A bit is used to signal whether an EOF event has occurred on the Channel A receive.

1 = EOF interrupt pending for Channel A

0 = No EOF interrupt pending for Channel A

An EOF condition occurs for the Channel A Receiver when receive has begun and then the number of bit times

specified in the SERDES Control register (0x06) elapse without any valid bits being received. This bit is cleared by

reading the Receive Interrupt Status register (Reg 0x08).

The Full A bit is used to signal when the Receive SERDES Data A register (Reg 0x09) is filled with data.

1 = Receive SERDES Data A full interrupt pending

0 = No Receive SERDES Data A full interrupt pending

A Full A condition occurs when data is transferred from the Channel A Receiver into the Receive SERDES Data A

Register (Reg 0x09). This could occur when a complete byte is received or when an EOF event occurs whether or

not a complete byte has been received.

Note

3. All status bits are set and readable in the registers regardless of IRQ enable status. This allows a polling scheme to be implemented without enabling IRQs. The status

bits are affected by TX Enable and RX Enable (Reg 0x03, bits 7:6). For example, the receive status will read 0 if the IC is not in receive mode. These registers are

read-only.

Document Number : 38-16008 Rev. *G

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Table 11. Receive SERDES Data A

Addr: 0x09

REG_RX_DATA_A

Default: 0x00

7

6

5

4

3

2

1

0

Data

Bit Name

Description

7:0 Data Received Data for Channel A. The over-the-air received order is bit 0 followed by bit 1, followed by bit 2, followed by

bit 3, followed by bit 4, followed by bit 5, followed by bit 6, followed by bit 7. This register is read-only.

Table 12. Receive SERDES Valid A

Addr: 0x0A

REG_RX_VALID_A

Default: 0x00

7

6

5

4

3

2

1

0

Valid

Bit Name

Description

7:0 Valid

These bits indicate which of the bits in the Receive SERDES Data A register (Reg 0x09) are valid. A “1” indicates that

the corresponding data bit is valid for Channel A.

If the Valid Data bit is set in the Receive Interrupt Status register (Reg 0x08) all eight bits in the Receive SERDES Data

A register (Reg 0x09) are valid. Therefore, it is not necessary to read the Receive SERDES Valid A register (Reg 0x0A).

This register is read-only.

Table 13. Receive SERDES Data B

Addr: 0x0B

REG_RX_DATA_B

Default: 0x00

7

6

5

4

3

2

1

0

Data

Bit Name

Description

7:0 Data

Received Data for Channel B. The over-the-air received order is bit 0 followed by bit 1, followed by bit 2, followed by

bit 3, followed by bit 4, followed by bit 5, followed by bit 6, followed by bit 7. This register is read-only.

Table 14. Receive SERDES Valid B

Addr: 0x0C

REG_RX_VALID_B

Default: 0x00

7

6

5

4

3

2

1

0

Valid

Bit Name

Description

7:0 Valid These bits indicate which of the bits in the Receive SERDES Data B register (Reg 0x0B) are valid. A “1” indicates that

the corresponding data bit is valid for Channel B.

If the Valid Data bit is set in the Receive Interrupt Status register (0x08) all eight bits in the Receive SERDES Data B

register (Reg 0x0B) are valid. Therefore, it is not necessary to read the Receive SERDES Valid B register (Reg 0x0C).

This register is read-only.

Document Number : 38-16008 Rev. *G

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Table 15. Transmit SERDES Interrupt Enable

Addr: 0x0D

REG_TX_INT_EN

Default: 0x00

7

6

5

4

3

2

1

0

Reserved

Underflow

Overflow

Done

Empty

Bit

Name

Description

7:4 Reserved These bits are reserved and should be written with zeroes.

3

Underflow The Underflow bit is used to enable the interrupt associated with an underflow condition associated with the

Transmit SERDES Data register (Reg 0x0F)

1 = Underflow interrupt enabled

0 = Underflow interrupt disabled

An underflow condition occurs when attempting to transmit while the Transmit SERDES Data register (Reg 0x0F)

does not have any data.

2

Overflow The Overflow bit is used to enabled the interrupt associated with an overflow condition with the Transmit SERDES

Data register (0x0F).

1 = Overflow interrupt enabled

0 = Overflow interrupt disabled

An overflow condition occurs when attempting to write new data to the Transmit SERDES Data register (Reg 0x0F)

before the preceding data has been transferred to the transmit shift register.

1

0

Done

The Done bit is used to enable the interrupt that signals the end of the transmission of data.

1 = Done interrupt enabled

0 = Done interrupt disabled

The Done condition occurs when the Transmit SERDES Data register (Reg 0x0F) has transmitted all of its data

and there is no more data for it to transmit.

Empty

The Empty bit is used to enable the interrupt that signals when the Transmit SERDES register (Reg 0x0F) is empty.

1 = Empty interrupt enabled

0 = Empty interrupt disabled

The Empty condition occurs when the Transmit SERDES Data register (Reg 0x0F) is loaded into the transmit buffer

and it's safe to load the next byte

Document Number : 38-16008 Rev. *G

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Table 16. Transmit SERDES Interrupt Status^[4]

Addr: 0x0E

REG_TX_INT_STAT

Default: 0x00

7

6

5

4

3

2

1

0

Reserved

Underflow

Overflow

Done

Empty

Bit

Name

Description

7:4 Reserved These bits are reserved. This register is read-only.

3

Underflow The Underflow bit is used to signal when an underflow condition associated with the Transmit SERDES Data register

(Reg 0x0F) has occurred.

1 = Underflow Interrupt pending

0 = No Underflow Interrupt pending

This IRQ will assert during an underflow condition to the Transmit SERDES Data register (Reg 0x0F). An underflow

occurs when the transmitter is ready to sample transmit data, but there is no data ready in the Transmit SERDES

Data register (Reg 0x0F). This will only assert after the transmitter has transmitted at least one bit. This bit is cleared

by reading the Transmit Interrupt Status register (Reg 0x0E).

2

Overflow The Overflow bit is used to signal when an overflow condition associated with the Transmit SERDES Data register

(0x0F) has occurred.

1 = Overflow Interrupt pending

0 = No Overflow Interrupt pending

This IRQ will assert during an overflow condition to the Transmit SERDES Data register (Reg 0x0F). An overflow

occurs when the new data is loaded into the Transmit SERDES Data register (Reg 0x0F) before the previous data

has been sent. This bit is cleared by reading the Transmit Interrupt Status register (Reg 0x0E).

1

0

Done

Empty

The Done bit is used to signal the end of a data transmission.

1 = Done Interrupt pending

0 = No Done Interrupt pending

This IRQ will assert when the data is finished sending a byte of data and there is no more data to be sent. This will

only assert after the transmitter has transmitted as least one bit. This bit is cleared by reading the Transmit Interrupt

Status register (Reg 0x0E)

The Empty bit is used to signal when the Transmit SERDES Data register (Reg 0x0F) has been emptied.

1 = Empty Interrupt pending

0 = No Empty Interrupt pending

This IRQ will assert when the transmit serdes is empty. When this IRQ is asserted it is ok to write to the Transmit SERDES Data

register (Reg 0x0F). Writing the Transmit SERDES Data register (Reg 0x0F) will clear this IRQ. It will be set when the data is loaded

into the transmitter, and it is ok to write new data.

Note

4. All status bits are set and readable in the registers regardless of IRQ enable status. This allows a polling scheme to be implemented without enabling IRQs. The status

bits are affected by the TX Enable and RX Enable (Reg 0x03, bits 7:6). For example, the transmit status will read 0 if the IC is not in transmit mode. These registers

are read-only.

Document Number : 38-16008 Rev. *G

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Table 17. Transmit SERDES Data

Addr: 0x0F

REG_TX_DATA

Default: 0x00

7

6

5

4

3

2

1

0

Data

Bit Name

Description

7:0 Data Transmit Data. The over-the-air transmitted order is bit 0 followed by bit 1, followed by bit 2, followed by bit 3, followed

by bit 4, followed by bit 5, followed by bit 6, followed by bit 7.

Table 18. Transmit SERDES Valid

Addr: 0x10

REG_TX_VALID

Default: 0x00

7

6

5

4

3

2

1

0

Valid

Bit Name

Description

7:0 Valid^[5]The Valid bits are used to determine which of the bits in the Transmit SERDES Data register (reg 0x0F) are valid.

1 = Valid transmit bit

0 = Invalid transmit bit

Default:

0x1E8B6A3DE0E9B222

Addr: 0x18-11

REG_PN_CODE

63 62 61 60 59 58 57 56 55 54 53 52 51 50 49 48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33 32

Address 0x18

Address 0x17

Address 0x16

Address 0x15

Table 19. PN Code

31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10

9

8

7

6

5

4

3

2

1

0

Address 0x14

Address 0x13

Address 0x12

Address 0x11

Bit

Name

Description

63:0 PN Codes The value inside the 8 byte PN code register is used as the spreading code for DSSS communication. All 8 bytes

can be used together for 64 chips/bit PN code communication, or the registers can be split into two sets of 32

chips/bit PN codes and these can be used alone or with each other to accomplish faster data rates. Not any 64

chips/bit value can be used as a PN code as there are certain characteristics that are needed to minimize the

possibility of multiple PN codes interfering with each other or the possibility of invalid correlation. The over-the-air

order is bit 0 followed by bit 1... followed by bit 62, followed by bit 63.

Note

5. The Valid bit in the Transmit SERDES Valid register (Reg 0x10) is used to mark whether the radio will send data or preamble during that bit time of the data byte. Data

is sent LSB first. The SERDES will continue to send data until there are no more VALID bits in the shifter. For example, writing 0x0F to the Transmit SERDES Valid

register (Reg 0x10) will send half a byte.

Document Number : 38-16008 Rev. *G

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Table 20. Threshold Low

Addr: 0x19

REG_THRESHOLD_L

Default: 0x08

7

6

5

4

3

2

1

0

Reserved

Threshold Low

Bit

Name

Reserved

Description

7

This bit is reserved and should be written with zero.

6:0 Threshold Low The Threshold Low value is used to determine the number of missed chips allowed when attempting to

correlate a single data bit of value ‘0’. A perfect reception of a data bit of ‘0’ with a 64 chips/bit PN code would

result in zero correlation matches, meaning the exact inverse of the PN code has been received. By setting

the Threshold Low value to 0x08 for example, up to eight chips can be erroneous while still identifying the

value of the received data bit. This value along with the Threshold High value determine the correlator count

values for logic ‘1’ and logic ‘0’. The threshold values used determine the sensitivity of the receiver to inter-

ference and the dependability of the received data. By allowing a minimal number of erroneous chips the

dependability of the received data increases while the robustness to interference decreases. On the other

hand increasing the maximum number of missed chips means reduced data integrity but increased

robustness to interference and increased range.

Table 21. Threshold High

Addr: 0x1A

REG_THRESHOLD_H

Default: 0x38

7

6

5

4

3

2

1

0

Reserved

Threshold High

Bit

Name

Description

7

Reserved

This bit is reserved and should be written with zero.

6:0 Threshold High The Threshold High value is used to determine the number of matched chips allowed when attempting to

correlate a single data bit of value ‘1’. A perfect reception of a data bit of ‘1’ with a 64 chips/bit or a 32 chips/bit

PN code would result in 64 chips/bit or 32 chips/bit correlation matches, respectively, meaning every bit was

received perfectly. By setting the Threshold High value to 0x38 (64-8) for example, up to eight chips can be

erroneous while still identifying the value of the received data bit. This value along with the Threshold Low

value determine the correlator count values for logic ‘1’ and logic ‘0’. The threshold values used determine

the sensitivity of the receiver to interference and the dependability of the received data. By allowing a minimal

number of erroneous chips the dependability of the received data increases while the robustness to inter-

ference decreases. On the other hand increasing the maximum number of missed chips means reduced data

integrity but increased robustness to interference and increased range.

Table 22. Wake Enable

Addr: 0x1C

REG_WAKE_EN

Default: 0x00

7

6

5

4

3

2

1

0

Reserved

Wakeup

Enable

Bit

Name

Description

7:1 Reserved

These bits are reserved and should be written with zeroes.

0

Wakeup

Enable

Wakeup interrupt enable.

0 = disabled

1 = enabled

A wakeup event is triggered when the PD pin is deasserted and once the IC is ready to receive SPI communi-

cations.

Document Number : 38-16008 Rev. *G

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Table 23. Wake Status

Addr: 0x1D

REG_WAKE_STAT

Default: 0x01

1 0

7

6

5

4

3

2

Reserved

Wakeup Status

Bit

Name

Description

7:1 Reserved

These bits are reserved. This register is read-only.

0

Wakeup Status Wakeup status.

0 = Wake interrupt not pending

1 = Wake interrupt pending

This IRQ will assert when a wakeup condition occurs. This bit is cleared by reading the Wake Status register

(Reg 0x1D). This register is read-only.

Table 24. Analog Control

Addr: 0x20

REG_ANALOG_CTL

Default: 0x00

7

6

5

4

3

2

1

0

Reserved

Reg Write

Control

MID Read

Enable

Reserved

PA Output

Enable

PA Invert

Reset

Bit

Name

Reserved

Description

7

6

This bit is reserved and should be written with zero.

Reg Write

Control

Enables write access to Reg 0x2E and Reg 0x2F.

1 = Enables write access to Reg 0x2E and Reg 0x2F

0 = Reg 0x2E and Reg 0x2F are read-only

5

MID Read

Enable

The MID Read Enable bit must be set to read the contents of the Manufacturing ID register (Reg 0x3C-0x3F).

Enabling the Manufacturing ID register (Reg 0x3C-0x3F) consumes power. This bit should only be set when

reading the contents of the Manufacturing ID register (Reg 0x3C-0x3F).

1 = Enables read of MID registers

0 = Disables read of MID registers

4:3 Reserved

These bits are reserved and should be written with zeroes.

2

1

0

PA Output

Enable

The Power Amplifier Output Enable bit is used to enable the PACTL pin for control of an external power

amplifier.

1 = PA Control Output Enabled on PACTL pin

0 = PA Control Output Disabled on PACTL pin

PA Invert

Reset

The Power Amplifier Invert bit is used to specify the polarity of the PACTL signal when the PaOe bit is set

high. PA Output Enable and PA Invert cannot be simultaneously changed.

1 = PACTL active low

0 = PACTL active high

The Reset bit is used to generate a self-clearing device reset.

1 = Device Reset. All registers are restored to their default values.

0 = No Device Reset.

Table 25. Channel

Addr: 0x21

REG_CHANNEL

Default: 0x00

7

6

5

4

3

2

1

0

Reserved

Channel

Bit

Name

Description

7

Reserved This bit is reserved and should be written with zero.

6:0 Channel

The Channel register (Reg 0x21) is used to determine the Synthesizer frequency. A value of 2 corresponds to a

communication frequency of 2.402 GHz, while a value of 79 corresponds to a frequency of 2.479 GHz. The channels

are separated from each other by 1 MHz intervals.

Limit application usage to channels 2–79 to adhere to FCC regulations. FCC regulations require that channels 0

and 1 and any channel greater than 79 be avoided. Use of other channels may be restricted by other regulatory

agencies. The application MCU must ensure that this register is modified before transmitting data over the air for

the first time.

Document Number : 38-16008 Rev. *G

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Table 26. Receive Signal Strength Indicator (RSSI)^[6]

Addr: 0x22

REG_RSSI

Default: 0x00

7

6

5

4

3

2

1

0

Reserved

Valid

RSSI

Bit

Name

Description

7:6 Reserved These bits are reserved. This register is read-only.

5

Valid

The Valid bit indicates whether the RSSI value in bits [4:0] are valid. This register is Read Only.

1 = RSSI value is valid

0 = RSSI value is invalid

4:0 RSSI

The Receive Strength Signal Indicator (RSSI) value indicates the strength of the received signal. This is a read only

value with the higher values indicating stronger received signals meaning more reliable transmissions.

Table 27. PA Bias

Addr: 0x23

REG_PA

Default: 0x00

7

6

5

4

3

2

1

0

Reserved

PA Bias

Bit

Name

Description

7:3 Reserved These bits are reserved and should be written with zeroes.

2:0 PA Bias

The Power Amplifier Bias (PA Bias) bits are used to set the transmit power of the IC through increasing (values up

to 7) or decreasing (values down to 0) the gain of the on-chip Power Amplifier. The higher the register value the

higher the transmit power. By changing the PA Bias value signal strength management functions can be accom-

plished. For general purpose communication a value of 7 is recommended. See Table 1 for typical output power

steps based on the PA Bias bit settings.

Table 28. Crystal Adjust

Addr: 0x24

REG_CRYSTAL_ADJ

Default: 0x00

7

6

5

4

3

2

1

0

Reserved

Clock Output

Disable

Crystal Adjust

Bit

7

6

Name

Description

This bit is reserved and should be written with zero.

The Clock Output Disable bit disables the 13-MHz clock driven on the X13OUT pin.

1 = No 13-MHz clock driven externally

Reserved

Clock Output

Disable

0 = 13-MHz clock driven externally

If the 13-MHz clock is driven on the X13OUT pin then receive sensitivity will be reduced by –4 dBm on

channels 5+13n. By default the 13-MHz clock output pin is enabled. This pin is useful for adjusting the

13-MHz clock, but it interfere with every 13th channel beginning with 2.405-GHz channel. Therefore, it is

recommended that the 13-MHz clock output pin be disabled when not in use.

5:0 Crystal Adjust

The Crystal Adjust value is used to calibrate the on-chip parallel load capacitance supplied to the crystal.

Each increment of the Crystal Adjust value typically adds 0.135 pF of parallel load capacitance. The total

range is 8.5 pF, starting at 8.65 pF. These numbers do not include PCB parasitics, which can add an

additional 1–2 pF.

Note

6. The RSSI will collect a single value each time the part is put into receive mode via Control register (Reg 0x03, bit 7=1). See Section for more details.

Document Number : 38-16008 Rev. *G

Page 20 of 36

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Table 29. VCO Calibration

Addr: 0x26

REG_VCO_CAL

Default: 0x00

7

6

5

4

3

2

1

0

VCO Slope Enable

Reserved

\

Bit

Name

Description

7:6 VCOSlopeEnable The Voltage Controlled Oscillator (VCO) Slope Enable bits are used to specify the amount of variance

(Write-Only)

automatically added to the VCO.

11 = –5/+5 VCO adjust. The application MCU must configure this option during initialization

10 = –2/+3 VCO adjust

01 = Reserved

00 = No VCO adjust

These bits are undefined for read operations.

5:0 Reserved

These bits are reserved and should be written with zeroes.

Table 30. Reg Power Control

Addr: 0x2E

REG_PWR_CTL

Default: 0x00

7

6

5

4

3

2

1

0

Reg Power

Control

Reserved

Bit

Name

Description

7

Reg Power When set, this bit disables unused circuitry and saves radio power. The user must set Reg 0x20, bit 6 = 1 to

Control

enable writes to Reg 0x2E. The application MCU must set this bit during initialization.

6:0 Reserved

These bits are reserved and should be written with zeroes.

Table 31. Carrier Detect

Addr: 0x2F

REG_CARRIER_DETECT

Default: 0x00

7

6

5

4

3

2

1

0

Carrier Detect

Override

Reserved

Bit

Name

Description

7

Carrier Detect Override When set, this bit overrides carrier detect. The user must set Reg 0x20, bit 6=1 to enable writes to

Reg 0x2F.

6:0 Reserved

These bits are reserved and should be written with zeroes.

Table 32. Clock Manual

Addr: 0x32

REG_CLOCK_MANUAL

Default: 0x00

7

6

5

4

3

2

1

0

Manual Clock Overrides

Bit

Name

Description

7:0 Manual Clock Overrides This register must be written with 0x41 after reset for correct operation

Document Number : 38-16008 Rev. *G

Page 21 of 36

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Table 33. Clock Enable

Addr: 0x33

REG_CLOCK_ENABLE

Default: 0x00

7

6

5

4

3

2

1

0

Manual Clock Enables

Bit

Name

Description

This register must be written with 0x41 after reset for correct operation

7:0 Manual Clock

Enables

Table 34. Synthesizer Lock Count

Addr: 0x38

REG_SYN_LOCK_CNT

Default: 0x64

7

6

5

4

3

2

1

0

Count

Bit Name

Description

7:0 Count Determines the length of delay in 2-µs increments for the synthesizer to lock when auto synthesizer is enabled via

Control register (0x03, bit 1=0) and not using the PLL lock signal. The default register setting is typically sufficient.

Table 35. Manufacturing ID

Addr: 0x3C-3F

REG_MID

31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10

9

8

7

6

5

4

3

2

1

0

Address 0x3F

Address 0x3E

Address 0x3D

Address 0x3C

Bit

Name

Description

31:30 Address[31:30] These bits are read back as zeroes.

29:0 Address[29:0] These bits are the Manufacturing ID (MID) for each IC. The contents of these bits cannot be read unless the

MID Read Enable bit (bit 5) is set in the Analog Control register (Reg 0x20). Enabling the Manufacturing ID

register (Reg 0x3C-0x3F) consumes power. The MID Read Enable bit in the Analog Control register (Reg

0x20, bit 5) should only be set when reading the contents of the Manufacturing ID register (Reg 0x3C-0x3F).

This register is read-only.

Document Number : 38-16008 Rev. *G

Page 22 of 36

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Table 36. Pin Description

Pin QFN

Name

Type

Default

Description

Analog RF

46

5

RFIN

RFOUT

Input

N/A

RF Input. Modulated RF signal received.

Output

RF Output. Modulated RF signal to be transmitted.

Crystal / Power Control

38

35

26

33

X13

Input

N/A

Crystal Input. (refer to Clocking and Power Management on page 4).

X13IN

X13OUT

PD

Output/Hi-Z

Input

Output System Clock. Buffered 13-MHz system clock.

N/A

PowerDown. Assertingthisinput (low), willput theICinthe SuspendMode

(X13OUT is 0 when PD is Low).

14

34

RESET

PACTL

Input

I/O

N/A

Active LOW Reset. Device reset.

Input

PACTL. External Power Amplifier control. Pull-down or make output.

SERDES Bypass Mode Communications/Interrupt

20

19

21

DIO

I/O

Input

Data Input/Output. SERDES Bypass Mode Data Transmit/Receive.

Data I/O Valid. SERDES Bypass Mode Data Transmit/Receive Valid.

DIOVAL

IRQ

Output /Hi-Z

Output IRQ. Interrupt and SERDES Bypass Mode DIOCLK.

SPI Communications

23

24

25

22

MOSI

MISO

SCK

SS

Input

Output/Hi-Z

Input

N/A

Hi-Z

N/A

Master-Output-Slave-Input Data. SPI data input pin.

Master-Input-Slave-Output Data. SPI data output pin.

SPI Input Clock. SPI clock.

Input

Slave Select Enable. SPI enable.

Power and Ground

V_CC= 2.7V to 3.6V.

6, 9, 16, 28,

29, 32, 41, VCC

42, 44, 45

VCC

GND

H

L

Ground = 0 V.

13

GND

Must be tied to Ground.

1, 2, 3, 4, 7,

8, 10, 11,

12, 15, 17,

18, 27, 30, NC

31, 36, 37,

39, 40, 43,

47, 48

N/A

L

Must be tied to Ground.

Exposed GND

paddle

GND

Document Number : 38-16008 Rev. *G

Page 23 of 36

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Figure 9. CYWUSB6935 48 QFN – Top View

CYWUSB6935

Top View*

NC

1

2

3

4

5

6

7

8

9

36 NC

35 X13IN

34 PACTL

NC

PD

33

RFOUT

V_CC

32 V_CC

31

30

29

28

NC

V_CC

CYWUSB6935

48 QFN

NC

V_CC

NC 10

NC 11

NC 12

27 NC

26 X13OUT

25 SCK

* E-PAD BOTTOM SIDE

Document Number : 38-16008 Rev. *G

Page 24 of 36

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CYWUSB6935

Absolute Maximum Ratings

Operating Conditions

Storage temperature................................. –65 °C to +150 °C

Ambient temperature with power applied . –55 °C to +125 °C

Supply voltage on V_CCrelative to VSS.........–0.3 V to +3.9 V

DC voltage to logic inputs^[7].................. –0.3 V to V_CC+0.3 V

V_CC(Supply Voltage)........................................2.7 V to 3.6 V

T_A(Ambient temperature under bias)...... –40 °C to +85 °C^[9]

T_A(Ambient temperature under bias)...........0°C to +70°C^[10]

Ground Voltage................................................................. 0 V

DC voltage applied to

F_OSC(Oscillator or crystal frequency)........................ 13 MHz

outputs in high-Z state.......................... –0.3 V to V_CC+0.3 V

Static discharge voltage (Digital)^[8]...........................>2000 V

Static discharge Voltage (RF)^[8]................................... 500 V

Latch up current.......................................+200 mA, –200 mA

DC Characteristics (Over the Operating Range)

Parameter

V_CC

Description

Conditions

Min

Typ^[12]Max

Unit

V

Supply voltage

2.7

3.0

V_CC

3.0

0.0

–

3.6

–

V_OH1

Output high voltage condition 1

Output high voltage condition 2

Output low voltage

At I_OH= –100.0 µA V_CC– 0.1

V

V_OH2

At I_OH= –2.0 mA

At I_OL= 2.0 mA

2.4

–

V

V_OL

0.4

V

[11]

V_IH

Input high voltage

2.0

–0.3

–1

–

V_CC

V

V_IL

Input low voltage

–

0.8

+1

10

15

–

V

I_IL

Input leakage current

0 < V_IN< V_CC

0.26

3.5

0.24

3

µA

pF

µA

mA

µA

mA

C_IN

Pin input capacitance (except X13, X13IN, RFIN)

Current consumption during power-down mode PD = LOW

I_Sleep

–

IDLE I_CC

STARTUP I_CC

TX AVG I_CC

RX I_{CC (PEAK)}

TX I_{CC (PEAK)}

Current consumption without synthesizer

ICC from PD high to oscillator stable.

Average transmitter current consumption^[13]

Current consumption during receive

Current consumption during transmit

PD = HIGH

–

1.8

1.4

57.7

69.1

28.7

–

SYNTH SETTLE Current consumption with synthesizer on, no

–

I_CC

transmit or receive

Notes

7. It is permissible to connect voltages above V to inputs through a series resistor limiting input current to 1 mA. This can’t be done during power down mode.

CC

AC timing not guaranteed.

8. Human Body Model (HBM).

9. Industrial temperature operating range.

10. Commercial temperature operating range.

11. It is permissible to connect voltages above V to inputs through a series resistor limiting input current to 1 mA.

CC

12. Typ. values measured with V = 3.0V @ 25°C

CC

13. Average I when transmitting a 10-byte packet every 15 minutes using the WirelessUSB N:1 protocol.

CC

Document Number : 38-16008 Rev. *G

Page 25 of 36

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AC Characteristics ^[14]

Table 37. SPI Interface^[16]

Parameter

Description

Min

476

238

158

10

97^[16]

77^[16]

250

80

Typ

–

Max

Unit

ns

t_{SCK_CYC}

t_{SCK_HI (BURST READ)}

t_{SCK_HI}

SPI clock period

–

[15]

SPI clock high time

–

SPI clock high time

–

t_{SCK_LO}

SPI clock low time

–

t_{DAT_SU}

SPI input data setup time

SPI input data hold time

SPI output data valid time

–

t_{DAT_HLD}

t_{DAT_VAL}

t_{SS_SU}

–

174^[16]

SPI slave select setup time before first positive edge of SCK^[17]

–

t_{SS_HLD}

SPI slave select hold time after last negative edge of SCK

–

Figure 10. SPI Timing Diagram

t_{SCK_CYC}

t_{SCK_HI}

t_{SCK_LO}

SCK

SS

t_{SS_SU}

t_{SS_HLD}

t_{DAT_SU}

t_{DAT_HLD}

data from m cu

data to m cu

data

M O SI

M ISO

t_{DAT_VAL}

data to m cu

Figure 11. SPI Burst Read Every 9th SCK HI Stretch Timing Diagram

t_{SCK_CYC}

t_{SCK_HI}

every 8^thSCK_HI

t_{SCK_LO}

t_{SCK_HI (BURST READ)}

every 9^thSCK_HI

every 10^thSCK_HI

SCK

SS

data to mcu

data

MISO

t_{DAT_VAL}

Notes

14. AC values are not guaranteed if voltages on any pin exceed V

.

CC

15. This stretch only applies to every 9th SCK HI pulse for SPI Burst Reads only.

16. For F = 13 MHz, 3.3V @ 25°C.

OSC

17. SCK must start low, otherwise the success of SPI transactions are not guaranteed.

Document Number : 38-16008 Rev. *G

Page 26 of 36

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Table 38. DIO Interface

Parameter

Transmit

Description

Min.

Typ.

Max.

Unit

t_{TX_DIOVAL_SU}

t_{TX_DIO_SU}

DIOVAL setup time

2.1

0

–

µs

DIO setup time

DIOVAL hold time

DIO hold time

t_{TX_DIOVAL_HLD}

t_{TX_DIO_HLD}

t_{TX_IRQ_HI}

–

0

–

Minimum IRQ high time – 32 chips/bit DDR

Minimum IRQ high time – 32 chips/bit

Minimum IRQ high time – 64 chips/bit

Minimum IRQ low time – 32 chips/bit DDR

Minimum IRQ low time – 32 chips/bit

Minimum IRQ low time – 64 chips/bit

–

8

–

16

32

8

–

t_{TX_IRQ_LO}

–

16

32

–

Receive

t_{RX_DIOVAL_VLD}

DIOVAL valid time – 32 chips/bit DDR

DIOVAL valid time – 32 chips/bit

–0.01

–

6.1

8.2

16.1

6.1

8.2

16.1

–

µs

DIOVAL valid time – 64 chips/bit

–

t_{RX_DIO_VLD}

t_{RX_IRQ_HI}

t_{RX_IRQ_LO}

DIO valid time – 32 chips/bit DDR

DIO valid time – 32 chips/bit

–

DIO valid time – 64 chips/bit

–

Minimum IRQ high time – 32 chips/bit DDR

Minimum IRQ high time – 32 chips/bit

Minimum IRQ high time – 64 chips/bit

Minimum IRQ low time – 32 chips/bit DDR

Minimum IRQ low Time – 32 chips/bit

Minimum IRQ Low Time – 64 chips/bit

1

–

1

–

1

–

8

–

16

32

–

Figure 12. DIO Receive Timing Diagram

t_{RX_IRQ _HI}

t_{RX_IRQ _LO}

IRQ

DIO /

data

DIO VAL

t_{RX_DIO _VLD}

t_{RX_DIO VAL_VLD}

Figure 13. DIO Transmit Timing Diagram

t_{TX_IRQ_HI}

t_{TX_IRQ_LO}

IRQ

DIO/

data

DIOVAL

t_{TX_DIO_SU}

t_{TX_DIOVAL_SU}

t_{TX_DIO_HLD}

t_{TX_DIOVAL_HLD}

Document Number : 38-16008 Rev. *G

Page 27 of 36

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Radio Parameters

Table 39. Radio Parameters

Parameter Description

RF frequency range

Conditions

Min

Typ

Max

Unit

Note 18

2.400

–

2.483

GHz

–3

Radio Receiver (T = 25°C, V = 3.3V, fosc = 13.000 MHz ± 2 ppm, X13OUT off, 64 chips/bit, Threshold Low = 8, Threshold High = 56, BER < 10

)

CC

Sensitivity

–86

–20

–

–95

–7

–

dBm

Maximum received signal

RSSI value for PWR_in> –40 dBm

RSSI value for PWR_in< –95 dBm

Receive ready^[19]

28–31

0–10

–

35

µs

Interference Performance

Co-channel interference rejection carrier-to-interference (C/I) C = –60 dBm

–

6

–

dB

Adjacent (1 MHz) channel selectivity C/I 1 MHz

Adjacent (2 MHz) channel selectivity C/I 2 MHz

Adjacent (> 3 MHz) channel selectivity C/I > 3 MHz

Image^[20]frequency interference, C/I Image

C = –60 dBm

C = –67 dBm

-5

–33

–45

–35

–41

Adjacent (1 MHz) interference to in-band image frequency, C/I C = –67 dBm

image ±1 MHz

Out-of-Band Blocking Interference Signal Frequency

30 MHz–2399 MHz except (FO/N & FO/N±1 MHz)^[21]

C = –67 dBm

–

–22

–21

–32

–

dBm

[21]

2498 MHz–12.75 GHz, except (FO*N & FO*N±1 MHz)

Intermodulation

C = –64 dBm

Δf = 5,10 MHz

Spurious Emission

–

30 MHz–1 GHz

–57

dBm

1 GHz–12.75 GHz except (4.8 GHz–5.0 GHz)

4.8 GHz–5.0 GHz

–54

–40 ^[22]

Radio Transmitter (T = 25°C, V = 3.3V, fosc = 13.000 MHz ± 2 ppm)

CC

Maximum RF transmit power

RF power control range

RF power range control step size

Frequency Deviation

Zero crossing error

PA = 7

–5

–

–0.4

28.6

4.1

–

dBm

dB

seven steps, monotonic

–

dB

PN Code Pattern 10101010

PN Code Pattern 11110000

–

270

320

±75

860

kHz

ns

–

Occupied bandwidth

100-kHz resolution

bandwidth, –6 dBc

500

kHz

Initial frequency offset

In-band Spurious

–

±50

–

kHz

Second channel power (±2 MHz)

> Third channel power (>3 MHz)

Non-Harmonically Related Spurs

30 MHz–12.75 GHz

–45

–52

–

–30

–40

–

dBm

–

–54

dBm

Harmonic Spurs

–

Second harmonic

–

–28

–25

–42

dBm

Third harmonic

–

Fourth and greater harmonics

–

Notes

18. Subject to regulation.

19. Max. time after receive enable and the synthesizer has settled before receiver is ready.

20. Image frequency is +4 MHz from desired channel (2 MHz low IF, high side injection).

21. FO = Tuned Frequency, N = Integer.

22. Antenna matching network and antenna will attenuate the output signal at these frequencies to meet regulatory requirements.

Document Number : 38-16008 Rev. *G

Page 28 of 36

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CYWUSB6935

Power Management Timing

[27]

Table 40. Power Management Timing (The values below are dependent upon oscillator network component selection)

Parameter

t_{PDN_X13}

t_{SPI_RDY}

t_{PWR_RST}

t_RST

Description

Time from PD deassert to X13OUT

Time from oscillator stable to start of SPI transactions

Power on to RESET deasserted

Conditions

Min

Typ

2000

–

Max

–

Unit

µs

ns

µs

–

1

1300

1

–

V_CCat 2.7V

–

Minimum RESET asserted pulse width

Power on to PD deasserted^[23]

PD deassert to clocks running^[24]

–

t_{PWR_PD}

t_WAKE

1300

–

2000

–

t_PD

Minimum PD asserted pulse width

PD assert to low power mode

PD deassert to IRQ^[25]assert (wake interrupt)^[26]

10

–

t_SLEEP

50

–

t_{WAKE_INT}

t_STABLE

t_STABLE2

–

2000

2100

–

PD deassert to clock stable

to within ±10 ppm

–

IRQ assert (wake interrupt) to clock stable

–

Figure 14. Power On Reset/Reset Timing

t_{SPI_RDY}

t_{PDN_X13}

X13OUT

VCC

t_{PW R_RST}

t_{PW R_PD}

t_RST

RESET

PD

Figure 15. Sleep / Wake Timing

t_WAKE

X13OUT

PD

t_PD

t_STABLE

t_STABLE2

t_SLEEP

t_{WAKE_INT}

IRQ

Notes

23. The PD pin must be asserted at power up to ensure proper crystal startup.

24. When X13OUT is enabled.

25. Both the polarity and the drive method of the IRQ pin are programmable. See page 11 for more details. Figure 15 illustrates default values for the Configuration register

(Reg 0x05, bits 1:0).

26. A wakeup event is triggered when the PD pin is deasserted. Figure 15 illustrates a wakeup event configured to trigger an IRQ pin event via the Wake Enable register

(Reg 0x1C, bit 0=1).

27. Measured with CTS ATXN6077A crystal.

Document Number : 38-16008 Rev. *G

Page 29 of 36

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Typical Operating Characteristics

ReceiverSensitivity

2.440GHz, 3.3v

BER Sensitivityvs Temp

GUID: 0x0ECC7E75

-86

-88

-90

-92

-94

-96

-98

-100

-93.5

-94.0

-94.5

-95.0

-95.5

-96.0

-96.5

-97.0

-97.5

-98.0

Spec Min

Spec Typ

Temp Spec

Typical

3.3

3.7

2.6

-50

0

50

100

-50

-30

-10

10

30

50

70

90

Temperature (°C)

Temp (degC)

BER Sensitivity vs Temp @2.6v

BERSensitivityvsTemp@3.3v

-92.5

-93.0

-93.5

-94.0

-94.5

-95.0

-95.5

-96.0

-96.5

-94.0

-94.5

-95.0

-95.5

-96.0

-96.5

-97.0

-97.5

LR06 0x0ECC7E75

LR07 0x17D34AAD

LR14 0x0DD2E9F8

LR06 0x0ECC7E75

LR07 0x17D34AAD

LR14 0x0DD2E9F8

-50

-30

-10

10

30

50

70

90

-50

-30

-10

10

30

50

70

90

Temperature (°C)

BERSensitivityvsTemp@3.7v

BERSensitivityvsVcc@-45°C

-94.5

-95.0

-95.5

-96.0

-96.5

-97.0

-97.5

-98.0

-95.0

LR06 0x0ECC7E75

LR07 0x17D34AAD

LR14 0x0DD2E9F8

LR06 0x0ECC7E75

LR07 0x17D34AAD

LR14 0x0DD2E9F8

-95.5

-96.0

-96.5

-97.0

-97.5

-98.0

-50

-30

-10

10

30

50

70

90

2.5

2.7

2.9

3.1

3.3

3.5

3.7

3.9

Temperature (°C)

Vcc

Document Number : 38-16008 Rev. *G

Page 30 of 36

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CYWUSB6935

BERSensitivityvsVcc@90°C

BERSensitivity vs Vcc@25°C

-94.0

-94.5

-95.0

-95.5

-96.0

-96.5

-93.0

-93.5

-94.0

-94.5

-95.0

-95.5

LR06 0x0ECC7E75

LR07 0x17D34AAD

LR14 0x0DD2E9F8

LR06 0x0ECC7E75

LR07 0x17D34AAD

LR14 0x0DD2E9F8

2.5

2.7

2.9

3.1

3.3

3.5

3.7

3.9

2.5

2.7

2.9

3.1

3.3

3.5

3.7

3.9

Vcc

Maximum Transmit Output Power

2.440GHz, 3.3v

Tx Ch40 Output Power

LR18 0x17D34E2D

0

-1

-2

-3

-4

-5

-6

0.4

0.2

0

Spec Min

Spec Typ

Temp Spec

Average

2.6

-0.2

-0.4

-0.6

-0.8

-1

3.3

3.7

-50

-30

-10

10

30

50

70

90

-60

-40

-20

0

20

40

60

80

100

Temp (degC)

Tx Ch40 Output Power

LR20 0xDD2E6A8

Tx Ch0 Output Power

LR21 0xECC7E71

0

-0.2

-0.4

-0.6

-0.8

-1

0

-1

-2

-3

-4

-5

-6

2.6

3.3

3.7

2.6

3.3

3.7

Spec Min

Spec Typ

Temp Spec

-1.2

-1.4

-1.6

-1.8

-50

-30

-10

10

30

50

70

90

-60

-40

-20

0

20

40

60

80

100

Temp (degC)

Document Number : 38-16008 Rev. *G

Page 31 of 36

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CYWUSB6935

Figure 16. AC Test Loads and Waveforms for Digital Pins

AC Test Loads

OUTPUT

DC Test Load

OUTPUT

R1

V

CC

5 pF

30 pF

OUTPUT

INCLUDING

JIG AND

SCOPE

INCLUDING

JIG AND

SCOPE

R2

Max

Typical

ALL INPUT PULSES

V

Parameter

R1

Unit

CC

90%

10%

90%

10%

1071

937

500

1.4

Ω

V

GND

R2

Fall time: 1 V/ns

R_TH

Rise time: 1 V/ns

V_TH

THÉ

VENIN EQUIVALENT

Equivalent to:

OUTPUT

V_CC

3.00

R

TH

V

TH

Ordering Information

Part Number

Radio

Package Name

Package Type

Operating Range

CYWUSB6935-48LTXI

CYWUSB6935-48LTXC

Transceiver 48-pin QFN (Sawn) 48-pin QFN (Pb-free)

Industrial

Commercial

Ordering Code Definition

C/I

6935 48-LTX

CY

WUSB

Temperature range:

Commercial/Industrial

48-pin Sawn QFN package

X = Pb-free

Part Number

Marketing Code: Wireless USB family

Company ID: CY = Cypress

Document Number : 38-16008 Rev. *G

Page 32 of 36

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CYWUSB6935

Package Diagram

Figure 17. 48-pin QFN 7 × 7 × 1.0 mm LT48C (Sawn)

001-53698 *A

Document Number : 38-16008 Rev. *G

Page 33 of 36

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CYWUSB6935

Acronyms

Document Conventions

Table 41. Acronyms Used in this Document

Table 42. Units of Measure

Symbol

Unit of Measure

Acronym

BER

Description

°C

degree Celsius

decibels

Bit error rate

dB

CMOS

CRC

FEC

FER

GFSK

HBM

ISM

Complementary metal oxide semiconductor

Cyclic redundancy check

Forward error correction

Frame error rate

dBc

dBm

Hz

decibel relative to carrier

decibel-milliwatt

hertz

KB

1024 bytes

1024 bits

Gaussian frequency-shift keying

Human body model

Kbit

kHz

kΩ

kilohertz

Industrial, scientific, amd medical

Interrupt request

kilohm

IRQ

MHz

MΩ

μA

megahertz

MCU

NRZ

PLL

Microcontroller unit

megaohm

Non return to zero

microampere

microsecond

microvolts

Phase locked loop

μs

QFN

RSSI

RF

Quad flat no-leads

μV

μVrms

μW

mA

ms

mV

nA

microvolts root-mean-square

microwatts

Received signal strength indication

Radio frequency

milliampere

millisecond

millivolts

Rx

Receive

Tx

Transmit

nanoampere

nanosecond

nanovolts

ns

nV

Ω

ohm

pp

peak-to-peak

parts per million

picosecond

samples per second

volts

ppm

ps

sps

V

Document Number : 38-16008 Rev. *G

Page 34 of 36

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CYWUSB6935

Document History Page

Document Title: CYWUSB6935 WirelessUSB^TMLR 2.4 GHz DSSS Radio SoC

Document Number: 38-16008

Orig. of Submission

Revision

ECN

Description of Change

Change

Date

**

207428

275349

TGE

02/27/04 New datasheet

*A

ZTK

See ECN Updated REG_DATA_RATE (0x04), 111 - Not Valid

Changed AVCC annotation to VCC

Removed SOIC package option

Corrected Logic Block Diagram – CYWUSB6935, Figure 7 and Figure 8

Updated ordering information section

Added Table 1 Internal PA Output Power Step Table

Corrected Figure 17 caption

Updated Radio Parameters

Added commercial temperature operating range in section 10

Updated average transmitter current consumption number

*B

*C

291015

335774

ZTK

TGE

See ECN Added t_STABLE2parameter to Table 40 and Figure 15

Removed Addr 0x01 and 0x02–unused

See ECN Corrected Figure 7 - swap RFIN / RFOUT

Corrected REG_CONTROL - bit 1 description

Added Section 12.3 - Typical Operating Characteristics

*D

*E

391311

TGE

DPT

See ECN Added receive ready parameter to Table 39

2770967

09/29/09 Added 48QFN package diagram (Sawn)

Saw Marketing part number in ordering information.

*F

2897889

3048368

TGE

03/23/10 Removed inactive parts from Ordering Information.

Updated Packaging Information

*G

HEMP

10/05/2010 Sunset review; no technical updates.

Format updates per template.

Document Number : 38-16008 Rev. *G

Page 35 of 36

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CYWUSB6935

Sales, Solutions, and Legal Information

Worldwide Sales and Design Support

Cypress maintains a worldwide network of offices, solution centers, manufacturer’s representatives, and distributors. To find the office

closest to you, visit us at Cypress Locations.

Products

PSoC Solutions

Automotive

cypress.com/go/automotive

cypress.com/go/clocks

cypress.com/go/interface

cypress.com/go/powerpsoc

cypress.com/go/plc

psoc.cypress.com/solutions

PSoC 1 | PSoC 3 | PSoC 5

Clocks & Buffers

Interface

Lighting & Power Control

Memory

cypress.com/go/memory

cypress.com/go/image

cypress.com/go/psoc

Optical & Image Sensing

PSoC

Touch Sensing

USB Controllers

Wireless/RF

cypress.com/go/touch

cypress.com/go/USB

cypress.com/go/wireless

any circuitry other than circuitry embodied in a Cypress product. Nor does it convey or imply any license under patent or other rights. Cypress products are not warranted nor intended to be used for

medical, life support, life saving, critical control or safety applications, unless pursuant to an express written agreement with Cypress. Furthermore, Cypress does not authorize its products for use as

critical components in life-support systems where a malfunction or failure may reasonably be expected to result in significant injury to the user. The inclusion of Cypress products in life-support systems

application implies that the manufacturer assumes all risk of such use and in doing so indemnifies Cypress against all charges.

Any Source Code (software and/or firmware) is owned by Cypress Semiconductor Corporation (Cypress) and is protected by and subject to worldwide patent protection (United States and foreign),

United States copyright laws and international treaty provisions. Cypress hereby grants to licensee a personal, non-exclusive, non-transferable license to copy, use, modify, create derivative works of,

and compile the Cypress Source Code and derivative works for the sole purpose of creating custom software and or firmware in support of licensee product to be used only in conjunction with a Cypress

integrated circuit as specified in the applicable agreement. Any reproduction, modification, translation, compilation, or representation of this Source Code except as specified above is prohibited without

the express written permission of Cypress.

Disclaimer: CYPRESS MAKES NO WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, WITH REGARD TO THIS MATERIAL, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES

OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. Cypress reserves the right to make changes without further notice to the materials described herein. Cypress does not

assume any liability arising out of the application or use of any product or circuit described herein. Cypress does not authorize its products for use as critical components in life-support systems where

a malfunction or failure may reasonably be expected to result in significant injury to the user. The inclusion of Cypress’ product in a life-support systems application implies that the manufacturer

assumes all risk of such use and in doing so indemnifies Cypress against all charges.

Use may be limited by and subject to the applicable Cypress software license agreement.

Document Number : 38-16008 Rev. *G

Revised October 05, 2010

Page 36 of 36

All products and company names mentioned in this document may be the trademarks of their respective holders.

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