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RX-4702CF

型号:

RX-4702CF

品牌:

SEIKO[ SEIKO EPSON CORPORATION ]

页数:

19 页

PDF大小:

220 K

MQ392-01  
Application Manual  
Real Time Clock Module  
RX-4702CF  
Model  
Product Number  
RX-4702CF  
Q414702A0000100  
In pursuit of "Saving" Technology ,Epson electronic device.  
Our Lineup of semiconductors, Liquid crystal displays and quartz devices  
assists in creating the products of our customers' dreams.  
Epson IS energy savings.  
NOTICE  
• The material is subject to change without notice.  
• Any part of this material may not be reproduced or duplicated in any form or any means without the  
written permission of Seiko Epson.  
• The information, applied circuit, program, using way etc., written in this material is just for reference.  
Seiko Epson does not assume any liability for the occurrence of infringing any patent or copyright of third  
party. This material does not authorize the licence for any patent or intellectual property rights.  
• Any product described in this material may contain technology or the subject relating to strategic  
products under the control of the Foreign Exchange and Foreign Trade Law of Japan and may require an  
export licence from the Ministry of International Trade and industry or other approval from another  
government agency.  
• The products (except for some product for automotive applications) listed up on this material are designed  
to be used with ordinary electronic equipment (OA equipment, AV equipment, communications equipment,  
measuring instruments etc). Seiko Epson does not assume any liability for the case using the products with  
the appoication required high reliability or safety extremely (such as aerospace equipment etc).  
When intending to use any our product with automotive application and the other application than  
ordinary electronic equipments as above, please contact our sales representatives in advance.  
RX - 4702 CF  
CONTENTS  
1. Overview.................................................................................................................. 1  
2. Block diagram........................................................................................................ 1  
3. Terminal description............................................................................................ 2  
3.1. Terminal connections.............................................................................................................. 2  
3.2. Terminal functions ................................................................................................................... 2  
4. Absolute maximum ratings................................................................................ 3  
5. Recommended operating conditions ............................................................ 3  
6. Frequency characteristics................................................................................. 3  
7. Electrical characteristics.................................................................................... 3  
7.1. DC electrical characteristics ................................................................................................. 3  
7.2. Temperature sensor characteristics................................................................................... 4  
7.3. AC electrical characteristics.................................................................................................. 5  
8. How to use.............................................................................................................. 6  
8.1. Register table............................................................................................................................ 6  
8.2. Register description................................................................................................................. 7  
8.2.1. Clock and calendar registers ( Reg-0 to Reg-6 )............................................................... 7  
8.2.2. Alarm registers ( Reg-7 to Reg-A ).................................................................................. 7  
8.2.3. Additional counter ( Reg-B,C )........................................................................................... 8  
8.2.4. Control register 3 ( Reg-D ) ............................................................................................... 8  
8.2.5. Control register 3 ( Reg-D ) ............................................................................................... 9  
8.2.6. Control register 2 ( Reg-F )................................................................................................ 9  
8.3. Read/write of data.................................................................................................................. 10  
8.4. Alarm interrupt......................................................................................................................... 11  
8.5. FOE start function.................................................................................................................. 12  
8.6. Power Down / power Up Timing........................................................................................ 12  
8.7. External connection example............................................................................................. 12  
9. External dimensions / Marking layout......................................................... 13  
9.1. External dimensions.............................................................................................................. 13  
9.2. Marking layout......................................................................................................................... 13  
10. Reference data................................................................................................. 14  
11. Application notes.............................................................................................. 15  
RX - 4702 CF  
Serial RTC module with alarm and timer function  
RX - 4702 CF  
Built-in 32.768 kHz crystal oscillator with frequency adjusted  
Alarm interrupt function for day of week, day, hour, and minute  
Timer interrupt function which can be set up between 1/4096 second and 255 minutes  
OVF interrupt function based on 12-bit additional counter  
Ability to detect stopping of oscillation and time update  
Automatic adjustment for leap year  
Built-in temperature sensor ( voltage output : 7.8 mV / °C Typ.)  
Wide range of interface voltage between 1.6 V and 5.5 V  
Wide range of clock voltage between 1.6 V and 5.5 V  
Low power consumption at 0.5 µA / 3 V ( Typ.)  
Available as small package ( CF : SON-10 pin PKG.)  
1. Overview  
This module is a serial interface real time clock that has a built-in crystal oscillator. The module offers  
many functions such as clock & calendar circuitry with automatic leap year adjustment (from seconds to  
year), additional counter, alarm, and time update. In addition, it is equipped with a diode temperature  
sensor (analog voltage output).  
The serial interface can be controlled by three signal lines, and it saves the port which a system uses  
most. Because it is available in small package SON in high density mounting, it is ideally suited for  
applications such as mobile phones, handy terminals or other small electronic systems.  
2. Block diagram  
32.768 kHz  
OSC  
Control Line  
DIVIDER  
CLOCK  
and  
VTEMP  
/ SOFF  
Temperature  
Sensor  
CALENDAR  
ADDITIONAL  
COUNTER  
REGISTER  
FOUT  
FOE  
FOUT  
CONTROLLER  
INTERRUPTS  
CONTROLLER  
ALARM  
/ IRQ  
REGISTER  
DATA  
CLK  
CE  
CONTROL  
REGISTER  
BUS  
and  
INTERFACE  
CIRCUIT  
SYSTEM  
CONTROLLER  
Page - 1  
MQ - 392 - 01  
RX - 4702 CF  
3. Terminal description  
3.1. Terminal connections  
RX - 4702 CF  
1. CE  
10. VDD  
9. VTEMP  
8. / IRQ  
7. FOE  
# 1  
# 10  
2. CLK  
3. DATA  
4. / SOFF  
5. GND  
# 5  
# 6  
6. FOUT  
SON - 10pin  
3.2. Terminal functions  
Signal  
I / O  
Signal description  
name  
This is a chip enabled input pin with the builit-in pull-down resistor.  
When the CE pin is "H" level, access to this RTC is possible.  
When the CE pin is at the "L" level, the DATA pin is at the high impedance level and  
the CLK and DATA pins cannot accept input.  
CE  
Input  
Input  
This is a shift clock input pin for serial data transmission. In the write mode, it takes in  
data from the DATA pin using the CLK signal rise edge. In the read mode, it outputs  
data from the DATA pin using the fall edge.  
CLK  
This is a data input/output pin for serial data transmission. After the input rise of CE, by  
using the first 8-bit write data to set the write or read mode, this pin can be set as either  
input pin or output pin.  
DATA  
FOUT  
Bi-directional  
Output  
This pin outputs the clock signal of frequency. (32.768 kHz CMOS output). Depending  
on the FOE input pin, output from the FOUT pin can be prohibited.  
This is the input pin for the FOUT output control. When the FOE pin is at the "H" level,  
the FOUT pin goes into the output state; when it is at the "L" level, the FOUT pin is at  
the high impedance level.  
FOE  
Input  
VTEMP  
Output  
This is the voltage output pin for the temperature sensor (analog).  
This is the input pin for the temperature sensor control. When the /SOFF pin is at the  
"H" level and the SON bit is 1, the temperature sensor circuitry starts and outputs a  
voltage according to the temperature of the VTEMP pin. When the /SOFF pin is at the  
"L" level, the temperature sensor circuitry stops and the VTEMP pin is at the high  
impedance level.  
/ SOFF  
Input  
/ IRQ  
VDD  
Output  
This is an open drain output pin for alarm and additional counter interrupt.  
This pin connects to the plus side of the power.  
GND  
This pin connects to the minus side (ground) of the power.  
This pin is not connected internally.  
Use OPEN, or GND or VDD to connect.  
N.C.  
* Be sure to connect a filter capacity of at least 0.1 µF close to VDD GND.  
Page - 2  
MQ - 392 - 01  
RX - 4702 CF  
4. Absolute maximum ratings  
GND=0 V  
Parameter  
Symbol  
Condition  
Rating  
Unit  
Power voltage  
Input voltage  
Output voltage 1  
Output voltage 2  
VDD  
VIN  
to +7.0  
to VDD+0.3  
to +8.0  
V
V
V
0.3  
GND0.3  
GND0.3  
input pin  
/ IRQ pin  
VOUT1  
VOUT2  
TSTG  
FOUT, DATA pins  
to VDD+0.3  
V
GND0.3  
55  
Stored bare product after unpacking  
Storage temperature  
to +125  
°C  
5. Recommended operating conditions  
GND=0 V  
Parameter  
Symbol  
Condition  
Rating  
Unit  
Power voltage  
Clock voltage  
Operating temperature  
VDD  
VCLK  
TOPR  
1.6 to 5.5  
1.6 to 5.5  
to +85  
40  
V
V
°C  
No condensation  
6. Frequency characteristics  
GND=0 V  
Parameter  
Symbol  
Condition  
Rating  
5 ± 23  
± 2 Max.  
Unit  
f / f  
f / V  
Ta= +25 °C, VDD=3.0 V  
Ta= +25 °C, VDD=1.6 V to 5.5 V  
Ta= 20 °C to +70 °C,  
× 106  
( 1) ( 2)  
Frequency precision  
Oscillation start time  
Frequency temperature  
characteristics  
× 106 / V  
Top  
+10 / 120  
× 106  
VDD= 3.0 V ; Reference at +25 °C  
Frequency voltage  
characteristics  
Aging  
tSTA  
3 Max.  
s
Ta= +25 °C, VDD=3.0 V  
fa  
Ta= +25 °C, VDD=3.0 V ; first year  
± 5 Max.  
× 106 / year  
1 ) This difference is 1 minute by 1 month. ( excluding offset )  
2 ) Also,This precision includes shift of frequency by the solder handling of reflow.  
7. Electrical characteristics  
If not specifically indicated, GND=0 V, VDD=1.6 V to 5.5 V  
7.1. DC electrical characteristics  
, Ta= 40 °C to +85 °C  
Parameter  
Symbol  
Condition  
Min.  
Typ.  
Max.  
Unit  
Current  
consumption (1)  
Current  
consumption (2)  
Current  
consumption (3)  
Current  
consumption (4)  
Current  
consumption (5)  
Current  
consumption (6)  
Current  
consumption (7)  
Current  
CE, FOE, /SOFF = GND  
/IRQ = VDD  
32.768 kHz output is OFF  
Sensor output is OFF  
IDD1  
VDD=5 V  
VDD=3 V  
0.8  
1.6  
µA  
IDD2  
IDD3  
IDD4  
IDD5  
IDD6  
IDD7  
IDD8  
0.5  
3.0  
1.7  
8.0  
5.0  
50  
1.0  
7.5  
4.5  
20.0  
12.0  
75  
µA  
µA  
µA  
µA  
µA  
µA  
µA  
VDD=5 V,  
CL= 0 pF  
VDD=3 V,  
CE, /SOFF = GND  
CL= 0 pF FOE, / IRQ = VDD  
32.768 kHz output is ON  
Sensor output is OFF  
VDD=5 V,  
CL=30 pF  
VDD=3 V,  
CL=30 pF  
CE, FOE, = GND  
VDD=5 V  
VDD=3 V  
Input pin  
/SOFF, / IRQ = VDD  
32.768 kHz output is OFF  
Sensor output is ON  
40  
60  
consumption (8)  
VIH  
VIL  
0.8VDD  
GND0.3  
VDD+0.3  
0.2VDD  
V
V
Input voltage  
Input  
leakage current  
ILK  
Input Pin except CE, VIN= VDD or GND  
0.5  
0.5  
µA  
Input resistance (1)  
RDWN1  
RDWN2  
VOH1  
VOH2  
VOH3  
VOL1  
VOL2  
VOL3  
VOL4  
VOL5  
VDD=5 V  
VDD=3 V  
75  
150  
4.5  
2.0  
150  
300  
300  
600  
5.0  
3.0  
3.0  
CE pin  
VIN=VDD  
kΩ  
kΩ  
V
V
V
V
V
V
V
Input resistance (2)  
Output voltage (1)  
VDD=5 V, IOH=1 mA  
VDD=3 V, IOH=1 mA  
VDD=3 V, IOH=100 µA  
VDD=5 V, IOL= 1 mA  
VDD=3 V, IOL= 1 mA  
VDD=3 V, IOL= 100 µA  
VDD=5 V, IOL= 1 mA  
VDD=3 V, IOL= 1 mA  
DATA ,  
FOUT pins  
2.9  
GND  
GND  
GND  
GND  
GND  
GND+0.5  
GND+0.8  
GND+0.1  
GND+0.25  
GND+0.4  
DATA ,  
FOUT pins  
Output voltage (2)  
/ IRQ pin  
V
Output  
leakage current  
Output pins other than VTEMP  
VOUT= VDD or GND  
IOZ  
0.5  
0.5  
µA  
Page - 3  
MQ - 392 - 01  
RX - 4702 CF  
If not specifically indicated, GND=0 V, VDD=2.7 V to 5.5 V  
7.2. Temperature sensor characteristics  
, Ta= 40 °C to +85 °C  
Parameter Symbol  
Condition  
Min.  
Typ.  
Max.  
Unit  
Temperature  
output voltage  
Output precision TACR  
Temperature  
sensitivity ( 1)  
VTEMP pin, Ta=+25 °C  
GND based output voltage  
Ta=+25 °C  
VTEMP  
1.480  
V
°C  
± 5.0  
8.3  
VSE  
40 °C Ta +85 °C  
40 °C Ta +85 °C  
NL ≤ ±2.0 %  
7.3  
40  
7.8  
mV / °C  
%
Linearity ( 2)  
Temperature  
detection range  
Output  
NL  
± 2.0  
+ 85  
TSOP  
°C  
VTEMP pin, Ta=+25 °C  
GND standard and VDD standard  
RO  
1.0  
3.0  
kΩ  
resistance ( 3)  
CL  
RL  
100  
pF  
kΩ  
Load condition  
500  
VDD= 3.0 V , CL=100 pF , RL=500 k,  
within ±1 °C  
Response time  
tRSP  
200  
µs  
1) Temperature sensitivity  
2) Linearity  
VSE = ( V (+85 °C) V (40 °C) ) / 125 [ mV / °C ]  
a : Maximum deviation between the measured value of  
VTEMP and the approximate straight line  
a
b
NL =  
× 100 [%]  
b : Difference between the measured values at -40 °C and  
+85 °C  
VTEMP  
a
[ V ]  
V (40 °C )  
a
Approximate  
straight line  
b
Output  
voltage  
Measured value  
a
V(+85 °C )  
Ta  
0
+85  
40  
[°C]  
Temperature  
V1  
∆ Ι1  
3) Output resistance ( Ro )  
Ro =  
RTC  
OP.AMP.  
VTEMP  
1 MΩ  
Ι1  
V1  
Page - 4  
MQ - 392 - 01  
RX - 4702 CF  
7.3. AC electrical characteristics  
Parameter  
If not specifically indicated, GND=0 V, Ta= 40 °C to +85 °C  
VDD=3 V ± 10 % VDD=5 V ± 10 %  
Symbol Condition  
Unit  
Min. Typ. Max. Min. Typ. Max.  
tCLK  
tWH  
tWL  
tCS  
tCH  
tCR  
tDS  
tDH  
tWZ  
tDO  
tRD  
CLK clock cycle  
600  
300  
300  
300  
300  
400  
75  
350  
175  
175  
175  
175  
300  
50  
ns  
ns  
ns  
ns  
ns  
ns  
ns  
ns  
ns  
ns  
ns  
CLK H pulse width  
CLK L pulse width  
CE setup time  
CE hold time  
CE recovery time  
Write data setup time  
Write data hold time  
Write data disable time  
Output mode switching time  
Read data delay time  
75  
50  
0
0
0
0
CL=50 pF  
CL=50 pF  
RL=10 kΩ  
300  
200  
120  
100  
tRZ  
Output disable time  
ns  
tRF  
Input rise/fall time  
FOUT duty  
100  
60  
50  
60  
ns  
%
40  
40  
tW / t  
50% VDD level  
Timing chart  
50  
%
C E  
t
tCH  
t
CR  
RF  
t CS  
t WH tWL  
t RF  
90 %  
CLK  
10 %  
t DS  
t
DH  
Data Write  
DATA  
D 0  
D 1  
D 6  
D 7  
D 0  
D 6  
D 7  
(Setup code, setup address)  
(Write data)  
t DO  
Data Read  
t
RZ  
t
WZ  
D 7  
%
%
90  
10  
DATA  
D 0  
D 1  
D 6  
D 0  
tRD  
D 6  
D 7  
(Read data)  
Starting from here the DATA pin goes into the  
output mode.  
(Setup code, setup address)  
Page - 5  
MQ - 392 - 01  
RX - 4702 CF  
8. How to use  
8.1. Register table  
Address  
Function  
bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0  
note  
0
1
2
3
4
5
6
7
8
9
A
B
C
D
E
F
fos  
fr  
40  
40  
¡
20  
20  
20  
5
10  
10  
10  
4
8
8
8
3
8
8
8
8
8
3
8
8
4
4
4
2
4
4
4
4
4
2
4
4
2
2
1
1
second  
minute  
3
fr  
2
1
hour  
3, 5  
3
fr  
6
1
0
day of week  
day  
¡
fr  
20  
¡
10  
10  
10  
10  
10  
4
2
1
3, 5  
3, 5  
fr  
2
1
month  
C
40  
40  
80  
AE  
AE  
AE  
AE  
128  
fr  
20  
20  
20  
5
2
1
year  
2
1
minute alarm  
hour alarm  
day of week alarm  
day alarm  
additional counter 1  
additional counter 2  
control 3  
2
1
6
6
1
0
20  
32  
AC0  
¡
10  
16  
2
1
6
64  
AC1  
2
1
OVF 2048 1024  
512  
256  
3, 4  
¡
¡
FOES TEST1  
ACIE ACE SON  
2, 5, 7  
4, 5  
¡
¡
¡
¡
¡
¡
AF  
AIE  
control 1  
¡
¡
¡
¡
TEST0 STOP RESET HOLD  
control 2  
2, 5, 7  
Note  
1 )  
When after the initial power-up or when the result of read out the fos bit is "1" , initialize all registers, before  
using the module.  
Be sure to avoid entering incorrect date and time data, as clock operations are not guaranteed when the data or  
time data is incorrect.  
Access is specified by the first 4 bits in the serial communication.  
Setting  
Mode  
Code  
Write  
Read  
3 h  
C h  
At the initial power supply, the FOES, ACE, SON and TEST0, TEST1 bits are reset to 0. For the other bits,  
because their register values are not fixed, be sure to initialize them before use. During the initialization, do not  
use data other than date and time; otherwise there is no guarantee that the clock will operate.  
2 )  
The ‘fr' bits are read only bit and cannot be written.  
3 )  
4 )  
5 )  
6 )  
7 )  
Only the write "0" is possible to AF and OVF.  
Don't write "1" at an initial value of " ¡ " bit as "0" afterwards.  
The "" bits are read/write bits as same as memory.  
The TEST0 and TEST1 bits are reserved for testing work by EPSON. Be sure to set "0" for this bit.  
Page - 6  
MQ - 392 - 01  
RX - 4702 CF  
8.2. Register description  
8.2.1. Clock and calendar registers ( Reg-0 to Reg-6 )  
Data is in the BCD format. For example, if the second register is "0101 1001", this means 59 seconds. The time  
measurement uses the 24-hour format (fixed).  
If the alarm interrupt is not used, registers 7 to A can be used as 7-bit memory register. In this case, be sure to set  
the AIE(Alarm Interrupt Enable) bit to 0 and forbid use of the alarm interrupt.  
If the Timer interrupt is not used, register D can be used as an 8-bit memory register. In this case, be sure to set the  
TIE (Timer Interrupt Enable) bit to 0 and forbid use of the Timer interrupt.  
Year register and leap year, and year-digit carry bits  
If the year register's 2-digit BCD is divided by four and the remainder is 0, this year is determined as the  
leap year. This works automatically for both the Western calendar as well as the Japanese Heisei calendar.  
(Year 00 is taken as a leap year.)  
Also, for the year register, 99 is followed by 00. At this time, the year-digit carry bit C (bit 6 of register 5) is  
set to 1.  
· Day of week register  
The day of week register makes use of the 7 bits from 0 to 6. The bits are assigned as shown in the  
following table. Be sure not to set multiple days of week to 1.  
bit 6  
bit 5  
bit 4  
bit 3  
bit 2  
bit 1  
bit 0  
Day of week  
0
0
0
0
0
0
1
0
0
0
0
0
1
0
0
0
0
0
1
0
0
0
0
0
1
0
0
0
0
0
1
0
0
0
0
0
1
0
0
0
0
0
1
0
0
0
0
0
0
Sunday  
Monday  
Tuesday  
Wednesday  
Thursday  
Friday  
Saturday  
fos ( OSC Flag )  
This flag is a bit for recording when the oscillation stops. This bit is used to detect when decrease in the  
power voltage causes the oscillation to stop. 1 indicates oscillation has stopped and this information is kept  
until 0 is written to it. This flag is not affected even when other bits (STOP, RESET) are 1.  
fr ( READ Flag )  
This flag is a bit which becomes 0 when the RTC is set to the non-selection state (CE input pin becomes  
"L"), or 1 when the RTC is set to the selection state (CE becomes "H") during which there is a 1 second  
digit increase. Because of this characteristic, it becomes possible to determine whether a 1 second digit  
increase has occurred during read-out of the clock register. If fr is 1, it becomes necessary to read all the  
clock registers again.  
C ( Year-digit Carry bit in register5.)  
When the year register advances from 99 to 00, if 0 is written to the value before the advance in year, this  
bit is set to 1. Even thought the year register of this RTC uses the lower 2 digits of the Western calendar, by  
looking at the year-digit carry bit, it becomes possible to handle the upper two digits of the Western  
calendar also.  
For example, the year-digit carry bit can be used to handle the four-digit year value in a way so that if it is 0,  
the upper two digits are considered as 19, or if it is 1 the upper two digits are considered as 20.  
8.2.2. Alarm registers ( Reg-7 to Reg-A )  
Alarm can be set to day of week, day, hour, or minute. Each of the respective alarm register has the AE bit (Alarm  
Enable bit) attached to bit 7. By taking advantage of this bit, the hourly alarm and daily alarm can easily be set up.  
The day of week alarm can be set to any multiple days of the week. When the AE bit is 0, the appropriate register  
and the clock register are compared; when the bit is 1, this means "don't care" and the data is ignored and the two  
are regarded as the same. When the alarm goes off, the AF (Alarm Flag) bit is set to 1; if at this moment the AIE  
(Alarm Interrupt Enable) bit is 1, the /IRQ pin is set to the low level and the interrupt signal occurs. If the AIE bit is 0,  
the alarm interrupt output from the /IRQ pin will be prohibited.  
The relationship between the day of week alarm bit and each day of the week is shown as follows:  
bit  
bit 6  
bit 5  
bit 4  
bit 3  
bit 2  
bit 1  
bit 0  
Wednesday  
Day of week Saturday  
Friday  
Thursday  
Tuesday  
Monday  
Sunday  
Page - 7  
MQ - 392 - 01  
RX - 4702 CF  
8.2.3. Additional counter ( Reg-B,C )  
Address  
bit 7  
bit 6  
bit 5  
bit 4  
bit 3  
bit 2  
bit 1  
bit 0  
B
C
128  
fr  
64  
AC1  
32  
AC0  
16  
OVF  
8
4
2
512  
1
256  
2048  
1024  
This is a 12-bit presettable count-up counter. After the initial value is set, when the ACE (Additional Counter Enable)  
bit of control register 3 is set to 1, at the timing of the source clock selected at the AC0 and AC1 bits of Reg-C,  
count-up continues as long as the ACE bit is 1.  
When the above Additional counter overflows (FFFh -> 000h), the OVF bit becomes 1. At this moment, if the ACIE  
(Additional Counter Interrupt Enable) bit of control register 3 has been set to 1, it is possible to trigger the additional  
counter overflow interrupt at the /IRQ pin. As long as the count-up operation is not stopped by the register  
operation, the clock operation continues even if the RTC is in the non-selection state (during backup), and interrupt  
from this state can happen.  
During data read of the additional counter, if the fr flag is 1, this indicates the counter has been updated during the  
read operation; therefore it is necessary to read the counter data again. Also, if 16 Hz is selected for the source  
clock, because the update timing cannot be caught at the fr flag when the counter is operating, an update check  
with data read at 2 times is required. However, while the counter is stopping, such data read at 2 times is not  
required.  
By using the additional counter function, time lapse measurement, various cooking Timer operations of interrupt  
after n minutes, and long Timer can be made possible.  
When you set data to this counter, set data to register B first.Set data to register C next.Set data to both register by  
all means.  
additional counter and source clock selection  
AC1  
AC0  
Source clock  
Possible count range  
0
0
1
1
0
1
0
1
16 Hz  
0
0
0
0
to 255.93 seconds  
to 4095 seconds  
to 4095 minutes  
to 4095 hours  
Update in seconds  
Update in minutes  
Update in hours  
8.2.4. Control register 3 ( Reg-D )  
Address  
D
bit 7  
bit 6  
bit 5  
¡
bit 4  
¡
bit 3  
¡
bit 2  
bit 1  
ACE  
bit 0  
FOES  
TEST1  
ACIE  
SON  
TEST1 bit : this bit is reserved for testing work by EPSON.  
Be sure to always set this bit to 0. Be careful not to set this bit to 1 accidentally when writing to other bits of  
Reg-D. It can be cleared by setting the CE pin to "L".  
FOES bit ( FOE Start Mode )  
When this bit is set to 1, the additional counter will not start at the time 1 is written to the ACE( Additional  
Counter Enable) bit of control register 3. With the ACE bit in 1, when the FOE input pin changes from the  
"H" level to the "L" level (fall edge), the additional counter will start.  
When the FOES bit is set to 0, the additional counter will start at the time the 1 is written to the  
ACE( Additional Counter Enable) bit of control register 3. When the power is supplied initially, this bit is  
reset to 0.  
ACIE bit ( Additional Counter Interrupt Enable )  
This bit determines whether the interrupt signal should be generated from the /IRQ pin when the overflow  
interrupt event of the additional counter occurs. When the ACIE bit is 1, the interrupt signal is generated.  
ACE bit ( Additional Counter Enable )  
When this bit is set to 1, the additional counter starts the count-up. When this bit is set to 0, the additional  
counter stops the count-up. When the power is supplied initially, this bit is reset to 0.  
SON bit ( Sensor ON )  
When this bit is 1 and, furthermore, the /SOFF pin is at the "H" level, the builit-in temperature sensor  
circuitry starts and the analog voltage is output from the VTEMP pin according to the temperature. When  
this bit is 0, the temperature sensor circuitry stops and the VTEMP pin is at the high impedance level. When  
the power is supplied initially, this bit is reset to 0.  
Page - 8  
MQ - 392 - 01  
RX - 4702 CF  
8.2.5. Control register 3 ( Reg-D )  
Address  
E
bit 7  
¡
bit 6  
¡
bit 5  
¡
bit 4  
¡
bit 3  
AF  
bit 2  
¡
bit 1  
AIE  
bit 0  
¡
AF bit ( Alarm Flag )  
When an alarm occurs the AF bit sets to 1.  
Data is kept until 0 is written to bit. 1cannot be written to this bit.  
AIE bit ( Alarm Enable )  
AIE bit decides whether to generate the interrupt signal when the alarm events occur.  
The AIE bit controls the alarm interrupt.  
8.2.6. Control register 2 ( Reg-F )  
Address  
F
bit 7  
¡
bit 6  
bit 5  
bit 4  
bit 3  
bit 2  
¡
bit 1  
¡
bit 0  
¡
TEST0  
STOP  
RESET HOLD  
TEST0 bit : this bit is reserved for testing work by EPSON.  
Be sure to always set this bit to 0. Be careful not to set this bit to 1 accidentally when writing to other bits of  
Reg-F. It can be cleared by setting the CE pin to "L".  
STOP bit  
When this bit is set to 1, the clock stops after 2 kHz of split cycle counter. When this bit becomes 0 the  
clock resumes. When you needs stop to the clock update, set " 1" to STOP bit and RESET bit both.  
RESET bit  
When this bit is set to 1, the counter between 2 kHz and 1 Hz is reset and the clock also stops. After 1 is  
written to this bit, this can be released by setting CE to "L". This bit is not influenced by states of the other  
bits. When you use this bit, and update stops, use STOP bit simultaneously.  
HOLD bit  
When this bit is set to 1, second digit increase is prohibited. If second digit increase happens while this bit  
is set to 1, when this bit returns to 0 the automatic compensation will work to correct by one unit. It is  
recommended that the HOLD bit be within one second.  
Function description table  
Bit  
Function  
Alarm  
Additional  
counter  
STOP  
RESET  
HOLD  
Clock  
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
runs  
1
runs  
stops  
stops  
stops  
stops  
stops  
stops  
stops  
runs 2  
stops  
stops  
stops  
stops  
stops  
stops  
stops  
stops  
stops  
stops  
stops  
stops  
stops  
1 : If the deviation is within 1 second, the automatic compensation function will kick in to  
perform the automatic compensation.  
2: Runs only the ACE( Additional Counter Enable ) bit is 1.  
Page - 9  
MQ - 392 - 01  
RX - 4702 CF  
8.3. Read/write of data  
After read/write and the CE input rise, the 4-bit mode is set up and then the 4-bit address is specified. Then, data  
read/write in units of 8 bits is performed. If input of unit of 8-bit data is not finished before the CE input falls, the 8-bit  
write data will be ignored at the time CE input falls. (The previous data is undetermined.) Both read and write use  
LSB-First.  
Auto incrementing of the address is cyclic, so address "F" is followed by address "0".  
8.3.1. Write of data  
1) Take "3" as the write mode in the first four bits after the CE input rise, and set the address to write to the  
next four bits.  
2) The next 8 bits of write data is written to the address set earlier, and the next 8 bits of data is written to  
the address which is automatically incremented from the last one.  
C E  
CLK  
DATA  
D0 D1 D2 D3 D0 D1 D2 D3 D0 D1 D2 D3 D4 D5 D6 D7 D0 D1 D2 D3 D4 D5 D6 D7  
Write mode  
setup code (3)  
Setup address (N)  
Data write(address N)  
Data write(address N+1)  
* When writing data, the data needs to be entered in 8-bits units.  
If the input of data in 8-bits unit is not completed before CE input falls, the 8-bits data will not be written  
properly at the time CE input falls.  
8.3.2. Read of data  
1) Take "C" as the read mode in the first four bits after the CE input rise, and set the address to read to the  
next four bits.  
2) The next 8 bits of read data is read from the address set earlier, and the next 8 bits of data is read from  
the address which is automatically incremented from the last one.  
C E  
CLK  
D0 D1  
D0 D1  
D0 D1 D2 D3 D0 D1 D2 D3  
D2 D3 D4 D5 D6 D7  
Data read(address N)  
D2 D3 D4 D5 D6 D7  
Data read(address N+1)  
DATA  
Setup address  
Read mode  
setup code (C)  
From here the DATA pin turns into the output  
8.3.3. Write/Read mode setup code.  
2
Mode  
Setup  
Code  
Prohibition  
Code  
Write  
Read  
3 h  
C h  
1 h  
8 h  
1) In the mode setting code, if a value other than those listed above is used, the subsequent data will be  
ignored and the DATA pin remains in the input state.  
2) Don't use the Prohibition code.  
Page - 10  
MQ - 392 - 01  
RX - 4702 CF  
8.4. Alarm interrupt  
When the alarm matches and AIE=1, the /IRQ pin outputs "L"; when AIE=0, the /IRQ pin is at the high impedance  
level. The alarm interrupt is output when "carry" from the 10-second digit to minute digit occurs  
"1"  
"1"  
"1"  
AIF bit  
The AIE bit is not output in the 0 range.  
"0"  
"0"  
High impedance  
/IRQ output  
AF bit  
"L" level  
"1"  
"0"  
Alarm interrupt timing  
0 is written to the AF bit.  
How to use it  
The day of week, day, hour, and minute can be set. For day of week, multiple days can be set at a time.  
To avoid unintended hardware interrupt during the alarm setup, it is recommended that initially both the AF  
bit and AIE bit be set to 0. Then, set up the alarm data, and apply zero clear to the AF flag in order to  
initialize the alarm circuitry with certainty. Afterwards, set the AIE bit to 1. If no hardware interrupt is  
desired to be used, set the AIE bit to 0, and monitor the AF bit with software as required.  
Usage example  
1 ) Set the alarm to go off at 6 PM tomorrow  
0 to the AIE bit and the AF bit.  
· Write  
· Write 1 to the AE bit of the day alarm.  
· Get the current day of week stored in register 3 in the day of week alarm register, left shift the data  
by 1 bit and then perform the write operation. (Be careful with the fr bit. If bit 6 is 1 (Saturday),  
write 01h (Sunday).)  
· Write 18h to the hour alarm register.  
· Write 00h to the minute alarm register.  
· Apply zero clear to the AF bit.  
· Write 1 to the AIE bit.  
2 ) Set the alarm to go off at 6 am everyday except Saturday and Sunday  
· Write 0 to the AIE bit and the AF bit.  
· Write 1 to the AE bit of the day alarm.  
· Write 3Eh to the day of week alarm register.  
· Write 06h to the hour alarm register.  
· Write 00h to the minute alarm register.  
· Apply zero clear to the AF bit.  
· Write 1 to the AIE bit.  
Page - 11  
MQ - 392 - 01  
RX - 4702 CF  
8.5. FOE start function  
When the FOES(FOE Start Mode) bit of control register 3 is set to 1, the additional counter function triggered by  
FOE starts. While this mode is selected, the additional counter does not starts when 1 is written to the ACE  
(Additional Counter Enable) bit of control register 3.  
With the ACE bit being 1, the additional counter starts when the FOE input pin changes from the "H" level to the "L"  
level (fall edge). After the additional counter starts, regardless of the state of the FOE pin, as long as it is not  
stopped by the register operation (ACE bit being 0), it will continue even if RTC is in the non-selected state. When  
the power is supplied initially, the FOES bit is reset to 0.  
FOE pin  
Calculation  
counter  
Counter starts  
Counter starts  
ACE:"1"  
ACE:"0" ACE:"1"  
Software process  
8.6. Power Down / power Up Timing.  
VDD  
VCLK  
CD  
F
R
t
t
t
tCU  
CE  
VIL  
VIL  
Backup  
Parameter  
Symbol  
Condition  
Min.  
0
2
1
0
Typ.  
Max.  
Unit  
CE time before power drop  
Power drop time  
Power rise time  
tCD  
tF  
tR  
µs  
µs / V  
µs / V  
µs  
CE time after power rise  
tCU  
When main power souce input to VDD from backup condition, CE should be definitely LOW  
8.7. External connection example  
Note  
4.7 µF  
DD  
V
Schottky  
Barrier  
Diode  
+
V
DD  
RX - 4702  
VO  
V
SS  
Voltage  
Detector  
V
DD  
CE  
DATA  
CLK  
0.1 µF  
/ IRQ  
FOUT  
FOE  
GND  
Note :  
It uses the secondary battery or a lithium battery. When using the secondary battery, the diode is not required.  
When using the lithium battery, the diode is required.  
For detailed value on the resistance, please consult a battery manufacturer.  
Page - 12  
MQ - 392 - 01  
RX - 4702 CF  
9. External dimensions / Marking layout  
9.1. External dimensions  
RX - 4702 CF ( SON-10pin )  
External dimensions  
Recommended soldering pattern  
5.0 ± 0.2  
0.4  
0.26  
1.0  
#10  
# 6  
1.0  
0.6  
# 1  
# 5  
# 5  
# 1  
4.6  
1.2 Max.  
0.1  
Unit : mm  
9.2. Marking layout  
RX - 4702 CF ( SON-10pin )  
Logo  
Type  
E 4702  
123 A  
#1 Pin Mark  
Production lot  
Contents displayed indicate the general markings and display, but are not the standards for the fonts, sizes and positioning.  
Page - 13  
MQ - 392 - 01  
RX - 4702 CF  
10. Reference data  
(1)Example of frequency and temperature  
characteristics  
[Finding the frequency stability]  
θT = +25 C Typ.  
°
1. Frequency and temperature characteristics can be  
approximated using the following equations.  
fT = α ( θT - θX )2  
10-6  
= -0.035 10-6 Typ.  
×
α
×
0
: Frequency deviation in any temperature  
fT  
α
1 / °C2 )  
: Coefficient of secondary temperature  
( ( 0.035±0.005 ) × 10-6 / °C2 )  
: Ultimate temperature (+25±5 °C)  
: Any temperature  
-50  
-100  
-150  
θT °C )  
θX °C )  
2. To determine overall clock accuracy, add the frequency  
precision and voltage characteristics.  
-50  
0
+50  
+100  
Temperature [ C]  
°
f/f = f/fo + fT + fV  
: Clock accuracy (stable frequency) in  
any temperature and voltage.  
: Frequency precision  
: Frequency deviation in any  
temperature.  
f/f  
(2) Example of frequency and voltage characteristics  
f/fo  
fT  
Condition :  
3 V as reference, Ta=+25 °C  
+ 3  
: Frequency deviation in any voltage.  
fV  
0
3. How to find the date difference  
Date Difference = f/f × 86400(Sec)  
* For example: f/f = 11.574 × 10-6 is an error of  
approximately 1 second/day.  
- 3  
2
3
4
5
DD  
Supply Voltage V [V]  
(3) Current and voltage consumption characteristics  
(3-1) Current consumption when non-accessed (i)  
when FOUT=OFF  
(3-2) Current consumption when non-accessed (ii)  
when FOUT=32.768kHz  
Condition :  
Condition :  
Ta = +25 °C  
CE, /SOFF, FOE = GND  
Ta = +25 °C  
CE, /SOFF = GND  
1.0  
10  
DD  
/ IRQ = V  
DD  
FOE, / IRQ = V  
FOUT ; Output OFF  
FOUT ; 32.768 kHz output ON  
CL=30 pF  
0.5  
5
CL=0 pF  
5
2
3
4
5
2
3
4
DD  
DD  
Supply Voltage V [V]  
Supply Voltage V [V]  
Page - 14  
MQ - 392 - 01  
RX - 4702 CF  
11. Application notes  
1) Notes on handling  
This module uses a C-MOS IC to realize low power consumption. Carefully note the following cautions when handling.  
(1) Static electricity  
While this module has built-in circuitry designed to protect it against electrostatic discharge, the chip could still be damaged by a  
large discharge of static electricity. Containers used for packing and transport should be constructed of conductive materials. In  
addition, only soldering irons, measurement circuits, and other such devices which do not leak high voltage should be used with  
this module, which should also be grounded when such devices are being used.  
(2) Noise  
If a signal with excessive external noise is applied to the power supply or input pins, the device may malfunction or "latch up." In  
order to ensure stable operation, connect a filter capacitor (preferably ceramic) of greater that 0.1F as close as possible to the  
power supply pins (between VDD and GNDs). Also, avoid placing any device that generates high level of electronic noise near  
this module.  
* Do not connect signal lines to the shaded area in the figure shown in Fig. 1 and, if possible, embed this area in a GND land.  
(3) Voltage levels of input pins  
When the input pins are at the mid-level, this will cause increased current consumption and a reduced noise margin, and can  
impair the functioning of the device. Therefore, try as much as possible to apply the voltage level close to VDD or GND.  
(4) Handling of unused pins  
Since the input impedance of the input pins is extremely high, operating the device with these pins in the open circuit state can  
lead to unstable voltage level and malfunctions due to noise. Therefore, pull-up or pull-down resistors should be provided for all  
unused input pins.  
2) Notes on packaging  
(1) Soldering heat resistance.  
If the temperature within the package exceeds +260 °C, the characteristics of the crystal oscillator will be degraded and it may  
be damaged. The reflow conditions within our reflow profile is recommended. Therefore, always check the mounting  
temperature and time before mounting this device. Also, check again if the mounting conditions are later changed.  
* See Fig. 2 profile for our evaluation of Soldering heat resistance for reference.  
(2) Mounting equipment  
While this module can be used with general-purpose mounting equipment, the internal crystal oscillator may be damaged in  
some circumstances, depending on the equipment and conditions. Therefore, be sure to check this. In addition, if the mounting  
conditions are later changed, the same check should be performed again.  
(3) Ultrasonic cleaning  
Depending on the usage conditions, there is a possibility that the crystal oscillator will be damaged by resonance during  
ultrasonic cleaning. Since the conditions under which ultrasonic cleaning is carried out (the type of cleaner, power level, time,  
state of the inside of the cleaning vessel, etc.) vary widely, this device is not warranted against damage during ultrasonic  
cleaning.  
(4) Mounting orientation  
This device can be damaged if it is mounted in the wrong orientation. Always confirm the orientation of the device before  
mounting.  
(5) Leakage between pins  
Leakage between pins may occur if the power is turned on while the device has condensation or dirt on it. Make sure the device  
is dry and clean before supplying power to it.  
Fig. 1 : Example GND Pattern  
Fig. 2 : Reference profile for our evaluation of Soldering heat resistance.  
Temperature [ °C ]  
RX - 4702 CF  
( SON - 10pin )  
+260 °C Max.  
1 5 °C / s  
+1 +5 °C / s  
+170 °C  
+220 °C  
+1 +5 °C / s  
100 s  
35 s  
Pre-heating area  
Stable Melting area  
time [ s ]  
In addition, please confirm the Notes of an individual specification.  
Page - 15  
MQ - 392 - 01  
Application Manual  
Distributor  
AMERICA  
EPSON ELECTRONICS AMERICA, INC.  
HEADQUARTER  
150 River Oaks Parkway, San Jose, CA 95134, U.S.A.  
Phone: (1)800-228-3964 (Toll free) : (1)408-922-0200 (Main) Fax: (1)408-922-0238  
http://www.eea.epson.com  
Atlanta Office  
3010 Royal Blvd. South, Ste. 170, Alpharetta, GA 30005, U.S.A.  
Phone: (1)877-332-0020 (Toll free) : (1)770-777-2078 (Main) Fax: (1)770-777-2637  
Boston Office  
Chicago Office  
El Segundo Office  
301Edgewater Place, Ste. 120, Wakefield, MA 01880, U.S.A.  
Phone: (1)800-922-7667 (Toll free) : (1)781-246-3600 (Main) Fax: (1)781-246-5443  
101 Virginia St., Ste. 290, Crystal Lake, IL 60014, U.S.A.  
Phone: (1)800-853-3588 (Toll free) : (1)815-455-7630 (Main) Fax: (1)815-455-7633  
1960 E. Grand Ave., 2nd Floor, El Segundo, CA 90245, U.S.A.  
Phone: (1)800-249-7730 (Toll free) : (1)310-955-5300 (Main) Fax: (1)310-955-5400  
EUROPE  
EPSON EUROPE ELECTRONICS GmbH  
HEADQUARTER  
Riesstrasse 15, 80992 Munich, Germany  
Phone: (49)-(0)89-14005-0 Fax: (49)-(0)89-14005-110  
http://www.epson-electronics.de  
Düsseldorf Branch Office  
Altstadtstrasse 176, 51379 Leverkusen, Germany  
Phone: (49)-(0)2171-5045-0 Fax: (49)-(0)2171-5045-10  
UK & Ireland Branch Office Unit 2.4, Doncastle House, Doncastle Road, Bracknell, Berkshire RG12 8PE, England  
Phone: (44)-(0)1344-381700 Fax: (44)-(0)1344-381701  
French Branch Office  
LP 915 Les Conquérants, 1 Avenue de l' Atlantique, Z.A. de Courtaboeuf 2  
91976 Les Ulis Cedex, France  
Phone: (33)-(0)1-64862350 Fax: (33)-(0)1-64862355  
ASIA  
EPSON (CHINA) CO., LTD.  
23F, Beijing Silver Tower 2# North RD DongSangHuan ChaoYang District, Beijing, China  
Phone: (86) 10-6410-6655 Fax: (86) 10-6410-7319  
http://www.epson.com.cn  
4F, Bldg.,27, No.69, Gui Qing Road, Cao hejing, Shanghai, China  
Phone: (86) 21-6485-0835 Fax: (86) 21-6485-0775  
EPSON HONG KONG LTD.  
20/F., Harbour Centre, 25 Harbour Road, Wanchai, Hong kong  
Phone: (852) 2585-4600 Fax: (852) 2827-2152  
http://www.epson.com.hk  
EPSON ELECTRONIC TECHNOLOGY DEVELOPMENT (SHENZHEN )CO., LTD.  
Flat 16A, 16/F, New Times Plaza, No.1 Taizi Road, Shenzhen, China  
Phone: (86) 755-6811118 Fax: (86) 755-6677786  
EPSON TAIWAN TECHNOLOGY & TRADING LTD.  
14F, No.7, Song Ren Road, Taipei 110  
Phone: (886) 2-8786-6688 Fax: (886)2-8786-6660  
EPSON SINGAPORE PTE. LTD.  
No.1, Temasek Avenue #36-00, Millenia Tower, Singapore 039192  
Phone: (65) 337-7911 Fax: (65) 334-2716 http://www.epson.com.sg  
SEIKO EPSON CORPORATION KOREA Office  
50F, KLI 63 Building,60 Yoido-dong, Youngdeungpo-Ku, Seoul, 150-763, Korea  
Phone: (82) 2-784-6027 Fax: (82) 2-767-3677 http://www.epson-device.co.kr  
http://www.epson.com.tw  
Gumi Branch Office  
6F, Good Morning Securities Bldg., 56, Songjeong-dong Gumi-City, Gyongsangbuk-Do,  
730-090, Korea  
Phone: (82) 54-454-6027 Fax: (82) 54-454-6093  
ELECTRONIC DEVICE MARKETING DEPARTMENT  
Electronic devices information on WWW server  
http://www.epsondevice.com  
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