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RX-4591CF

型号：

RX-4591CF

品牌：

SEIKO[ SEIKO EPSON CORPORATION ]

页数：

19 页

PDF大小：

256 K

下载PDF手册
MQ402-01  
Application Manual  
Real Time Clock Module  
RX-4591CF  
Model  
Product Number  
RX-4591CF  
Q414591A0000200  
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 - 4591 CF  
CONTENTS  
1. Overview.................................................................................................................. 1  
2. Block diagram........................................................................................................ 1  
3. Terminal description............................................................................................ 2  
3.1. Terminal connections.............................................................................................................. 2  
3.2. Pin functions.............................................................................................................................. 2  
4. Absolute maximum ratings................................................................................ 3  
5. Recommended operating functions............................................................... 3  
6. Frequency characteristics................................................................................. 3  
7. Electrical characteristics.................................................................................... 3  
7.1. DC electrical characteristics ................................................................................................. 3  
7.2. AC electrical characteristics.................................................................................................. 4  
8. How to use.............................................................................................................. 5  
8.1. Register table............................................................................................................................ 5  
8.2. Register description................................................................................................................. 6  
8.2.1. Clock and calendar registers (Reg-0 to Reg-6)................................................................. 6  
8.2.2. Alarm registers (Reg-8 to Reg-A) ...................................................................................... 6  
8.2.3. Timer counter (Reg-B and Reg-C)..................................................................................... 7  
8.2.4. Control register and flag register (between Reg-D and Reg-F)......................................... 8  
8.3. Read/Write of data .................................................................................................................. 9  
8.3.1. Write of data...................................................................................................................... 9  
8.3.2. Read of data...................................................................................................................... 9  
8.3.3. Write/Read mode setting code for each bank ................................................................... 9  
8.4. Alarm interrupt / Timer interrupt ........................................................................................ 10  
80.4.1. Alarm interrupt............................................................................................................... 10  
8.4.2. Timer interrupt ................................................................................................................. 11  
8.6. Shifting to backup and returning ....................................................................................... 12  
8.7. External connection example............................................................................................. 12  
9. External dimension / Marking layout........................................................... 13  
9.1. External dimensions.............................................................................................................. 13  
9.2. Marking layout......................................................................................................................... 13  
10. Reference data................................................................................................. 14  
11. Application notes.............................................................................................. 15  
RX - 4591 CF  
Miniature Serial Interface RTC Module  
RX - 4591 CF  
• Built-in 32.768 kHz crystal oscillator with frequency adjusted  
• Serial interface in 4 lines form  
( possible to make it to 3 lines by wired-OR connecting DI and DO pins )  
( /IRQ pin )  
( /IRQ pin )  
• Alarm interrupt function for day of the week, day, hour, and minute  
• Timer interrupt function  
( second·minute, /AIRQ pin )  
( FOE, FOUT pins )  
• Time update interrupt function  
• OE function 32.768 kHz output  
• Automatic adjustment for leap year (supports from year 2000 to 2099)  
• Wide range of interface voltage between 1.6 V and 5.5 V  
• Wide range of clock (retained) voltage between 1.2 V and 5.5 V  
• Low current consumption at 0.3 µA / 3 V ( Typ.)  
• Available as small package ( CF : SON−10 pin PKG. )  
1. Overview  
This module is a real-time clock with serial interface in 4 lines form (or 3 lines form). It has a built-in crystal  
oscillator. The module offers many functions such as Clock & Calendar circuitry with automatic leap year  
adjustment, interval timer, time update interrupt, and other rich functions like 32.768 kHz output. Because it is  
available in small package SON-22 pin in high density mounting, it is ideally suited for applications such as  
mobile phone, handy terminals and other small electronic systems.  
2. Block diagram  
32.768 kHz  
CLOCK  
and  
CALENDAR  
OSC  
DIVIDER  
FOUT  
FOE  
FOUT  
CONTROLLER  
TIMER  
REGISTER  
INTERRUPTS  
CONTROLLER  
ALARM  
REGISTER  
/ IRQ  
D I  
CONTROL  
REGISTER  
BUS  
DO  
CLK  
CE  
INTERFACE  
CIRCUIT  
and  
SYSTEM  
CONTROLLER  
Page - 1  
MQ - 402 - 01  
RX - 4591 CF  
3. Terminal description  
3.1. Terminal connections  
RX - 4591 CF  
1. VDD  
10. CE  
9. CLK  
8. DO  
7. D I  
# 1  
# 10  
# 6  
2. FOE  
3. / IRQ  
4. T1  
# 5  
5. FOUT  
6. GND  
SON - 10pin  
3.2. Pin 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.  
Also, when the chip is not selected, the DO pin is at the high impedance level, and the  
CLK and DI pins would not accept input.  
CE  
Input  
This is the shift clock input pin for serial data transfer.  
CLK  
D I  
Input  
Input  
In the write mode, it takes in data from the DI pin using the CLK signal rise edge. In the  
read mode, it outputs data from the DO pin using the fall edge.  
This is the data input pin for serial data transfer.  
This is the data output pin for serial data transfer.  
DO  
Output  
This is the C-MOS output pin with output control provided via the FOE pin.  
When FOE = "H" (high level), this pin outputs a 32.768-kHz signal.  
When output is stopped, the FOUT pin = "L" (low level).  
FOUT  
Output  
This is an input pin used to control the output mode of the FOUT pin.  
When this pin's level is high, the FOUT pin is in output mode. When it is low, output via  
the FOUT pin is stopped.  
FOE  
Input  
/ IRQ  
T1  
Output  
This is an open drain output pin for alarm and additional counter interrupt.  
This pin is used by the manufacturer for testing.  
Be sure to connect this pin to GND.  
−
VDD  
This pin connects to the plus side of the power.  
−
−
GND  
This pin connects to the minus side (ground) of the power.  
Note: Be sure to connect a bypass capacitor rated at least 0.1 μF between VDD and GND.  
Page - 2  
MQ - 402 - 01  
RX - 4591 CF  
4. Absolute maximum ratings  
GND=0 V  
Item  
Symbol  
Condition  
Rating  
Unit  
Power voltage  
Input voltage  
VDD  
VIN  
Between VDD and GND  
Input pin  
to +6.5  
V
V
V
−0.3  
GND−0.3  
GND−0.3  
to VDD+0.3  
to VDD+0.3  
to +6.5  
Output voltage (1)  
Output voltage (2)  
Storage temperature  
VOUT1  
DO, FOUT pins  
VOUT2  
TSTG  
/ IRQ pin  
V
GND−0.3  
−55  
Stored bare product after unpacking  
to +125  
°C  
5. Recommended operating functions  
GND=0 V  
Item  
Symbol  
Condition  
Min.  
Typ.  
Max.  
Unit  
Operating power voltage  
Clock power voltage  
Operating temperature  
VDD  
VCLK  
TOPR  
1.6  
1.2  
−40  
3.0  
3.0  
+25  
5.5  
5.5  
+85  
V
V
°C  
−
−
No condensation  
6. Frequency characteristics  
GND=0 V  
Item  
Symbol  
Condition  
Rating  
5 ± 23  
Unit  
× 10−6  
( 1) ( 2)  
Frequency precision  
Frequency voltage  
characteristics  
Frequency temperature  
characteristics  
Oscillation start up time  
Aging  
∆ f / f  
Ta= +25 °C, VDD=3.0 V  
f / V  
Top  
Ta= +25 °C, VDD=2.0 V to 5.0 V  
± 2 Max.  
× 10−6 / V  
Ta= −20 °C to +70 °C,  
VDD= 3.0 V ; reference at +25 °C  
Ta= +25 °C, VDD=3.0 V  
+10 / −120  
× 10−6  
tSTA  
3 Max.  
± 5 Max.  
s
Ta= +25 °C, VDD=3.0 V ; first year  
× 10−6 / year  
fa  
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  
Item  
Symbol  
Condition  
Min.  
Typ.  
Max.  
Unit  
Current consumption  
(1)  
Current consumption  
(2)  
CE = GND  
/IRQ = VDD  
FOUT ;  
Output OFF ( low level )  
Input pin  
Input pin ( 5 V ± 10 % )  
Input pin  
Input pin ( 5 V ± 10 % )  
IDD1  
VDD=5 V  
VDD=3 V  
0.4  
0.9  
µA  
IDD2  
0.3  
0.8  
VIH1  
VIH2  
VIL1  
V
V
V
V
0.70 × VDD  
0.75 × VDD  
GND − 0.3  
GND − 0.3  
4.5  
VDD + 0.3  
VDD + 0.3  
0.30 × VDD  
0.25 × VDD  
5.0  
"H" input voltage  
" L " input voltage  
VIL2  
VOH1  
VOH2  
VOH3  
VOH4  
VOH5  
VOL1  
VOL2  
VOL3  
VOL4  
VOL5  
RDWN1  
RDWN2  
VDD = 5 V, IOH = −1 mA  
VDD = 3 V, IOH = −1 mA  
VDD = 3 V, IOH = −100 µA  
VDD = 5 V, IOH = −1 mA  
VDD = 3 V, IOH = −1 mA  
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  
VDD=5 V  
DO pin  
2.2  
2.9  
4.75  
2.6  
GND  
GND  
GND  
GND  
3.0  
3.0  
5.0  
3.0  
"H" Output voltage  
"L" Output voltage  
V
V
FOUT pin  
DO pin  
GND+0.5  
GND+0.8  
GND+0.1  
GND+0.25  
GND+0.4  
300  
FOUT,  
/IRQ pins  
CE pin  
VIN = VDD  
GND  
75  
150  
Input resistance (1)  
Input resistance (2)  
150  
300  
kΩ  
µA  
µA  
V
VDD=3 V  
600  
Input pin other than CE  
VIN = VDD or GND  
Input leakage current  
ILK  
0.5  
0.5  
−0.5  
Output leakage  
current  
Power supply  
detection voltage  
IOZ  
Output pin, VOUT = VDD or GND  
−0.5  
VDET  
VLOW  
VDD pin  
VDD pin  
1.6  
1.1  
1.8  
1.2  
2.0  
1.4  
Page - 3  
MQ - 402 - 01  
RX - 4591 CF  
7.2. AC electrical characteristics  
If not specifically indicated, GND=0 V, Ta= −40 °C to +85 °C  
VDD = 3 V 10  
VDD = 5 V 10  
±
%
±
%
Item  
Symbol  
Condition  
Unit  
Min.  
Max.  
Min.  
Max.  
tCLK  
tWH  
tWL  
tRF  
CLK clock cycle  
500  
250  
250  
350  
175  
175  
ns  
ns  
ns  
ns  
ns  
ns  
ns  
ns  
s
ns  
ns  
ns  
ns  
CLK H pulse width  
CLK L pulse width  
CLK rise and fall time  
CLK setup time  
100  
50  
tCLKS  
50  
25  
tCS  
CE setup time  
200  
200  
300  
150  
100  
200  
tCH  
CE hold time  
tCR  
CE recovery time  
CE enable time  
tWCE  
0.95  
0.95  
tDS  
Write data setup time  
Write data hold time  
Read data delay time  
DO output switching time  
100  
100  
50  
50  
tDH  
tRD  
L
C =50 pF  
200  
50  
150  
25  
tZR  
CL=50 pF  
tRZ  
tZZ  
DO output disable time  
200  
100  
ns  
ns  
RL=10 kΩ  
DI/DO conflict avoiding time  
0
0
Timing chart  
tWCE  
t
CS  
C E  
tCLK  
tRF  
tRF  
tCLKS  
t
t
t
t
CR  
WL WH  
CH  
%
80  
CLK  
20 %  
tDS tDH  
M 3  
• Read  
D I  
M 2  
A 0  
tZZ  
tRD  
D 7  
tRZ  
Hi-Z  
D O  
D 6  
D 6  
D 0  
t
ZR  
• Write  
D I  
M 3  
M 2  
A 0  
D 7  
D 0  
Hi-Z  
D O  
If DI and DO pins are wired-OR connected to make it to 3 lines form, secure tzz to avoid bus conflict.  
Page - 4  
MQ - 402 - 01  
RX - 4591 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
SEC  
MIN  
40  
40  
{
20  
20  
20  
5
10  
10  
10  
4
8
8
8
3
8
8
8
•
4
4
4
2
4
4
4
•
2
2
1
1
3
3
3
3
3
3
{
{
{
{
{
HOUR  
2
1
WEEK  
6
{
{
1
0
DAY  
20  
{
10  
10  
10  
•
2
1
MONTH  
2
1
YEAR  
80  
•
40  
•
20  
•
2
1
−
RAM  
•
•
4
6
MIN Alarm  
HOUR Alarm  
WEEK Alarm  
DAY Alarm  
Timer Counter 0  
Timer Counter 1  
Extension Register  
Flag Register  
Control Register  
AE  
AE  
40  
•
20  
20  
5
10  
10  
4
8
8
3
8
8
4
4
2
4
4
2
1
2
1
4, 6  
6
1
0
A
AE  
4, 6  
20  
32  
•
10  
16  
•
2
1
•
B
C
128  
•
64  
•
2
1
7
2048 1024  
512  
256  
4, 7  
3, 5  
1, 2  
3, 5  
{
TEST1  
TEST3  
D
WADA USEL  
TE  
TF  
TIE  
TSEL1 TSEL0  
E
VDET VLOW UF  
AF  
ICNT VLF PON  
{
TEST2  
{
F
UIE  
AIE  
STOP RESET  
Note  
When after the initial power-up or when the result of read out the VLF 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.  
During the initial power-up, the VLF bit is set to "1".  
1 )  
2 )  
And, all register values are undefined, so be sure to initialize all registers.  
Only the writes clear to "0" is possible for UF,TF,AF, and VLF.  
3 ) All bits marked with ' { ' are read-only bits. Their value when read is always "0".  
4 ) Any bit marked with ' • ' is a RAM bit that can be used to read or write any data.  
TEST1, TEST2, TEST3 bits are used by manufacture for testing. Be sure to set it to "0" before use.  
When alarm is not used, addresses between 8 and A can be used as RAM (AIE = "0").  
5 )  
6 )  
7 )  
When the timer counter (addresses B and C) is read, the data value preset previously can be read.  
When the timer is not used, addresses B and C can be used as RAM (TE,TIE = "0").  
The first 4 bits that sets mode code in the serial communication specify R/W for Bank 0 and Bank 1.  
(For details, see the [8.3. Read/Write of data] section.)  
8 )  
Setup  
Mode  
Code  
Read  
Write  
8 h  
0 h  
Page - 5  
MQ - 402 - 01  
RX - 4591 CF  
8.2. Register description  
8.2.1. Clock and calendar registers (Reg-0 to Reg-6)  
• Data format  
Data is in the BCD format. For example, if the SEC register is set to "0101 1001", this means 59 seconds.  
The time measurement is in 24-hour format (fixed).  
• YEAR register and leap year  
The YEAR register becomes year 00 after year 99.  
Divide the YEAR register’s 2-digit BCD by four, and if the remainder is 0, then this year is determined as the  
leap year. ( Year 00 is processed as a leap year. This calendar expires in year 2099.)  
• Day of the WEEK register  
The day of the WEEK register is made of 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  
0
bit 5  
0
bit 4  
0
bit 3  
0
bit 2  
0
bit 1  
0
bit 0  
1
Day of the week  
Sunday  
0
0
0
0
0
1
0
Monday  
0
0
0
0
1
0
0
Tuesday  
0
0
0
1
0
1
0
0
0
0
0
Wednesday  
Thursday  
Friday  
0
0
0
0
0
0
1
0
0
0
1
0
0
0
0
0
0
Saturday  
8.2.2. Alarm registers (Reg-8 to Reg-A)  
Address  
Function  
bit 7  
bit 6  
bit 5  
bit 4  
bit 3  
bit 2  
bit 1  
bit 0  
8
MIN alarm  
AE  
40  
20  
20  
5
10  
10  
4
8
8
3
8
4
4
2
4
2
2
1
2
1
1
0
1
9
HOUR alarm  
WEEK alarm  
DAY alarm  
AE  
•
6
•
A
AE  
20  
10  
You can set the day of the week, day, hour and minute for alarm. The WADA bit specifies which alarm of the WEEK  
alarm or the DAY alarm assign to the register A.  
Bit 7 is the AE (Alarm Enable) bit for all the alarm registers. By using this bit, you can easily set the hourly alarm and  
the daily alarm. The day of the week alarm can be set to any multiple days of week.  
When the AE bit is set to "0", the appropriate register and the clock register are compared; when the AE bit is set to  
"1" ("don’t care"), the two registers are not compared because they are considered to have the same value.  
When the alarm goes off, the AF (Alarm Flag) bit of Reg-E is set to "1"; if at this moment the AIE (Alarm Interrupt  
Enable) bit of Reg-F has been set to "1", the /IRQ pin is set to the low level and the interrupt signal occurs. If the AIE  
bit has been set to "0", the alarm interrupt output from the /IRQ pin is prohibited.  
If alarm interrupt is not used, then addresses 8 to A can be used as memory registers. In this case, set the AIE bit to  
"0" to prohibit usage of the alarm and alarm interrupt.  
• The relationship between the day of the week alarm bit and each day of the week  
bit  
bit 6  
bit 5  
Bit 4  
bit 3  
bit 2  
bit 1  
bit 0  
Day of the week Saturday Friday Thursday Wednesday Tuesday Monday Sunday  
Page - 6  
MQ - 402 - 01  
RX - 4591 CF  
8.2.3. Timer counter (Reg-B and Reg-C)  
Address  
Function  
bit 7  
128  
•
bit 6  
64  
•
bit 5  
32  
•
bit 4  
16  
•
bit 3  
bit 2  
bit 1  
bit 0  
B
Timer counter 0  
8
4
2
1
C
Timer counter 1  
2048  
1024  
512  
256  
This register controls 12 bits of internal preset-able down counter used for timer interrupt.  
TSEL0 and TSEL1 of Reg-D specify the count cycle of the down counter (source clock). Timer counter 0 and timer  
counter 1 specify the preset value of the down counter.  
When the TE bit of Reg-D is set to "0, The presetable counter loads the written data to the timer counter (It is initial  
value. ), and then stops the count down. Afterwards, when the TE bit set to 1, count down starts.  
Using a source clock cycle, the down counter continues the countdown. When the data becomes zero, the TF (Timer  
Flag) of Reg-E is set to "1". At this moment, if the TIE bit (Timer Interrupt Enable) of Reg-F was set to 1 beforehand,  
the /IRQ pin is asserted low for generate the interrupt signal.  
When the TIE bit is set to "0", output from the /IRQ pin is prohibited.  
Next, it reloads the data of timer counter register and restarts the countdown (repeat operation).  
But, even if write 1 to the TE bit, and write 0 to the timer counter, timer interrupt from the /TIRQ pin is not generated.  
In order to operate timer expectedly, you should set the TE bit and the TIE bit adequately.  
If timer interrupt is not used, then addresses B and C may be used as memory registers. In this case, set TE bit and  
TIE bit to "0", to prohibit timer operation and timer interrupts.  
• Timer interrupt and source clock selection  
TSEL1  
TSEL0  
Source clock  
0
0
1
1
0
1
0
1
4096 Hz  
64 Hz  
1 Hz  
Update in minutes  
• Timer interrupt interval  
Timer  
counter  
setting  
value  
Source clock  
Update in  
minutes  
4096 Hz  
64 Hz  
1 Hz  
0
1
2
−
−
−
−
15.625 ms  
31.25 ms  
1 s  
2 s  
1 min  
2 min  
•
•
•
244.14 µs  
488.28 µs  
•
•
•
•
•
•
•
•
•
•
•
•
41  
82  
10.010 ms  
20.020 ms  
31.250 ms  
46.875 ms  
50.049 ms  
78.125 ms  
100.10 ms  
156.25 ms  
200.20 ms  
300.05 ms  
312.50 ms  
468.75 ms  
500.00 ms  
625.00 ms  
0.7813 s  
640.63 ms  
1.281 s  
41 s  
82 s  
41 min  
82 min  
128  
2.000 s  
128 s  
192 s  
205 s  
320 s  
410 s  
640 s  
820 s  
1229 s  
1280 s  
1920 s  
2048 s  
2560 s  
3200 s  
3840 s  
128 min  
192 min  
205 min  
320 min  
410 min  
640 min  
820 min  
1229 min  
1280 min  
1920 min  
2048 min  
2560 min  
3200 min  
3840 min  
192  
3.000 s  
205  
3.203 s  
320  
5.000 s  
410  
6.406 s  
640  
10.000 s  
12.813 s  
19.203 s  
20.000 s  
30.000 s  
32.000 s  
40.000 s  
50.000 s  
60.000 s  
820  
1229  
1280  
1920  
2048  
2560  
3200  
3840  
0.9375 s  
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
4095  
0.9998 s  
63.984 s  
4095 s  
4095 min  
Page - 7  
MQ - 402 - 01  
RX - 4591 CF  
8.2.4. Control register and flag register (between Reg-D and Reg-F)  
Address  
Function  
bit 7  
bit 6  
bit 5  
bit 4  
bit 3  
{
bit 2  
bit 1  
TSEL1 TSEL0  
VLF PON  
STOP RESET  
bit 0  
{
D
E
F
Extension register TEST WADA USEL  
TE  
Flag register  
VDET  
VLOW  
UF  
TF  
AF  
AIE  
ICNT  
{
{
Control register  
TEST  
UIE  
TIE  
• TEST bit: This bit is used by manufacture for testing.  
Be sure to set this bit to "0". Be careful not to set this bit to "1" when writing to other bits of Reg-D.  
When CE pin goes to L, TEST is cleared .  
• WADA bit (WEEK Alarm / DAY Alarm)  
This bit sets either the WEEK alarm or the DAY alarm. When this bit is 0, the Reg-A is re-assigned to the  
WEEK alarm register. And when this bit is 1, the Reg-A is re-assigned to the DAY alarm register.  
• USEL bit (Update Interrupt Select)  
Specify the occurrence timing of time update interrupt.  
[Selection of timing for time update interrupt]  
USEL  
Timing  
Auto recovery time  
0
Update in seconds  
7.813 ms  
1
Update in minutes  
7.813 ms  
• TE bit (Timer Enable)  
When the TE bit is 0, The presetable counter loads the written data to the timer counter (It is initial value. ),  
and then stops the count down. And when the TE bit is 1, count down starts.  
DET ( Voltage Detect )  
• V  
When power supply is higher than VDET voltage, this bit shows 0. And when power supply is lower than  
VDETvoltage, this bit shows 1. But in this case, this bit continues keeping 1 till it is cleared by 0.  
This bit is not affected by another bits ( STOP, RESET ).  
LOW ( Voltage Low )  
• V  
When power supply is higher than VLOW voltage, this bit shows 0. And when power supply is lower than  
VLOW voltage, this bit shows 1. But in this case, this bit continues keeping 1 till it is cleared by 0.  
This bit is not affected by another bits ( STOP, RESET ).  
• AF bit, TF bit, and UF bit (Alarm Flag, Timer Flag, Update Flag)  
When the alarm occurs , the AF bit is set to 1. When the data is just zero, the TF (Timer Flag) of Reg-E is set  
to 1. At the end of time update, the UF bit is set. These data 1 is retained until writing over them with 0. You  
cannot write "1" over these bits.  
• AIE bit, TIE bit, and UIE bit (Alarm, Timer, Update Interrupt Enable)  
These bits control whether or not to generate interrupt signal from IRQpin, when alarm, timer, or time update  
interrupt event occurs. AIE corresponds to alarm interrupt, TIE corresponds to timer interrupt, and UIE  
corresponds to time update interrupt.  
• ICNT ( Invalid Counter Data )  
When crystal oscillation is stopped by for example down of supply voltage, this bit shows 1.  
But in this case, this bit continues keeping 1 till it is cleared by 0.  
This bit is not affected by another bits ( STOP, RESET ).  
• VLF (Voltage Low Flag)  
This bit shows the logic sum of each bit ( VLOW, ICNT, PON ). In this case, this bit continues keeping 1 till it  
is cleared by 0. This bit is not affected by another bits ( STOP, RESET ).  
• PON bit ( Power On Reset )  
When the initial power-up occurs, or device returns from a blackout or such as, this bit shows 1.  
And this case, this bit continues keeping 1 till it is cleared by 0.  
This bit is not affected by another bits ( STOP, RESET ).  
• STOP bit  
When this bit is set to "1", the operation of counting up the seconds in the Clock & Calendar circuitry is  
stopped, which stops the clock. When this bit is set to "0", the clock resumes its operation.  
• RESET bit  
When this bit is set 1, clock update was stop and clock data (except seconds digits) is reset for 00 year  
January 1day Sunday 00hour 00minutes. When CE terminal turned into L, this bit is cleared automatically.  
After using the RESET function, set the all clock and calendar data.  
Page - 8  
MQ - 402 - 01  
RX - 4591 CF  
8.3. Read/Write of data  
For both read and write, first set up chip condition (internally CE="H") to CE0="H" and CE1="H", then specify the  
4-bits address, and finally read or write in 8-bits units.  
Both read and write use MSB-first. In continuous operation, objected address is auto incremented.  
Auto incrementing of the address is cyclic, so address "F" is followed by address "0".  
8.3.1. Write of data  
1) One-shot writing  
C E  
CLK  
1
2
3
4
5
6
7
8
9
10  
11  
12  
13  
14  
15  
16  
D I  
0
0
0
0
A3 A2 A1 A0 D7 D6 D5 D4 D3 D2 D1 D0  
Address N Data N  
Mode  
D O  
Hi-Z  
2) Continuous writing  
C E  
CLK  
1
2
3
4
5
6
7
8
9
10  
11  
D I  
0
0
0
0
A3 A2 A1 A0 D7 D6 D5  
Address N  
D1 D0 D7 D6  
D1 D0 D7 D6  
D1 D0  
Mode  
Data N  
Data N+1  
Data N+m  
D O  
Hi-Z  
*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) One-shot reading  
C E  
CLK  
1
2
3
4
5
6
7
8
9
10  
11  
12  
13  
14  
15  
16  
D I  
1
0
0
0
A3 A2 A1 A0  
Address N  
Mode  
D O  
D7 D6 D5 D4 D3 D2 D1 D0  
Data N  
Hi-Z  
2) Continuous reading  
C E  
CLK  
1
2
3
4
5
6
7
8
9
10  
11  
D I  
1
0
0
0
A3 A2 A1 A0  
Address N  
Mode  
D O  
D7 D6 D5  
Data N  
D1 D0 D7 D6  
D1 D0 D7 D6  
D1 D0  
Hi-Z  
Data N+1  
Data N+m  
8.3.3. Write/Read mode setting code for each bank  
Mode  
Setup Code  
*In the mode setting code, if a value other than those listed is used, the  
subsequent data will be ignored and the DO pin remains in the Hi-z  
state.  
Read  
8 h  
Write  
0 h  
Page - 9  
MQ - 402 - 01  
RX - 4591 CF  
8.4. Alarm interrupt / Timer interrupt  
80.4.1. 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. Alarm data is compared when update occurs just in minutes digits.  
"1"  
"1"  
"1"  
AIE 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  
The day of the week, day, hour and minute can be set.  
WADA bit sets either the WEEK alarm or the DAY alarm. For the day of the week, multiple days can be set  
at one time. To avoid unintended hardware interrupt during the alarm setup, it is recommended that AIE bit  
be initially set to "0".  
Then, set up the alarm data, and apply zero clear to the AF flag in order to initialize (with certainty) the alarm  
circuitry. Afterward, set the AIE bit to "1". If you desire no hardware interrupt, 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.  
Write "0" to the AIE bit.  
Write "00h" to the MIN alarm register.  
Write "18h" to the HOUR alarm register.  
· Write tomorrow’s date to the WEEK/DAY alarm register.  
Write "1" to the WADA bit (selecting the DAY alarm).  
Clear the AF bit to zero.  
Write "1" to the AIE bit.  
2) Set the alarm to go off at 6 am every morning except Saturdays and Sundays.  
Write "0" to the AIE bit.  
Write "00h" to the MIN alarm register.  
Write "06h" to the HOUR alarm register.  
Write "3Eh" to the WEEK/DAY alarm register.  
Write "0" to the WADA bit (selecting the WEEK alarm).  
Clear the AF bit to zero.  
Write "1" to the AIE bit.  
Page - 10  
MQ - 402 - 01  
RX - 4591 CF  
8.4.2. Timer interrupt  
· If TIE="1" when interrupt occurs, the /IRQ pin outputs "L".  
· If TIE="0" when interrupt occurs, the /IRQ pin enters the high impedance state and the TF bit becomes "1", and  
remains so.  
"1"  
"0"  
TIE bit  
High impedance  
"L" level  
/IRQ output  
t RTN  
Auto return.  
"1"  
"0"  
TF bit  
Interrupt timing  
0 is written to the TF bit  
Automatic return  
The automatic return time (tRTN) is determined by the source clock specified in Reg-D.  
Source clock  
Automatic return time (tRTN)  
122  
4096 Hz  
µs  
64 Hz  
7.813 ms  
7.813 ms  
7.813 ms  
1 Hz  
Update in minutes  
• Timer measurement error  
Because the timer error is +0/-1 cycle time of the selected source clock, the timer time is following range.  
(Timer time( ). − Source clock period time ) to (Timer time.)  
) Timer time = Source clock cycle × Value of the timer counter.  
Now, the actual time of the timer is the above time, plus the communication duration of the serial data  
transfer clock.  
• Timer start timing  
In the data write mode, the timer starts counting from the rise edge of the CLK when writing to address D as  
shown in the following time chart.  
Address D  
CLK pin  
TSEL1 TSEL0  
TE  
0
0
DATA pin  
Internal timer  
/IRQ pin  
Timer operation  
• How to use the /IRQ pin is asserted low for generate the interrupt signal.  
At the cycle (source clock) specified in the timer interrupt setup register, the countdown starts from the value  
of the timer counter. When the data becomes zero, the /IRQ pin is asserted "L" for generate the interrupt  
signal. It can be used as an interval timer between a minimum of 1/4096 second to a maximum of 4095  
minutes. To avoid unintended hardware interrupt during the timer setup, setting both TF bit and TIE bit, in the  
beginning, is recommended.  
If you do not want to use any timer interrupt, set TIE bit to "0", and monitor the TF bit with software as  
required.  
Page - 11  
MQ - 402 - 01  
RX - 4591 CF  
8.6. Shifting to backup and returning  
DD  
V
CLK  
V
CD  
F
R
t
t
t
CU  
t
CE  
IL  
V
IL  
V
Backup  
Item  
Symbol  
tCD  
Condition  
Min.  
0
Typ.  
Max.  
Unit  
CE time before power drop  
-
-
-
-
µs  
µs/ V  
µs/ V  
µs  
Power drop time  
tF  
2
Power rise time  
tR  
tCU  
1
0
CE time after power rise  
* When RTC switch into the backup-mode, CE keeps low level sure and, set the RTC into a disable state.  
8.7. External connection example  
D 1  
Note  
4.7 µF  
DD  
V
Schottky  
Barrier  
Diode  
+
RX-4591  
VDD  
CE  
D I  
DO  
0.1 µF  
CLK  
/ IRQ  
FOUT  
FOE  
GND  
Note :  
Use the secondary battery or a lithium battery. If using the secondary battery, a diode is not necessary. If using a lithium  
battery, a diode is necessary. For information on resistance value, please consult the battery manufacturer.  
Page - 12  
MQ - 402 - 01  
RX - 4591 CF  
9. External dimension / Marking layout  
9.1. External dimensions  
RX - 4591 CF ( SON-10pin )  
• External dimensions  
• Recommended soldering pattern  
5.0 ± 0.2  
0.4  
1.0  
#10  
# 6  
0.26  
1.0  
0.6  
# 1  
# 5  
# 5  
0.1  
# 1  
4.6  
1.2 Max.  
Unit : mm  
9.2. Marking layout  
RX - 4591 CF ( SON-10pin )  
Logo  
Type  
E 4591  
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 - 402 - 01  
RX - 4591 CF  
10. Reference data  
(1) Example of frequency and temperature characteristics  
T = +25 C Typ.  
[Finding the frequency stability]  
θ
°
10-6  
×
= -0.035 10-6 Typ.  
×
α
1. Frequency and temperature characteristics can be  
approximated using the following equations.  
T = ( T - X)2  
0
∆f  
α θ  
θ
Frequency deviation in any  
temperature  
T
∆f  
-50  
-100  
-150  
α
1 / °C2)  
Coefficient of secondary temperature  
(−0.035±0.005) × 10-6 / °C2  
Ultimate temperature (+25 5 C)  
T
X
C)  
θ
θ
°
± °  
Any temperature  
°
C)  
-50  
0
+50  
+100  
2. To determine overall clock accuracy, add the frequency  
precision and voltage characteristics.  
Temperature [ C]  
°
T + fV  
∆f/f = ∆f/fo + ∆f  
∆
Clock accuracy (stable frequency) in any  
temperature and voltage  
∆f/f  
(2) Example of frequency and voltage characteristics  
Condition :  
Frequency precision  
∆f/fo  
3 V as reference, Ta=+25 °C  
+ 3  
Frequency deviation in any temperature  
Frequency deviation in any voltage  
T
V
∆f  
∆f  
0
3. How to find the date difference  
Date difference = ∆f/f × 86400 (seconds)  
* 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)  
(3-2) Current consumption when non-accessed (ii)  
when FOUT=32.768 kHz  
when FOUT=OFF  
Condition :  
Condition :  
Ta = +25 °C  
Ta = +25 °C  
1.0  
CE = GND  
10  
CE, FOE = GND  
FOE, / IRQ = VDD  
/ IRQ = VDD  
FOUT ; 32.768 kHz output ON  
FOUT ; Output OFF  
CL=30 pF  
0.5  
5
2
3
4
5
2
3
4
5
Supply Voltage VDD[V]  
Supply Voltage VDD[V]  
Page - 14  
MQ - 402 - 01  
RX - 4591 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 - 4591 CF  
( SON - 10pin )  
+260 °C Max.  
1
−
5 C / s  
− °  
+1 +5 °C / s  
+170 °C  
100 s  
Pre-heating area  
+220 °C  
35 s  
Stable Melting area  
+1 +5 °C / s  
time [ s ]  
In addition, please confirm the Notes of an individual specification.  
Page - 15  
MQ - 402 - 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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 		RX-0512D/P 1瓦SIP7和DIP14单和双输出[ 1 Watt SIP7 & DIP14 Single & Dual Output ] 3 页

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