Epson RX801SJ Instructions for use

ETM37E-06
Preliminary
Application Manua l
Real Time Clock Module
RX
8010SJ

NOTICE
•This 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 about applied circuitry, software, usage, etc. written in this material is intended for
reference only. Seiko Epson does not assume any liability for the occurrence of infringing on any
patent or copyright of a third party. This material does not authorize the licensing for any patent or
intellectual copyrights.
•When exporting the products or technology described in this material, you should comply with the
applicable export control laws and regulations and follow the procedures required by such laws and
regulations.
•You are requested not to use the products (and any technical information furnished, if any) for the
development and/or manufacture of weapon of mass destruction or for other military purposes. You
are also requested that you would not make the products available to any third party who may use the
products for such prohibited purposes.
•These products are intended for general use in electronic equipment. When using them in specific
applications that require extremely high reliability, such as the applications stated below, you must
obtain permission from Seiko Epson in advance.
/ Space equipment (artificial satellites, rockets, etc.) / Transportation vehicles and related
(automobiles, aircraft, trains, vessels, etc.) / Medical instruments to sustain life /
Submarine transmitters / Power stations and related / Fire work equipment and security
equipment / traffic control equipment / and others requiring equivalent reliability.
•All brands or product names mentioned herein are trademarks and/or registered trademarks of their
respective.

ETM37E Revision History
Rev No. Date Page Description
ETM37E-01 14.Jul.2013 Release
ETM37E-02 06.Sep.2013 28 Corrected a setting data of Flow chart Ex2
ETM37E-03 13.Sep.2013 1 Changed a 1. Overview.
5 Deleted contents of a 8.1 DC characteristics.
5 Corrected a fCLK to fSCL.
6 Changed a comment of 8.2.1. AC characteristics.
7 Deleted a comment of “Target spec”
7 Deleted a software command of TS sample.
20,21 Corrected a 13.3. Alarm interrupt Function.
28 Corrected a setting data of Flow chart Ex2
ETM37E-04 06.Nov.2013 4 Corrected a Item of 7. Frequency Characteristics
6 Corrected a caution of 8.2.1. AC characteristics(1)
ETM37E-05 13.Dec.2013 12 Changed a 12.2. Register table
34 Corrected a 13.8.7. The example of the communication
wave pattern
ETM37E-06 25.Sep.2014 7,26 Corrected a power-on reset procedure by the software
command.

RX8010 SJ
ETM37E-06
Contents
1. Overview........................................................................................................................1
2. Block Diagram ...............................................................................................................1
3. Terminal description .....................................................................................................2
4. External Dimensions......................................................................................................3
5. Absolute Maximum Ratings...........................................................................................4
6. Recommended Operating Conditions............................................................................4
7. Frequency Characteristics.............................................................................................4
8. Electrical Characteristics ..............................................................................................5
9. Matters that demand special attention on use................................................................7
10. Reference information .................................................................................................9
11. Application notes .......................................................................................................10
12. Overview of Functions and Description of Registers................................................11
12.1. Overview of Functions..................................................................................................................11
12.2. Register table ...............................................................................................................................12
12.3. Description of registers.................................................................................................................13
13. How to use.................................................................................................................15
13.1. Clock calendar explanation ..........................................................................................................15
13.2. Fixed-cycle Timer Interrupt Function............................................................................................15
13.3. Alarm Interrupt Function...............................................................................................................20
13.4. Time Update Interrupt Function....................................................................................................23
13.5. Frequency stop detection function ...............................................................................................25
13.6. FOUT function [clock output function] ..........................................................................................25
13.7. Flow-chart.....................................................................................................................................26
13.8. Reading/Writing Data via the I
2
C Bus Interface ...........................................................................31

RX8010 SJ
Page − 1 ETM37E-06
Low current consumption
SERIAL-INTERFACE REAL TIME CLOCK MODULE
RX8010 SJ
• Built in frequency adjusted 32.768-kHz crystal unit.
• Real-time clock function : Clock/calendar function,Long timer function, alarm interrupt function, etc.
• User RAM : Built in 128 bit RAM
• Frequency output function : 32.768 kHz, 1024 Hz, 1Hz
•Interface type : I
2
C-Bus
• Interface voltage range : 1.6 V∼ 5.5 V
•Timekeeper voltage range : 1.1 V ∼ 5.5 V
• Backup current consumption : 160 nA
Typ
/ 3 V
The I
2
C-Bus is a trademark of NXP Semiconductors.
1. Overview
This is a real-time clock module of the serial interface system that incorporates a 32.768 kHz crystal oscillator.
The real-time clock function incorporates not only a calendar and clock counter for the year, month, day, day of the
week, hour, minute, and second, but also a time alarm, interval timer, and time update interruption, among other
features.
All of these many functions are implemented in a thin, compact SOP package, which makes it suitable for various kinds
of small electronic devices.
2. Block Diagram
INTERRUPTS
CONTROLLER
ALARM REGISTER
/ IRQ1
BUS
INTERFACE
CIRCUIT
CONTROL
REGISTER
and
SYSTEM
CONTROLLER
DIVIDER CLOCK
and
SDA
USER RAM 128 bit
SCL
CALENDR
TIMER REGISTER
ALARM,TIMER,FOUT
BUILT-IN XTAL
( 32.768 kHz)
/ IRQ2
OSC
TIMER, FOUT

RX8010 SJ
Page − 2 ETM37E-06
3. Terminal description
3.1. Terminal connections
.
1.
N.C.
8.
V DD
2.
N.C.
7.
/ IRQ1
3.
/
IRQ2
6.
SCL
4.
GND
5.
SDA
SOP − 8pin
3.2. Pin Functions
Signal
name I/O Function
SCL Input This is a shift clock input pin for serial data transmission.
SDA Input/Output This is the data input/output pin for serial data transfer.
/ IRQ1 Output This pin outputs interrupt signals ("L" level) for alarm, timer, time update, and FOUT.
This is an N-ch open-drain output.
/ IRQ2 Output This pin outputs interrupt signals ("L" level) for timer and FOUT.
This is a C-MOS output.
V DD Supply
This is a power-supply pin.
GND Supply
This pin is connected to a ground.
Note: Input pins are able to input up to 5.5V regardless of V DD applied voltage.
Note: Open drain pins are able to Pull-up to 5.5V regardless of V DD applied voltage.
Note: Connect a bypass capacitor rated at least 0.1µF between power supply pins and GND pin.

RX8010 SJ
Page − 3 ETM37E-06
4. External Dimensions
4.1. External Dimensions
RX8010SJ (SOP − 8pin )
•External dimensions
Unit : mm
7.0 ± 0.2
6.0 ± 0.2
#5 #8
#1
1.27 0.4
3.9 ± 0.1
#4
0.6
0.22
0°- 8°
2.65 Max.

RX8010 SJ
Page − 4 ETM37E-06
5. Absolute Maximum Ratings
GND =0V
Item Symbol Condition Rating Unit
Supply voltage V DD Between V DD and GND −0.3
∼
+6.5 V
Input voltage V IN SCL,SDA −0.3
∼
+6.5 V
Output voltage 1 V OUT1 /IRQ2 −0.3
∼
V DD +0.3 V
Output voltage 2 V OUT2 SDA, /IRQ1
−0.3 ∼
+6.5 V
Storage temperature T STG
When stored separately,
without packaging
−55
to +125 °C
6
.
Recommended Operating
*Unless otherwise specified, GND =0V,Ta =−40 °Cto +85 °C
Item Symbol Condition Min. Typ. Max. Unit
Operating supply voltage V ACC - 1.6 3.0 5.5 V
Clock supply voltage V CLK - 1.1 3.0 5.5 V
Low voltage detection V LOW - 1.10 V
Applied voltage when OFF V PUP SDA, /IRQ1pin 5.5 V
Operating temperature T OPR No condensation −40 +25 +85 °C
∗Minimum value of Clock supply voltage V CLK is the timekeeping continuation lower limit value that initialized RX8010 in operating
supply voltage V ACC .
7. Frequency Characteristics
*Unless otherwise specified, GND =0V,Ta =−40 °Cto +85 °C
Item Symbol Condition Min. Typ. Max. Unit
Output frequency fo 32.768
(Typ. )
kHz
Frequency stability
∆ f/f Ta =+25 °C
V DD =3.0 V 5± 23
(∗1)
× 10
−6
Frequency/voltage
characteristics f/V Ta =+25 °C
V DD =1.2 V ∼ 5.5 V −2 +2 × 10
−6
/V
Frequency/temperatur
e characteristics Top Ta =−20 °C∼ +70 °C
V DD =3.0 V;+25 °C reference −120 +10 × 10
−6
Oscillation start time t STA
Ta =±0°C∼ +50 °C
V DD =1.6 V ∼ 5.5 V 1.0 s
Ta =−40 °C∼ +85 °C
V DD =1.6 V ∼ 5.5 V 3.0 s
Aging fa Ta =+25 °C,V
DD =3.0 V;first year −5 +5 × 10
−6
/year
∗1 )
The monthly error is equal to one minute. ( excluding offset )

RX8010 SJ
Page − 5 ETM37E-06
8. Electrical Characteristics
8.1. DC characteristics
*Unless otherwise specified, GND =0V,Ta =−40 °Cto +85 °C
8.1.1. DC characteristics (1)
* Unless otherwise specified, GND = 0V,V DD =1.6 V∼ 5.5 V,Ta =−40 ° C ∼ +85 ° C
Item Symbol Condition Min. Typ. Max. Unit
Current
consumption (1)
I DD1 Input pins are "L"
f SCL = 0 Hz, /IRQ1,2 = OFF
TSEL2=”1”
V DD =5V
350
nA
Current
consumption (2)
I DD2 V DD =3V
160 320
nA
Current
consumption (3)
I DD3 f
SCL = 0 Hz, /IRQ2 =OFF,
/IRQ1 :32.768 kHz ON
V DD =5V 0.60 1.10 µA
Current
consumption (4)
I DD4 V
DD =3V 0.52 0.90
Current
consumption (5)
I DD5 f
SCL = 0 Hz, /IRQ1 =OFF,
/IRQ2 :1024 Hz ON ,
C L =15 pF
V DD =5V 0.45 1.10 µA
Current
consumption (6)
I DD6 V
DD =3V 0.40 0.90
High-level
input voltage V
IH SCL,SDA pin 0.8 ×V
DD
5.5 V
Low-level
input voltage V
IL SCL, SDA pin GND −0.3 0.2 ×V
DD
V
High-level
output voltage
V OH1 /IRQ2 pin V
DD =5 V, I OH =−1 mA 4.5 5.0 V
V OH2 V
DD =3 V, I OH =−0.5 mA
2.7 3.0
Low-level
output voltage
V OL1 /IRQ2 pin V DD =5 V, I OL =1 mA GND GND +0.5
V
V OL2 V DD =3 V, I OL =0.5 mA GND GND +0.3
V OL4 /IRQ1 pin V DD =5 V, I OL =1 mA GND GND
+0.25 V
V OL5 V DD =3 V, I OL =1 mA GND GND +0.4
Input
leakage current
I LK Input pin, V
IN =V DD or GND −0.1 0.1 µA
Onput
leakage current
I OZ Input pin, V
OUT =V DD or GND −0.1 0.1 µA

RX8010 SJ
Page − 6 ETM37E-06
8.2. AC characteristics
8.2.1. AC characteristics(1)
* Unless otherwise specified, GND = 0V,V DD =1.6 V∼ 5.5 V,Ta =−40 ° C ∼ +85 ° C
Item Symbol
Standard-Mode
(f SCL =100kHz) Fast-Mode (f SCL =400kHz) Unit
Min. Max. Min. Max.
SCL clock frequency f
SCL 100 400 kHz
Start condition setup time t
SU;STA 4.7 0.6 µs
Start condition hold time t
HD;STA 4.0 0.6 µs
Data setup time t
SU;DAT 250 100 ns
Data hold time t
HD;DAT 0 0 ns
Stop condition setup time t
SU;STO 4.0 0.6 µs
Bus idle time between
start condition and stop condition t
BUF 4.7 1.3 µs
Time when SCL = "L" t
LOW 4.7 1.3 µs
Time when SCL = "H" t
HIGH 4.0 0.6 µs
Rise time for SCL and SDA t
r 1.0 0.3 µs
Fall time for SCL and SDA t
f 0.3 0.3 µs
Allowable spike time on bus t SP 50 50 ns
• Timing chart
t
HD ; DAT
t
SU ; DAT
t
HD ; STA
t
LOW
t
HIGH
1/ f
SCL
t r t f
t
SU ; STA
SDA
SCL
START
CONDITION
(S)
BIT 7
MSB
(A7)
BIT 6
(A6)
ACK
(A)
Protocol
t
BUF
t
SU ; STO
STOP
CONDITION
(P)
START
CONDITION
(S)
(P)
(A)
t
HD ; STA
t
SU ; STA
(S)
BIT 0
LSB
(R/W)
(S)
t
SP
Caution: When communication of I
2
C-bus is started, consumption electric currents increase.
When accessing this device, all communication from transmitting the start condition to transmitting the stop
condition after access should be completed within 0.95 seconds.
If such communication requires 0.95 seconds or longer, the I
2
C bus interface is reset by the internal bus
timeout function.
8.2.2. AC characteristics (2)
* Unless otherwise specified, GND = 0V,V DD =1.6 V∼ 5.5 V,Ta =−40 ° C ∼ +85 ° C
Item Symbol Condition Min. Typ. Max. Unit
FOUT symmetry (/IRQ2) SYM 50% V DD Level 40 50 60 %