RX-8035SA (I²C-Bus Real Time Clock Module)

Built in 32.768 kHz crystal unit
Frequency adjusted for high accuracy.

(±5x10^-6/Ta=+25°C)
Interface Type
I²C-Bus Interface(400kHz)
Operating voltage range
2.4V to 5.5V
Wide voltage for Timekeeping
1.0V to 5.5V
Low backup current
350nA(SA) 400nA(LC)/ 3V(Typ.)
Event detection and Time stamp
One-shot full timestamp and interrupt.
Dual event detection ports
Each terminal has a de-bounce circuit.
Auto power switching functions
It switches VDD and VBAT, automatically
Dual Alarm, Periodic interruption
Epson prepared Linux driver for development
https://www5.epsondevice.com/en/information/support/linux_rtc/
The registered trademark Linux® is used pursuant to a sublicense from LMI(Linux Mark Institute)

RX-8035SA

Application Manual
(ETM35E-11) (1.3MB)

Design Support Data Download

Footprint Data

Block diagram

Overview

The event detection and Timestamp function
- Dual event detection terminals.
- Selectable de-bounce period 35ms or 2s.
- Available event detection interrupt output.
Power switching functions.
- An external diode is unnecessary to have a reverse current prevention switch built-in in
  the VBAT side to connect a primary cell to.
- When VDD is less than 2.4V, an internal source is switched to VBAT, and /RES is Low level.
  When VDD voltage rises to higher than 2.52V, an internal source is switched to VDD, and /RES is released with 105ms delay.
- Note: When the supply from VBAT, SCL and SDA are disabled.
Alarm, Periodic interrupt, 32.768kHz clock output.
- Available monthly-alarm and weekly-alarm.
- Interrupt period are selectable from 2Hz to Monthly.
- CLKOUT outputs 32.768kHz clock powered by VDD.

Specifications (characteristics) *Refer to application manual for details.

Recommend Operating Conditions

Item	Symbol	Conditions	Min.	Typ.	Max.	Unit
Operating voltage	V_ACCESS	VDD	2.4	3.0	5.5	V
Time keeping voltage	V_CLK	VBAT	1.0	3.0	5.5	V
Operating temperature	T_OPR	-	-40	+25	+85	°C
Storage temperature	T_STG	-	-55	-	+125	°C

Frequency characteristics

Item	Symbol	Conditions	Rating	Unit
Frequency tolerance	Δ f/f	Ta=+25°C V_BAT=3.0V	B: 5±23 ^1 AA: 5±5 ^2 AC: 0±5 ^*2	×10^-6
Oscillation start-up time	t_STA	Ta=+25°C V_DD=3.0V	1 Max.	s
Frequency/voltage characteristics	f/V	Ta = +25°C V_DD=2.4V to 5.5V	±1 Max.	×10^-6

*1 Equivalent to ±1 minute of monthly deviation (excluding offset.)
*2 Equivalent to ±13 seconds of monthly deviation (excluding offset.)

Current consumption characteristics

Ta=-40°C to +85°C

Item	Symbol	Conditions	Min.	Typ.	Max.	Unit
Current Consumption	l_BAT	RX-8035SA VBAT=3.0V, VDD=0.0V SCL=SDA=GND	-	350	1200	nA
	l_BAT	RX-8035LC VBAT=3.0V, VDD=0.0V SCL=SDA=GND	-	400	1200	nA
	I_DD	VDD=3.0V SCL=SDA=GND CLKOUT=open	-	1.40	2.50	µA

Power supply detection voltage

Ta=-40°C to +85°C

Item	Symbol	Condition	Min.	Typ.	Max.	Unit
VBAT detect voltage	VLOW	-	1.10	1.25	1.40	V
Power switching voltage　 (VDD to VBAT)	V_D2B	+25°C	2.328	2.40	2.472	V

name

Pin function

Signal Name	Input/Output	Functions
SCL	Input	I2C serial clock.
SDA	In/Out	I2C data in/out.
VDD	-	Main power supply.
VBAT	-	Power supply for backup.
Vout	Output	Switched power out.(maximum output current 20mA)
/ RES	Output	VDD voltage state.
GND	-	Ground
EVIN1	Input	Event detection input 1
EVIN2	Input	Event detection input 2
/ INTA	Output	Interrupt out A.
/ INTB	Output	Interrupt out B.
CLKOUT	Output	32.768kHz output. (CMOS. Can not inhibit.)
N.C.	-	Do not connect.

Terminal connection / External dimensions

Terminal connection External dimensions

(Unit: mm)

The metal case inside of the molding compound may be exposed on the top or bottom of this product.
This purely cosmetic and does not have any effect on quality, reliability or electrical specs.

Footprint (Recommended)

footprint