Epson RX-8564LC Page −, ETM12E-01

RX − 8564 LC

Low power consumption / Small size thin model package

I2C-Bus Interface Real Time Clock Module

RX − 8564 LC

•Built in frequency adjusted 32.768 kHz crystal unit.

•	Interface type	: 400 kHz two-wire I2C-bus interface
•	Wide operating voltage range	: 1.8 V	to 5.5 V
•	Wide timekeeper voltage range	: 1.0 V	to 5.5 V ( at Ta = +25 ° C )
•	Low backup current	: 275 nA ( Typ. ) / 3 V
•	32.768-kHz clock frequency output	: C-MOS output with output control

•Real-time clock function

Clock/calendar function, auto leap year correction function, alarm interrupt function, etc.

The I2C-BUS is a trademark of PHILIPS ELECTRONICS N.V.

1. Overview

This module is an I2C bus interface real-time clock that has bult-in 32.768-kHz crystal oscillator.

In addition to a calendar (year, month, day, weekday, hour, minute, second) function and a clock counter function, this module's real-time clock functions include an alarm function and a fixed-cycle timer interrupt function.

The devices in this module are fabricated via a C-MOS process for low current consumption, which enables long-term battery back-up.

All of these many functions are implemented in a compact package, which makes it suitable for various kinds of mobile telephones, handy terminals and other small electronic devices.

2. Block diagram

	32.768 kHz		Control 1	00
	CRYSTAL
	OSC	Voltage Detector	Control 2
			Seconds
			Minutes
CLKOUT	OUTPUT		Hours
		DIVIDER	Days
CLKOE	CONTROL
			Weekdays
			Month / Century
			Years
/ INT		CONTROL	Minutes Alarm
		LOGIC	Hour Alarm
SCL	I2C-BUS		Day Alarm
SDA	INTERFACE		Weekday Alarm
		ADDRESS	CLKOUT frequency
			Timer Control
		REGISTER
	POR		Timer	0F

Page − 1 ETM12E-01