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RX − 8564 LC
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ETM12E-01
Low power consumption / Small size thin model package
I
2
C-Bus Interface Real Time Clock Module
RX
−
−−
−
8564
LC
• Built in frequency adjusted 32.768 kHz crystal unit.
• Interface type : 400 kHz two-wire I
2
C-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 I
2
C-BUS is a trademark of PHILIPS ELECTRONICS N.V.
1. Overview
This module is an I
2
C 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
Control 1
Seconds
Minutes
Hours
Days
Month
/
Century
Control 2
Weekdays
Years
Minutes Alarm
Hour Alarm
Day Alarm
Weekday Alarm
Timer Control
CLKOUT frequency
Timer
00
0F
OUTPUT
CONTROL
CONTROL
LOGIC
POR
OSC
32.768 kHz
CRYSTAL
CLKOUT
CLKOE
DIVIDER
Voltage Detector
ADDRESS
REGISTER
I
2
C-BUS
INTERFACE
/ INT
SCL
SDA