RTC - 8564 JE/NB
Page - 1
MQ - 322 - 04
I
2
C-Bus Interface Real Time Clock Module
RTC - 8564 JE/NB
•
Built-in crystal oscillator running at 32.768 kHz
•
Compliant with I
2
C high-speed bus specifications ( 400 kHz )
•
Equipped with alarm, timer, and frequency output ( 32.768 kHz, 1024 Hz, 32 Hz, 1 Hz ) features
•
Inclusion of century bit to enable correct date even after year 2000
•
Wide range of interface voltage between 1.8 V and 5.5 V
•
Wide range of clock voltage between 1.0 V and 5.5 V ( Ta=
−
20
°
C to +70
°
C )
•
Low power consumption at 275 nA / 3.0 V (Typ.)
The I
2
C-BUS is a trademark of PHILIPS ELECTRONICS N.V.
1. Overview
This module is a serial interface real time clock that has a built-in crystal oscillator.
The module offers many functions such as calendar clock, alarm, and timer. All of them can be controlled with
a two (2) lines interface. Also, the regular frequency output can be selected from programs.
Because this module has multiple features packaged in the same surface, it is ideally suited for applications
such as mobile phones, handy terminals or other small electronic systems.
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
