RTC – 4553AC
Page - 1
MQ - 342 - 01
Real-Time Clock Module
RTC – 4553AC
•
Designed for E-mater
•
Built-in 32.768 kHz quartz crystal allows adjustment- free operation and assures high accuracy
•
Integrated clock (hours, minutes, seconds) and calendar (year, month, day, day of the week) counter
•
Automatic leap year compensation until 2099
•
Selectable 24-hour/12-hour display mode (with AM/PM indication)
•
Clock data modification using increment method
•
Clock data serial output in BCD format
•
Software controlled 30 second adjustment
•
Selectable 1/10 Hz or 1024 Hz timing pulse output
•
Built-in SRAM (30
×
4 bit)
•
Constant voltage drive realizes low power consumption (1
µ
A Typ.)
and minimizes voltage-induced frequency fluctuations
•
Supports low-voltage operation (3 V)
1. Overview
The RTC-4553 is a very compact real-time clock module with permanent calendar and serial data
input/output. The module is designed for E-mater; time accuracy is within ±5
×
10
-6
(±0.432 sec./day).
It incorporates a heat-resistant 32.768 kHz quartz oscillator. The space saving package allows high-density
mounting and facilitates automated production.
Besides the clock and calendar functions (comprising all items from years to seconds), the RTC-4553
incorporates also a 30
×
4 bit SRAM and offers other useful features.
The use of a CMOS IC makes possible low-voltage, low-power operation, to ensure proper timekeeping
also when powered from a backup battery.
2. Block Diagram
Year
Mon.
Day
Hou.
Day
of
week
Min.
Control circuit
Shift controller
Input
controller
Output controller
Control
register
3
RAM
(120bit)
Control
register
2
Control
register
1
Output
controller
32.768 kHz
OSC
Counter
Sec.
TP
OUT
WR
CS
0
CS
1
SCK
S
IN
S
OUT
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