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Page - 1 MQ372-02
I
2
C-Bus Interface Real-time Clock Module
RX
-
8581
SA
/
JE
/
NB
• Features built-in 32.768-kHz crystal oscillator, frequency adjusted
• Supports I
2
C-Bus's high speed mode (400 kHz)
• Alarm interrupt function for day, date, hour, and minute settings
• Fixed-cycle timer interrupt function
• Time update interrupt function
(Seconds, minutes)
• 32.768-kHz output with OE function
(FOE and FOUT pins)
• Auto correction of leap years
(from 2000 to 2099)
• Wide interface voltage range: 1.8 V to 5.5 V
• Wide time-keeping voltage range:1.6 V to 5.5 V
• Low current consumption: 0.45
µ
A /3 V (Typ.)
• Compact package (NB: SON−22 pin PKG)
The I
2
C-Bus is a trademark of PHILIPS ELECTRONICS N.V.
1. Overview
This module is an I
2
C bus interface-compliant real-time clock which includes a 32.768-kHz crystal oscillator.
In addition to providing a calendar (year, month, date, day, hour, minute, second) function and a clock counter
function, this module provides an abundance of other functions including an alarm function, fixed-cycle timer
function, time update interrupt function, and 32.768-kHz output 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 thin, compact SON package, which makes it suitable for
various kinds of mobile telephones and other small electronic devices.
2. Block Diagram
CLOCK
and
CALENDAR
TIMER
REGISTER
ALARM
REGISTER
FOUT
CONTROLLER
CONTROL
REGISTER
and
SYSTEM
CONTROLLER
DIVIDER
INTERRUPT
CONTROLLER
I
2
C-BUS
INTERFACE
CIRCUIT
OSC
32.768 kHz
FOUT
FOE
/ INT
SCL
SDA