RX − 8801 SA / JE
Page - 1 ETM26E-03
I
2
C-Bus Interface Real-time Clock Module
RX − 8801 SA / JE
• Features built-in 32.768 kHz DTCXO, High Stability.
• 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: 2.2 V to 5.5 V
• Wide time-keeping voltage range:1.6 V to 5.5 V
• Low current consumption: 0.8
μA / 3 V (Typ.)
The I
2
C-BUS is a trademark of NXP Semiconductors.
1. Overview
This module is an I
2
C bus interface-compliant real-time clock which includes a 32.768 kHz DTCXO.
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 SOP-14 pin and VSOJ-20 pin package.
2. Block Diagram
32kHz
DTCXO
32.768 kHz
CLOCK
and
CALENDAR
TIMER
REGISTER
ALARM
REGISTER
FOUT
CONTROLLER
CONTROL
REGISTER
and
SYSTEM
CONTROLLER
DIVIDER
INTERRUPT
CONTROLLER
I
2
C-BUS
INTERFACE
CIRCUIT
FOUT
FOE
/ INT
SCL
SD
