Epson RX8900SA/CE - 1. Overview; 2. Block Diagram

RX8900 SA / CE
Page - 1 ETM45E-01
I
2
C-Bus Interface Real-time Clock Module
RX8900 SA / CE
 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: 2.5 V to 5.5 V
 Wide time-keeping voltage range:1.6 V to 5.5 V
 Low current consumption: 0.70
A / 3 V (Typ.)
 Built-in Backup switchover circuit
The I
2
C-BUS is a trademark of NXP Semiconductors.
*This product is on development. This specification may be changed until it releases.
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. By the battery backup switchover
function and the interface power supply input pin, RX8900 can support various power supply circuitries.
The devices in this module are fabricated via a C-MOS process for low current consumption, which enables
long-term battery back-up.
2. Block Diagram
I NTERRUPT S
CONTROLLER
A
LARM REGI STE
R
/ IN
T
BU S
INTERF ACE
CIRCUI T
( 3 2. 768 kHz )
CONTROL
REGISTER
and
SYSTE
M
CONTROL LE
R
DIVI DER
CLOCK
POWER
CONTROLLE
R
and
SDA
VDD
SCL
C
ALEND
R
TI M E
R
REGI STE
R
DTCXO
VB A
T
CONTROLLE
R
FOUT
FOUT
FOE