Overview; Block Diagram - Epson RA8900SA/CE Applications Manual

RA8900 SA / CE
2
For automotive I
RA8900
 Features built-in 32.768 kHz DTCXO, High Stability.
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 Supports I
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
 32.768 kHz output with OE function
 Auto correction of leap years
 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
 Built-in Backup switchover circuit
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The I C-BUS is a trademark of NXP Semiconductors.
*This product is on development. This specification may be changed until it releases.

1. Overview

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This module is an I
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, RA8900 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

VDD
VBAT
/ INT
FOE
FOUT
SCL
SDA
C-Bus Interface Real-time Clock Module
SA / CE
(Seconds, minutes)
(FOE and FOUT pins)
(from 2000 to 2099)

A / 3 V (Typ.)
C bus interface-compliant real-time clock which includes a 32.768 kHz DTCXO.
( 32.768 kHz )
DTCXO
INTERRUPTS
FOUT
DIVIDER
CLOCK
CALENDR
POWER
CONTROLLER
TIMER REGISTER
CONTROLLER
ALARM REGISTER
CONTROLLER CONTROL
REGISTER
and
BUS
SYSTEM
CONTROLLER
INTERFACE
CIRCUIT
Page - 1
and
ETM44E-01