Overview; Block Diagram - Epson RA8804 CE Applications Manual

RA8804 CE
2
I C-Bus Interface Real-time Clock Module
RA8804
 Features built-in 32.768 kHz DTCXO.
 Supports I 2
C-Bus's high speed mode (Up to 400 kHz)
 Time -Stamp function with EVIN-Pin trigger.
 Outputs to SOUT-Pin of each of detection Flag or others.
 Alarm interrupt function for day, date, hour, and minute settings
 Fixed-cycle timer interrupt function
 Time update interrupt function
 Temperature compensated 32.768 kHz output with OE function
 Auto correction of leap years
 Wide interface voltage range: 1.6 V to 5.5 V
 Wide time-keeping voltage range:1.5 V to 5.5 V
 Low current consumption: 0.35 µA / 3.0 V (Typ.)
 AEC-Q100 compliant for automotive applications

1. Overview

This module is an I2C 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, 32.768 kHz output function, Time-stamp function with EVIN-pin trigger,
and. Programmable output function to SOUT-pin of detection Flag or others.
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
/ INT
FOE
FOUT
SOUT
EVIN
SCL
SDA
CE
( 32.768 kHz )
DTCXO
DIVIDER
POWER
CONTROLLER
INTERRUPTS
CONTROLLER
FOUT
CONTROLLER
SOUT
CONTROLLER
VDD
EVENT DETECTION
CONTROLLER
BUS
INTERFACE
CIRCUIT
244.14 µs to 32 years
(Seconds, minutes)
(FOE and FOUT pins)
(from 2000 to 2099)
CLOCK
and
CALENDR
TIMER REGISTER
ALARM REGISTER
CONTROL
REGISTER
CAPTURE
BUFFER
SYSTEM
CONTROLLER
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