Overview; Block Diagram - Epson RX8804CE Applications Manual

RX8804CE
2
I C-Bus Interface Real-time Clock Module
RX8804
• Built-in 32.768 kHz DTCXO
• Interface Type
• Low current consumption at backup
• Wide time-keeping voltage range
• Wide interface voltage range
• SOUT can output self monitoring status, voltage down etc.
• Time stamp function of Seconds from Year
• EVIN is equipped for time stamp trigger
• Alarm interrupt function
• Wakeup timer interrupt function
• Time update interrupt function
• Temperature compensated 32.768 kHz or other output
• Auto correction of leap years
2
The I C-Bus is a trademark of NXP Semiconductors

1. Overview

2
This module is an I 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, wakeup 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 interrupt Flags or self monitoring Flags.
The devices in this module are fabricated via a CMOS process for low current consumption, which enables long-
term battery back-up.

2. Block Diagram

V
DD
/INT
FOE
FOUT
SOUT
EVIN
SCL
SDA
Figure 1 Block Diagram
CE
( 32.768 kHz )
DTCXO
DIVIDER
POWER
CONTROLLER
INTERRUPTS
CONTROLLER
FOUT
CONTROLLER
SOUT
CONTROLLER
VDD
EVENT DETECTION
CONTROLLER
BUS
INTERFACE
CIRCUIT
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: I C-Bus (Up to 400 kHz)
: 350 nA / 3.0 V Typ.
: 1.5 V to 5.5 V
: 1.6 V to 5.5 V
: SOUT can output programmed H / L level also.
: One time recorded by trigger of EVIN.
: It has connectable pull up resistor
: Combination of Day, Date, Hour, Minute, and AE bit
: Auto repeated 244.14 µs to 32 years
: Every second or every minute
: Available output enable control
: Writing of "60 seconds" is available for Leap Second
adjustment
CLOCK
and
CALENDR
TIMER REGISTER
ALARM REGISTER
CONTROL
REGISTER
CAPTURE
BUFFER
SYSTEM
CONTROLLER
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