RX8804CE :I²C-Bus Interface Real Time Clock Module
(Built-in 32.768 kHz-DTCXO)

Built in frequency adjusted 32.768 kHz crystal unit and DTCXO.
Interface Type
I²C-Bus interface (400kHz)
Interface voltage range
1.6 V to 5.5 V
Temp. compensated voltage range
1.5 V to 5.5 V
Clock supply voltage range
1.5 V to 5.5 V
Selectable clock output(32.768 kHz, 1024 Hz, 1 Hz)
The various functions full calendar, alarm, timer, event detection
The time-stamp synchronizing to the event detection of EVIN-pin
The SOUT-pin outputs that selected flag bit value
Video contents: RX8804CE, RA8804CE SOUT Function
Applications : handy equipment , outdoor unit , industrial machine
Epson prepared Linux driver and evaluation board for development
https://www5.epsondevice.com/en/information/support/linux_rtc/
The registered trademark Linux® is used pursuant to a sublicense
from LMI(Linux Mark Institute)
https://www5.epsondevice.com/en/information/support/rtc_evaboard/
Links to Driver and Video contents
Click here

RX8804CE

Design Support Data Download

Block diagram

Overview

Stability
- XA
  ± 3.4 x 10^-6 / -40 °C to +85 °C ( Equivalent to ±9 seconds of month deviation )
  ± 8.0 x 10^-6 / +85 °C to +105 °C ( Equivalent to ±21 seconds of month deviation )
- XB
  ± 5.0 x 10^-6 / -40 °C to +85 °C ( Equivalent to ±13 seconds of month deviation )
  ± 8.0 x 10^-6 / +85 °C to +105 °C ( Equivalent to ±21 seconds of month deviation )
32.768 kHz frequency output function
- FOUT pin output (C-MOS output), CL = 30 pF
- Output selectable: 32.768 kHz, 1024 Hz, 1 Hz
Event detection function
- when trigger input to EVIN-pin or specified by program, time and date is recorded.
  The EVIN-pin with pull-up resistor that is releasable.
Timer function
- Timer source clock are 1min., 1sec., 64Hz, 4096Hz.
- 24-bit-presettable counter (244µs to about 32years(280320h).
Alarm function
- Alarm function can be set to day of week, day, hour, and minute.
Internal state output function
- SOUT pin output (C-MOS output).
- it outputs selected flag-bit value or specified value(H or L).

Specifications (characteristics)

name

Pin function

Signal Name	I / O	Function
SOUT	Output	Internal state output pin./td>
SCL	Input	Serial clock input pin
FOUT	Output	The pin outputs the reference clock signal ( CMOS output )
EVIN	Input	Event input pin
V_DD	-	Connected to a positive power supply
FOE	Input	The input pin for the FOUT output control
/ INT	Output	Interrupt output (N-ch. open drain)
GND	-	Connected to a ground
T2	-	Use only for testing in the factory ( Do not connect externally )
SDA	I/O	Data input and output pin

Terminal connection/External dimensions

Terminal connection External dimensions

(Unit: mm)

Footprint (Recommended)

footprint

(Unit: mm)

To maintain stable operation, provide a 0.1uF by-pass capacitor
at a location as near as possible to the power source terminal of the crystal product (between Vcc - GND).