1. Overview
RX4111CE
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ETM62E-02
Seiko Epson Corporation
5
Built-in frequency adjusted 32.768 kHz crystal unit
Interface Type : SPI-Bus 4 wire, 4 MHz Max.
Low current consumption at backup
: 100 nA Typ. / 3.0 V
Wide operating voltage range : 1.6
V
to
5.5
V
Wide time-keeper voltage range : 1.1
V
to
5.5
V
Auto power switching function : Automatically switches to backup power supply
by monitoring the V
DD
voltage.
Time stamp function : 8 times time-stamp,1/256 seconds with many selectable trigger.
Time stamp memory can be used as users memory; 512 bit, 64 word x 8 bit
Alarm interruption : Day, date, hour, minute, second
The various functions include full calendar, seconds alarm, wake-up timer, and 32.768 kHz output
Self monitoring function : Voltage detection, Crystal oscillation stop, etc.
1. Overview
RX4111CE is a real-time clock module with integrated 32.768 kHz crystal oscillator and SPI-Bus interface. In addition to
providing a calendar (year, month, date, day, hour, minute, second), this module provides other functions including time-
stamp from 1/1024 second to year, alarm, wake-up timer, time update interruption, and 32.768 kHz output. Time stamp
function can record maximum of 8 events. Using the backup battery switch control function and the interface power supply
input pin, RX4111CE can support various power supply circuits. All of the functions mentioned above are offered in a thin
and compact 3.2 x 2.5 ceramic package which could be used in various applications requiring small footprints.
2. Block Diagram
FOUT
V
BAT
GND
Bus
Interface
Register
Control
(System
Control)
RTC Main Circuit
32 kHz
to
1 kHz
Divider
512 Hz
to
1Hz
Divider
Clock
and
Calendar
CLK
CE
V
DD
V
IO
(V
DET
)
V
DD
Detector
OSC
32.768 kHz
Timer
Register
Interrupts
Controller
/INT
User RAM
Event
Controller
I/O
internal
V
DD
DI
DO
Alarm, Timer,
Update, Event
FOUT,
Timer
FOUT Controller
Figure 2 Block Diagram
Low Power Real Time Clock Module with SPI-Bus Interface and Time Stamp Function
RX4111CE
