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RX8111CE
Low Power Real-time Clock Module with I
RX8111CE
• Built-in frequency adjusted 32.768 kHz crystal unit
• Interface Type
• Low current consumption at backup: 100 nA / 3.0 V Typ.
• Wide operating voltage range
• Wide time-keeper voltage range
• Auto power switching function
• Time stamp function
• Time stamp memory can be used as users memory; 512 bit, 64 word 8 bit
• Alarm interruption
• The various functions include full calendar, seconds alarm, wakeup timer, and 32.768 kHz output
• Self monitoring function
1. Overview
RX8111CE is a real-time clock module with integrated 32.768 kHz crystal oscillator and I
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, wakeup timer, time update interruption, and 32.768 kHz output. Time stamp
function can record maximum of 8 events. Using the backup battery charge control function and the interface power supply
input pin, RX8111CE 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
2
: I
C (up to 400 kHz)
: 1.6 V to 5.5 V
: 1.1 V to 5.5 V
: Automatically switches to backup power supply
by monitoring the V
: 8times time-stamp,1/256 seconds with many selectable trigger.
: Day, date, hour, minute, second
: Voltage detection, Crystal oscillation stop, etc.
V
BAT
V
BAT
（V
Detector
CMP
（V
）
LOW
RTC Main Circuit
32.768kHz
OSC
32kHz
to
1kHz
Divider
GND
2
C Interface and Time Stamp Function
voltage.
DD
2
The I
C-Bus is a trademark of NXP Semiconductors.
V
OUT
Power
Control
V
Detector
）
Bus
Register
Control
Interface
(System
Control)
Timer
Register
Event
Controller
Interrupts
Controller
512Hz
Clock
to
and
1Hz
Calendar
Divider
User RAM
FOUT Controller
Figure 1 Block Diagram
Page − 2
2
C interface. In addition to
V
DD
DD
(V
)
DET
V
IO
I/O
SCL
SDA
EVIN
/INT
Alarm,Timer,
Update,Event
FOUT
FOUT,
Timer
ETM61E-01
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