Low Power Real-time Clock Module with I
2
C Interface and Time Stamp Function
• Built-in frequency adjusted 32.768 kHz crystal unit
• Interface Type : I
2
C (up to 400 kHz)
• Low current consumption at backup: 100 nA / 3.0 V Typ.
• 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 : 8times time-stamp,1/256 seconds with many selectable trigger.
• Time stamp memory can be used as users memory; 512 bit, 64 word 8 bit
• Alarm interruption : Day, date, hour, minute, second
• The various functions include full calendar, seconds alarm, wakeup timer, and 32.768 kHz output
• Self monitoring function : Voltage detection, Crystal oscillation stop, etc.
The I
2
C-Bus is a trademark of NXP Semiconductors.
1. Overview
RX8111CE is a real-time clock module with integrated 32.768 kHz crystal oscillator and I
2
C 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, 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
Alarm,Timer,
Update,Event
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