AB08XX Series
Real Time Clock Module
Date of Issue: Sept. 10
th
, 2012
Page (3) of (12)
3.0 x 3.0 mm
Abracon Drawing #
ESD Sensitive
Revision #: Initial Release
3. AB08XX Example Applications
3.1
Battery Backed Up RTC
The most common AB08XX application is a battery backed up RTC, which maintains time and may hold data in RAM. The
AB08XX is normally powered from a system power supply, which may be a larger battery. The AB08XX is continuously
charging a supercapacitor or rechargeable battery via the internal trickle charger. When the main power supply goes away,
the AB08XX automatically switches to the VBAT supply and maintains time and RAM data at very low battery supply
currents.
System Power
VBAT
Battery/
Supercap
XO
VCC
I2C/SPI
VCC
AM08XX
AB08XX
FOUT/nIRQ
IRQ
VSS
MCU
XI
VSS
3.2
RTC with Interrupt Aggregation
The flexible inputs of the AB08XX can be used to aggregate a variety of interrupt sources, including external digital inputs,
analog levels, timers and alarms into a single interrupt source to an MCU.
System Power
XO
VCC
I2C/SPI
VCC
XI
Digital Inputs
Analog Level
WDI
AB08XX
AM08XX
FOUT/nIRQ
IRQ
MCU
EXTI
VBAT
VSS
VSS
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