AB08XX Series

Real Time Clock Module

Date of Issue: Sept. 10

3.0 x 3.0 mm

ESD Sensitive

Page (3) of (12)

Abracon Drawing #

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.

VCC

VSS

FOUT/nIRQ

IRQ

VCC

VSS

AM08XX

MCU

I2C/SPI

VBAT

System Power

Battery/

Supercap

XO

XI

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.

VCC

VSS

FOUT/nIRQ

IRQ

VCC

VSS

AM08XX

MCU

I2C/SPI

System Power

XO

XI

WDI

EXTI

VBAT

Analog Level

Digital Inputs

AB08XX

AB08XX