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AB18X5-RTC Folha de dados(PDF) 5 Page - Abracon Corporation

Nome de Peças AB18X5-RTC
Descrição Electrónicos  Baseline timekeeping features
PDF  37 Pages
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Fabricante Electrônico  ABRACON [Abracon Corporation]
Página de início  https://abracon.com
Logo ABRACON - Abracon Corporation

AB18X5-RTC Folha de dados(HTML) 5 Page - Abracon Corporation

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AB18X5 Real-Time Clock with Power
Management Family
Date of Issue: October 16, 2014
3.0 x 3.0 mm
Page 5 of 37
Abracon Drawing #453568
Revision: C
3. AB18X5 Application Examples
The AB18X5 enables a variety of system implementations in which the AB18X5 can control power usage
by other elements in the system. This is typically used when the entire system is powered from a battery
and minimizing total power usage is critical. The backup RAM in the AB18X5 can be used to hold key
MCU parameters when it is powered down.
3.1 VSS Power Switched
In the recommended implementation, the internal power switch of the AB18X5 is used to completely turn
off the MCU and/or other system elements. In this case the PSW/nIRQ2 output is configured to generate
the Sleep function. Under normal circumstances, the PSW/nIRQ2pin is pulled to VSS with less than 1 ohm
of resistance, so that the MCU receives full power. The MCU initiates a SLP operation, and when the
AB18X5 enters Sleep Mode the PSW/nIRQ2 pin is opened and power is completely removed from the
MCU. This results in significant additional power savings relative to the other alternatives. A variety of
interrupts, including alarms, timers and external interrupts created by a pushbutton as shown, may be used
to exit Sleep Mode and restore MCU power. The RAM of the AB18X5 may be used to retain critical MCU
parameters.
3.2 VCC Power Switched
An external transistor switch T may also be used to turn off power to the MCU. This implementation allows
switching higher current and maintains a common ground. R can be on the order of megohms, so that
negligible current is drawn when the circuit is active and PSW/nIRQ2 is low.
VCC
VSS
IRQ
VCC
AB18X5
MCU
I2C/SPI
VSS
XO
XI
EXTI
FOUT/nIRQ
R
PSW/nIRQ2
VCC
VSS
IRQ
VCC
AB18X5
MCU
I2C/SPI
VSS
R
T
PSW/nIRQ2
FOUT/nIRQ



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