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ADVANCED COMMUNICATIONS & SENSING

DATASHEET

SX8124

24 hours timer synchronized on 50/60Hz mains

ACS - Revision 2.4

October 2010

© Semtech Corp.

9.2

Reset with the DURATION pin

Moving the DURATION voltage to 0V and then moving it back to the desired duration will reset the 24 hours

timer. This can be done either with a switch in parallel with the DURATION resistive divider or if this divider is

made with a potentiometer by turning this potentiometer to 0 leaving it there for a few seconds and then

bring it back to the desired position.

The voltage on DURATION pin remains ratiometric to VDD while VDD is below 1.8V.

Additionally, if the voltage on DURATION pin exceeds |1.8V| the timer is reinitialized.

Figure 13. Timer reset by pushing DURATION pin to ground

Figure 14. Manual reset moving DURATION pin voltage down to 0V

0h 24h

12h

18h

6h

DURATION

SX8124

VSS

VDD

start

reset

DURATION

OUT

NOUT

toggle at set duration

24h cycle

(re)start