STLED325 datasheet(18/62 Pages) STMICROELECTRONICS

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Functional description

STLED325

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Doc ID 17576 Rev 1

3.10.3

Wake-up

The STLED325 can wake-up from any one of the following sources:

– Front-panel keys

– Remote-control keys

– Real time clock (RTC) in 3 conditions (alarm, watchdog timer, oscillator fail)

– External wake-up pin (by a low to high transition on this pin)

– GPIO status changes

– READY pin goes from low to high

Figure 7.

Standby condition (normal behavior)

– When the hot-key is detected either from front-panel or remote control or RTC or from

a transition (low to high transition) on WAKE_UP pin during stand-by, the STBY pin

de-asserts.

– The de-assertion of the STBY triggers the guard timer.

– The timer value is the programmed value by the user (1-15s). If the user did not

change the value before entering standby, then it remains 10s.

– Also note that the guard timer is off when the STLED325 is in the standby mode.

The guard timer is thus triggered by a de-assertion of the STBY signal or by internal power

on reset signal.

STBY

3a) Standby condition (normal behavior )

Hot key command from IR

or Key pad or RTC or WAKE_UP for wake up

READY

MUTE

STBY

3b) Standby condition (abnormal behavior , processor is not responding)

Hot key command from IR

or Key pad or RTC or WAKE_UP for wake up

READY

MUTE

READY continues to remain low

Signals STBY after

guard timer count is over

Guard timer triggers

READY asserts within programmed timer value (1s-15s)

Guard timer

triggers

STLED325 Datasheet(PDF) 18 Page - STMicroelectronics

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