STLED325 datasheet(16/62 Pages) STMICROELECTRONICS

Il numero della parte	STLED325

Spiegazioni elettronici	Standby power management to host

PDF	62 Pages

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Produttore elettronici	STMICROELECTRONICS [STMicroelectronics]

Homepage	http://www.st.com

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16 / 62 page

Functional description

STLED325

16/62

Doc ID 17576 Rev 1

Figure 5.

Power-up condition

Note:

Guard timer is turned off by default upon READY assertion.

If Guard timer is to be kept on during READY high condition, the guard timer registers must

be set accordingly by proper commands through I2C bus.

In this power-up condition, Guard timer is triggered by internal POR pulse.

During power-up, the Guard timer value is 10s.

VCC to STLED325I

Internal POR

STBY

READY

MUTE

Guard timer counts up to 10s

1a) Power-up condition (normal behavior )

VCC to STLED325I

Internal POR

STBY

READY

MUTE

Guard timer counts up to 10s

1b) Power-up condition (processor not responding )

Count over

Due to abnormality in the processor, READY did not

change state from low to high, leading to STBY

assertion

READY asserts within 10s which is the desired

behavior, processor is active and not hung

READY continues to remain low/high

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