TPS3851: TPS3851 / Timeout-counter is reset when SET1 pin to Low?

S.Satoshi

Part Number: TPS3851

Hi,

I understand that the watchdog timer is disabled when ISET1 pin is grounded. Then does it mean that timeout-counter is also reset?

Best Regards,

Satoshi / Japan Disty

over 7 years ago

0 Michael_DeSando over 7 years ago

TI__Genius 12630 points

Satoshi,

Please explain your question. /RESET only depends on VDD and /MR. If watchdog is disabled, this means input to WDI is ignored.

-Michael

0 S.Satoshi over 7 years ago in reply to Michael_DeSando

Guru 21675 points

Hi Michael,

I'm asking just simple question. Is the internal counter reset when SET1 is changed from High to Low as attached?

Best Regards,

Satoshi

0 Michael_DeSando over 7 years ago in reply to S.Satoshi

TI__Genius 12630 points

Satoshi,

No. SET1 has no impact on the internal counter. The SET1 connects to an internal state machine which uses logic to disable the /WDO. The internal counter doesn't depend on SET1. When SET1 goes high and enables the watchdog, a 150-us setup time reinitializes the watchdog before checking any inputs on WDI.

Does this answer your question?

-Michael

0 S.Satoshi over 7 years ago in reply to Michael_DeSando

Guru 21675 points

Hi Michael,

Thank you for your point. Let me ask one more question to clarify my understanding.

I understand that tWD is started at this point and also started to check WDI input (See attached). Is my understanding correct?

Best Regards,

Satoshi

0 Michael_DeSando over 7 years ago in reply to S.Satoshi

TI__Genius 12630 points

Satoshi,

Your text in blue is correct. Please let me know if you have any more questions. Thank you!

-Michael

Power management

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TPS3851: TPS3851 / Timeout-counter is reset when SET1 pin to Low?