bq24161B / Watchdog timer expired afte charge done

S.Satoshi

Other Parts Discussed in Thread: BQ24161B, BQ24160A

Hi All,

Please let me ask about watchdog timer.

Our customer has evaluated bq24161B and then they confirmed that bq24161B was in default mode after charge done. In their system, the host controller monitor STAT pin output and the host will be suspended after it detect charge done by STAT pin output. We understand that the watchdog timer flow (Fig.24 in Pg.20 of DS) will be finished after the battery is fully charged, but it seems the flow was not finished and so bq24161B was entered default mode.

Best Regards,

Sonoki / Japan Disty

over 9 years ago

0 Jeff F over 9 years ago

TI__Guru*** 143850 points

If the watchdog signal is still being sent by the host, then the IC will remain in host mode (and therefore NOT reset any registers to default values) regardless of charging or charge done.

0 S.Satoshi over 9 years ago in reply to Jeff F

Guru 21675 points

Hi Jeff,

Do you mean that the IC enter default mode if the watchdog signal is not set by host after charge done? Is it the correct operation of bq24161B?

Best Regards,

Sonoki

0 Jeff F over 9 years ago in reply to S.Satoshi

TI__Guru*** 143850 points

Yes and yes.

0 S.Satoshi over 9 years ago in reply to Jeff F

Guru 21675 points

Hi Jeff,

Let me double-check to let me understand correctly.

I understood that the watchdog timer should be stop when ITERM is detected as shown in Fig.24. But the correct understanding is the watchdog timer continue to operate after detecting ITERM, right? So the customer need to use bq24160A which is disabled watchdog timer if they want to halt communication between host and charger after charge done.

Best Regards,

Sonoki

0 Jeff F over 9 years ago in reply to S.Satoshi

TI__Guru*** 143850 points

The watchdog timer is independent of charge done.

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bq24161B / Watchdog timer expired afte charge done