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TMP431: Negate method at 85 ℃ at startup in TMP431A

Shuji Ishiwata
Mastermind 7855 points
Part Number: TMP431

Hi All,

I have a question about TMP431A.

The default for the TMP431A is 85℃
It is asserted at boot time if it is already 85℃ when the device is booted.
Is there a way around this?

Or is it possible to negate THERM and ALERT / THERM2 when the (SD) bit is set to [1]?


Best Regards,
Ishiwata

  • 0
    TI__Mastermind 28075 points

    Hi Ishiwata-San,

    Thank you for your question.

    Per section 8.3.7 of the datasheet, the THERM function cannot be software disabled, the same would be true of the ALERT/THERM2_n pin when it is configured for THERM mode. 

    However, the ALERT/THERM2_n pin can be disabled when configured for ALERT mode, using bit 7 of configuration register 1 (MASK bit).

    If you immediately configured the TMP431 for shutdown mode at startup (SD = 1), you would prevent an ALERT or THERM limit from firing, because no conversions would be taking place. You could then adjust the limits to your preferred values, and disable shutdown mode if desired. 

    Best Regards,
    Brandon Fisher

  • 0 in reply to Brandon Fisher94
    Mastermind 7855 points

    Hi Brandon-san,

    Sorry for the late contact.
    Thank you for your reply. I understand.

    I have additional questions.

    Is there a waiting time (waiting for register access start) after reset for such as Software Reset, power-on reset, general call reset?

    Best Regards,
    Ishiwata

  • +1 in reply to Shuji Ishiwata
    TI__Mastermind 28075 points

    Hi Ishiwata-San,

    We do not have a startup time specification for the TMP431, so they should be okay to communicate with the TMP431 immediately after startup, although I would recommend waiting at least as long as it takes for their supply to stabilize at its operating voltage. 

    If they would like to be safe, they could wait 1-2ms after POR, which will still provide them with plenty of time before the first conversion occurs (12ms min for the local channel). 

    Best Regards,
    Brandon Fisher