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TMP61: Built-in fail-safe

Motoyasu Hattori
Genius 11135 points
Part Number: TMP61

Hi,

I can find the following sentence on the datasheet. Could you please explain the following in details?

– Built-in fail-safe in case of short-circuit failures

I want to know this feature, "Built-in fail-safe", in details.

Thanks and best regards,
M.HATTORI

  • 0
    TI__Genius 9380 points

    M.HATTORI,

      The built in fail safe is how the part acts when under this condition.

    The assumption can be made that if a short is applied to a power circuit that circuit becomes extremely hot very fast. Because the TMP6131DEC (or other version of this part) has a positive temperature coefficient, the resistance will increase. However the Vsense to the ADC will never get close to the rails under this condition so valid measurements up to max limit of the part can be made.

    An NTC typically will go low resistance and at high temperatures will get very close to the lower rail (in the 100 Ohm range). The question is is it hot or does the NTC have a problem. Our TMP6131DEC was designed to never operate so close to the rails that a temperature measurement could be mistaken for a problem.

    The TMP6131DEC only has one failure mode, that is an open. If the part fails and opens, it is an easy detection that there is a problem. This is one reason the TMP6131DEC has a FIT rate of 3.

  • 0 in reply to Gordon Varney
    TI__Genius 11135 points

    Thanks.  I understood.

    Best regards,
    M.HATTORI.