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LM34904: The /Pok pin, doesn't get high with expected volatges on overcurrent or when Enable signal is low.

Puneet Chandhok
Prodigy 130 points
Part Number: LM34904

Need to know proper value of pull up resistor that needs to be connected with Pok, to get its level at least 3.3V.

Presently with a pull up resistor of 10 k and VCC 5V, signal goes as high as 1.88V, with 5k, goes upto 2.5V on reducing the pull up resistor to 5k, and 2.6V on reducing value of pull up to 1k.

Is this behaviour of IC acceptable?

As /Pok is an Open drain pin, so what voltage levels can be connected, to pull-up.

Regards,

Puneet

  • 0
    TI__Genius 10855 points

    Hi Puneet, 

    Thanks for reaching out on E2E!

    The POK pin can be pulled up to 6V as the absolute max, therefore you can pull it up to your 5V VCC. This behavior of the IC is acceptable, as long as the POK outputs during the correct conditions in the truth table, it is functioning as expected. 

    Thanks,

    Arthur Huang