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TPS3890: Vdd vs Threshold voltage

Jared Becker
Genius 11495 points
Part Number: TPS3890

Hi Team,

I would like to clarify Vdd vs the threshold voltage for the TPS3890..

Below in the chart, there is a nominal Vdd column..

However, if I am using the TPS389025 device, am I ok to use a 3V3 Vdd? Are the threshold voltages affected by the Vdd applied?

Thanks,

Jared

  • 0
    TI__Genius 12630 points
    Jared,

    The nominal Vdd column is referring to the supply voltage that specific version is aiming to monitor. For any of these devices, a supply voltage between 1.5V and 5.5V will power the device but the SENSE voltage is what the device actually monitors. You are OK to use 3.3V Vdd for TPS3890-25 but the threshold on SENSE for negative-going will still be 2.4V and the positive-going threshold at 2.414V. This means you have to be sure 2.4V is what you are wanting to monitor even if powering the device with 3.3V.

    Let me know if this answers your question or if you need anything else. Thanks!

    -Michael
  • 0 in reply to Michael_DeSando
    TI__Genius 11495 points
    Hi Michael,

    Thank you for the answer! What happens if I do not want to monitor a voltage with the sense pin, but only want to use the MR pin to create a delay.. what should i do with the sense pin?

    Best,
    Jared
  • 0 in reply to Jared Becker
    TI__Genius 12630 points

    Jared,

    In that case, you want to keep SENSE above the threshold for the device (so no reset condition occurs) which allows you to force the reset with MR. In your case, keep SENSE above 2.4V.

    -Michael