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TPS1HA08-Q1: How to disable or not enable watchdog feature

Jules Lauve
Prodigy 10 points
Part Number: TPS1HA08-Q1
Other Parts Discussed in Thread: TPS3305

My two questions are about the differences between version A and version E of the device

We have an existing circuit whose design includes version A — so, the full device number is TPS1HA08A-Q1.

We wish to purchase 105 pieces of version A, however, it is on long-lead-time back-order at both Mouser and Digi-Key, 26 weeks and 119 weeks, respectively.

Digi-Key’s website offers that version E is a suitable substitute for version A.

In the T.I. product literature (tps1ha08-q1.pdf), the only difference between A and E that we can find is that E incorporates an optional watchdog feature.

Our two questions then are:

1. Is the watchdog feature the only difference between version A and version E?

2. If yes, can the watchdog feature on version E be disabled (or not enabled) such that version E can be a suitable drop-in replacement for version A? -- and what steps should be taken to accomplish that?

Thank you.

DATA SHEET:

https://www.ti.com/lit/ds/symlink/tps1ha08-q1.pdf#page=3

  • 0
    TI__Mastermind 35605 points

    Jules,

    Functionally as far as spec/ratings the devices are the same, however there is no way to disable the watchdog feature on the E version. You would have to modify your software on your microcontroller or on your system to PWM the enable pin to allow for the watchdog not to expire.

    Best Regards,

    Timothy Logan
    Applications Manager - Power Switches

  • 0 in reply to Timothy Logan
    Prodigy 10 points

    Thank you Timothy. However, in the navigation pane on the right I found a similar topic, “TPS3305. how to disable Watchdog feature” which references the T.I. document “slva145: Disabling the Watchdog Timer for TI’s Family of Supervisors.” My question then is, does that document apply to this particular high-side switch?

  • 0 in reply to Jules Lauve
    TI__Mastermind 35605 points

    It does not apply to the TPS1H1A08-Q1. They are completely separate devices/architectures. Glancing at it, it looks like TPS3305 has a dedicated watchdog pin that allows this to be possible, however our high-side switches are different architectures so it is not comparable to supervisors.