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TMP117: Hot Insertion startup question

Heming Liang
Prodigy 10 points
Part Number: TMP117

Our application has several TMP117 sensors connecting to a TCA9548, and while the TCA9548 does support hot insertion, we don't have any protective measures to ensure the connections connect in any controlled sequence. Are there any foreseeable potential issues with hotplugging this TMP117 sensor into a live I2C bus? The datasheet only seems to mention a 1.5ms delay between power-on and first conversion, but mentions nothing regarding startup sequences or timings. We have been lucky enough to not have any issues that we can directly link to this, but we have had some other issues with the I2C bus that have been harder to trace, and was worried that hotplugging these sensors would have anything to do with that...

  • +1
    TI__Mastermind 35835 points

    Hi Heming,

    We don't have any known issues with this; some products will glitch their I2C pins at power-on, but TMP117 should not have this problem.

    Would you like to share the I2C issues you're having? Do you have oscilloscope pictures?

    thanks,

    ren

  • 0 in reply to Ren Schackmann
    Prodigy 10 points

    Hi Ren,

    Thank you for your feedback on this. It's not a problem we've been able to reproduce with the scope attached, as it seems to only occur when the skins on our product are fully assembled. We suspect it's linked to some component overheating, but wanted to clear our uncertainty with the temperature sensors before exploring further.

    Thanks,

    Heming