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Original question:

TMP119: TMP119 run into a wrong status

TMP119: TMP119: TMP119 run into a wrong status

menghui liu
Prodigy 10 points
Part Number: TMP119

Tool/software:

Hello ren&Meredith McKean
Regarding the latch-up phenomenon mentioned above, it can be resolved by power cycling the device.
However, if the TMP119 is power-cycled before each temperature reading, we would like to understand whether such frequent power cycling could affect its lifespan. Are there any relevant aging tests, for example, around 5,000 or 10,000 cycles, etc.? We look forward to your reply.

  • 0
    TI__Genius 9720 points

    Hello Menghui,

    We do not recommend to power cycle the device before every temperature read. Can you describe the latch up event you are experiencing? Can you provide the schematic and scope shot of the latch up condition with the VDD signal?

    Best Regards,

    Meredith McKean

  • 0 in reply to Meredith McKean
    Prodigy 10 points

    Hi ：

    The following are the application scenario descriptions and the drawings of tmp119.
    VCC line place ESD Diode（5.5V）
    SDA line place ESD Diode（3.6V）
    SCL line place ESD Diode（3.6V）
    Despite the above-mentioned protection；when the aluminium block is moving,I still capture an overshoot voltage of 200nS on the VCC. So we want to turn off the power supply of tmp119 when the aluminum block is moving and turn it on again when collecting the temperature.

  • 0 in reply to menghui liu
    TI__Genius 9720 points

    Hello Menghui,

    Thank you for the description. I do not see an issue with turning off the supply when the aluminum block is moving and turn it on again when collecting the temperature. We have power cycled the device in qual tests and seen no issues. We do not have data on aging tests for 5,000 or 10,000 cycles.

    Best Regards,

    Meredith McKean

  • 0 in reply to Meredith McKean
    Prodigy 10 points

    Hello Meredith Mckean：
    Thank you very much for your reply. Two DOES were conducted for this issue, the latch-up phenomenon has not occurred again. I would like to elaborate these two methods on this forum. Maybe they can be helpful to others.
    1. When the motor is pushing the aluminum block to move, turn off the power supply of TMP119. Then, restore the power supply when collecting the temperature.
    2.Another solution is to place a 330ohm on the power line of tmp119 to form an RC to absorb the voltage overshoot

    The above schemes are still in operation at present, but none of them have latches.

  • 0 in reply to menghui liu
    TI__Genius 9720 points

    Thank you for providing this information! I happy to hear that the latch-up issue has been resolved.

    Best Regards,

    Meredith McKean