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PTH08T210W: About auto reset time

Sam Wang1
Prodigy 140 points
Part Number: PTH08T210W

I use DAC control VoAdj and MCU control inhibit pin. When control system <DAC and MCU> shutdown and Vin keep power-up, I saw Inhibit control signal auto restet from low to high in 300ms.I'd like know if PTH08T210W auto reset in 300ms is normal reaction.

  • 0
    TI__Expert 5026 points

    Hello,

    The inhibit pin will automatically pull high whenever it is not tied to a low voltage (ground). When the MCU shuts down, is it pulling the inhibit pin directly to ground? Is there a feature of the MCU that creates an open circuit on the inhibit pin after 300ms? 

    Best regards,

    Britton

  • 0 in reply to Britton Jones
    Prodigy 140 points

    Hi Britton,

    The MCU be shutdowned due to power went off suddenly. At that time, inhibit and VoAdj become open circuit.

    I just want to know if 300ms is nominal when inhibit pull "HIGH" automatically  from reset active.

    If you still cannot get me, I can show you scope picture. Please give me email address, thx.

    BR

    Sam

  • 0 in reply to Sam Wang1
    TI__Expert 5026 points

    Sam, 

    The INH voltage is pulled high internally as soon as it becomes open-circuit, not after 300ms. Likewise, if the INH pin becomes open circuit when a sufficient VIN signal is applied to the device, then the soft-start sequence will initiate immediately. If you would like to share scope pictures, feel free to attach them in this thread or share them with me over private message. I have added you as a connection on e2e, once you accept you can share scope shots over private message.

    Best regards,

    Britton