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AMIC110: Pin behavier during reset

Thomas Hecht
Expert 1080 points
Part Number: AMIC110

Hello all,

I am using the AMIC110.

Currently I am wondering about the AMIC pins hehavier during reset. Pin J17 should be low during power-on reset (according to datasheet SPRS971C -AUGUST 2016-REVISED DECEMBER 2018 p.30 ), but I measure a high (3.3V) during power-on reset. What do I need to do to keep pin J17 low during active reset?

With kind regards

Thomas

  • 0
    TI__Guru 62855 points

    The datasheet indicates this pin will have a internal pull-down turned on during and after reset. It is not actively driven low. The internal pull-down only sinks about 100uA, so it would not take much to pull this pin high. What is connected to this pin? Is it possible the external components connected to this pin have internal pull-ups that are strong enough to over-drive the AMIC110 pull-down?

    You need to check your design to make sure external components are not in conflict with internal pulls of AMIC110, so they do not create a mid-supply voltage on the AMIC110 pins. The AMIC110 input buffers are turned on by default and applying a mid-supply voltage to the input buffer will create shoot-through current that could damage the input buffer if this condition is left for too long.

    Regards,
    Paul