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Original question:

[FAQ] PCM1860: What should I do with unused inputs on the PCM1860 and other devices in the PCM186x family?

PCM1860: State of INT w/o sys. controller

Steven Drennan
Prodigy 210 points
Part Number: PCM1860

I have a new design that does not have a microcontroller connected to INT (PIN 19), like example shown in section 10.2 of the datasheet. Can TI confirm that this pin can be left floating?

  • 0
    TI__Guru 62915 points

    Hello,

    It is recommended to place a 10k pull-down to GND on this pin instead of leaving it floating.  If it's driven high due to an external ESD or transient event while left floating then the PCM1860 would be placed in a powered-down (idle) state.

  • 0 in reply to Collin Wells
    Prodigy 210 points

    Per datasheet page 9, pin functions table, Pin 19 states "Pull high for active mode, pull low for idle.". Doesn't this contradict what you are saying here? Which statement is correct?

  • 0 in reply to Steven Drennan
    TI__Guru 62915 points

    Hi Steven,

    The discrepancy in the page 9 pin function table is a known error in the PCM1860 datasheet and will get updated during the next revision.  The applications sections and PCM1860 power-down  information (pages 60 and 76) describes the correct operation which is driven high for idle (mute) mode and driven low for active mode.  We have tested this behavior on an EVM and have confirmed it in the past.