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RM44L920: GIO open drain output characterisic

Charles Cammarata45
Intellectual 270 points
Part Number: RM44L920
Other Parts Discussed in Thread: DRV8880

Greetings.

I would like to use a GIO pin on the RM44 to drive a tri-level pin on the DRV8880,

GIO pins can be configured as open drain outputs. What is:

  • The off state leakage current of the open drain output
  • Assuming the state of the output can be read via register, is the state of the open drain output directly read from the open drain pin?

  • 0
    TI__Mastermind 49120 points

    Hello,

    An open-drain output is effectively "high-impedance" that requires to be pulled-up using an internal / external pull-up. The leakage current is the same as that for the input pin leakage specified in the datasheet. For RM44x this value is +/- 1uA (plus any current for the pull-up).

    The pin state can always be read using the *DIN registers. An open-drain output needs a pull-up, so it will still read '1' when the part is not driving a low-level, and will read '0' when the part is driving a low-level.