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LMD18201 brake pin voltage problem

Ruchik Shastri1
Prodigy 10 points
Other Parts Discussed in Thread: LMD18201

I have a motor control h-bridge board with lmd18201. And lmd18201 is driven by msp430 launchpad. Even if i dont connect launchpad, if we observe brake pin voltage of lmd18201 it shows vcc. Ideally brake pin is an input pint right? How do i resolve it

  • 0
    TI__Mastermind 20985 points

    Inputs can float High if they have an internal pullup.  It's not clear to me from the datasheet if the brake pin has this.  If you try connecting a resistor from brake to ground and measure the brake voltage, you can easily determine the internal pullup resistance.  It should generally be >10kohm.

    The important thing is that the MSP430 can drive it Low.

    Best regards,
    RE