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DRV8343-Q1: Current Limiting Resistor for INHx/INLx Pins

Jacob Wyrick
Expert 8665 points
Part Number: DRV8343-Q1


Hi team,

Quick question. If we're controlling the INxx pins via off-board sensors or other digital controller, do we have any guidance for current limiting resistors? Is there guidance for a limit on the current during an overvoltage condition?

We're planning to use TVS diodes to clamp at 13.5V if that helps.

Thanks,

Jacob

  • 0
    TI__Mastermind 18981 points

    Hi Jacob, 

    For INHx/INLx input pins specifically, I don't really think there's a need for current limiting resistors, assuming you're not dumping excessive voltage or current onto those pins.a

    • how much current are you expecting the INHx/INLx pins to endure due to external I/O driver? 

    INHx/INLx voltage requirements, abs max: 

    • the -0.3V is from ESD diode, which you don't want to excessively forward-bias with negative voltages as it'll damage the device over time by dissipating power 
    • the 5.75V upper limit is due to INHx/INLx operating on digital level voltages, so it's best to stay under that 

    INHx/INLx info, electrical char table: 

    • may want to consider passive pulldown resistance of 50-200kOhm, if power dissipation on input pins is a concern? 

    Best Regards, 
    Andrew