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DRV8881: the way to handle TRQ pin

Dear all,

Please teach me the way to handle TRQ pin.

*Buck ground*

I would like to leave TRQ pin [0/0] because I want set output current for 100% fixed.

So please teach me the way to handle this pin.

Should I connect this pin to GND? or put pull down resistor?

Or, should I set this pin OPEN?

Best regards,

  • Hi Yamamoto-san,

    For 100% torque, you can use any of the following methods:

    1) Leave the pins floating (there are 100kOhm typical internal pulldowns to set the pin to a logic zero)

    2) Connect the pins to ground

    3) Use external pulldowns

    4) Drive the pins with a GPIO

    The choice is based what the system requirements are. For example in some systems, it may be desired to change the TRQ from 100% when running to 50% when holding. This could be done by connecting a GPIO on TRQ1 and leaving TRQ0 floating. When 100% is desired, set TRQ1 to a logic 0. When 50% is desired, set TRQ1 to a logic 1.