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DRV8302: Simple Driver Using Hall Sensors

Oliver Rokison
Prodigy 70 points
Part Number: DRV8302

I am trying to make a very simple circuit for getting a motor to turn, but I like the current and voltage protection of the DRV8302

Two quick questions about this chip:

1. If I already have a stable power supply for my microcontroller, can I leave all the buck related pins disconnected?

2. If I am using hall effect sensors to determine motor position, can I eliminate the shunt resistors, and leave SP1, SN1, SP2, SN2, SO1, and SO2 disconnected, and DC_CAL permanently LOW (or disconnected), or are the shunt resistors needed for some of the internal operation of the chip? This way I would just drive the 6 input pins in a sequence as determined by my microcontroller and it's readings from the hall sensors.

Many thanks for your help

  • 0
    TI__Guru** 114905 points
    Hi Oliver,

    1. If I already have a stable power supply for my microcontroller, can I leave all the buck related pins disconnected?

    Yes, you can leave the buck disconnected. Set the EN_BUCK signal to 0V. The buck is available if needed. It does not have to be used.

    2. If I am using hall effect sensors to determine motor position, can I eliminate the shunt resistors, and leave SP1, SN1, SP2, SN2, SO1, and SO2 disconnected, and DC_CAL permanently LOW (or disconnected), or are the shunt resistors needed for some of the internal operation of the chip? This way I would just drive the 6 input pins in a sequence as determined by my microcontroller and it's readings from the hall sensors.

    Removing the shunt resistors is okay. Be sure to set the OC_ADJ voltage to protect the FETs in the case of large currents during startup or motor stalls.