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DRV8320: PWM Mode Issues

Laura Shuey
Intellectual 810 points
Part Number: DRV8320

We use the DRV8320 in 1 PWM-mode (Hall sensors connected to the DRV). It now seems that it behaves not as expected when we connect the driver to the motor supply voltage ‎(it seems to default to 6 PWM). Can we somehow reconfigure to 1 PWM before switching on the motor supply ? 

  • 0
    TI__Expert 4650 points
    Hi Laura,

    Are you using the DRV8320S or DRV8320H? On the DRV8320S, you'll need to make a SPI write to configure the device for 1x PWM Mode after power up and the device is enabled. For the DRV8320H, you'll need to configure the MODE pin as Hi-Z.
  • 0 in reply to Phil Beard
    TI__Intellectual 810 points
    I use the DRV8320S. My problem is not that I do not know how to enter the 1-PWM mode. The problem is that the DRV, when connected to support 1-PWM mode (Hall sensors connected to INLA, INHB, INLB), seems to start in a not defined state and, depending on the status of the Hall sensor signals, enters an error mode (shoot through). This is because I cannot configure for 1-PWM before actually switching on the Vm. But as soon as I switch on Vm the DRV starts to operate according to a default mode (which does not seem to be 1-PWM) and interprets the Hall sensor signals as bridge control signals.
    I would need to have a means to start the DRV in a state where the bridge is off (no matter what the bridge control inputs state is), configure for 1-PWM via SPI and only then enable the bridge control inputs.