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MCT8329A: How to capture the phase current on my PCB

Ron Wilton
Prodigy 80 points
Part Number: MCT8329A

I am wanting to capture the phase current from the MCT8329A on my custom PCB using an oscilloscope.

I believe that I need to:

  • Set PIN_CONFIG2.DAC_SOX_ANA_CONFIG to DACOUT
  • Set PIN_CONFIG1.DACOUT_VAR_ADDR but am not sure which 12-bit value to assign to this for the phase current
  • Connect the scope from the DACOUT pin and Ground.

Can anyone confirm this and give the register value for the phase current, please?

Thanks

  • +1
    TI__Mastermind 24810 points

    Hi Ron,

    To capture the phase current from the PCB using an oscilloscope, you can:

    • Set PIN_CONFIG2.DAC_SOX_ANA_CONFIG to CSA_OUT
    • Connect the scope between Pin 33 and Ground.

    Setting CSA_OUT will output the output of the internal Current Sense Amplifier to pin 33. Depending on if the CSA is set for bidirectional or unidirectional mode, you can use the following equations to calculate the phase current based on the shunt resistor value (Rshunt) used and CSA gain setting:

    bidirectional CSA mode: (Vso - (1.5V)) / (CSA_GAIN * Rshunt)

    unidirectional CSA mode: (Vso - (0.375V)) / (CSA_GAIN * Rshunt)

    where Vso is the voltage output by the CSA.

    Regards,

    Joshua

  • 0 in reply to Joshua Horlander Cruz
    Prodigy 80 points

    Thanks, Joshua

    Regards

    Ron