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Original question:

DRV8343-Q1: DRV8343-Q1 minimum hardware configuration

DRV8343-Q1: Phase current and BEMF

John Pan
Intellectual 990 points
Part Number: DRV8343-Q1

Hi, I am working on a BLDC motor control project and interested in using DRV8343 gate driver. I have two questions:

1. Will DRV8343 sense BEMF signal from the motor? If yes, could the BEMF signal be sent to a MCU through SPI communication?

2. Could phase-current signals be sent to a MCU through SPI communication?

Thanks,

John

  • 0
    TI__Guru 65250 points

    John,

    Thanks for posting on the MD forum!

    The DRV8343-Q1 does not sense BEMF but it does sense phase current which can be used to infer what the phase output is doing and therefore used for some of the same purposes.

    On our EVMs we usually use a simple resistor divider to allow the MCU to sense the phase voltage and bus voltage which together with the phase currents allow the MCU to do advanced algorithms like sensorless FOC.

    The SPI does not have the ability to communicate phase current, it needs to be sensed by an ADC on the CSA output pins (SOA/SOB/SOC). Maybe an external device can connect to SOA/SOB/SOC and communicate with your MCU over SPI.

    Regards,

    -Adam

  • 0 in reply to Adam Sidelsky
    Intellectual 990 points

    Hi Adam,

    Thank you very much. That is very helpful.

    Best regards,

    John