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DRV8323R: SPI communication-related issues

huan yin
Prodigy 120 points
Part Number: DRV8323R
Other Parts Discussed in Thread: DRV8323

Tool/software:

Hi,

I'm currently learning how to use the SPI communication of the DRV8323RS, but I've encountered some problems and I don't know how to solve them.

Firstly, the 3.3V output of DRV8323 is normal. The enable pin has been pulled high, and the nFault pin is also at a high level.My SPI host is configured as follows: clock phase is 1 (the second edge is captured), clock polarity is 0, and MSB data is sent first.

For example, if I want to check the default value of the CSA Control Register (with the address of 0x06), I need to send the value 0xB000 (1011 0000 0000 0000). Then, the value I will receive will be 0x0283 (0000 0010 1000 0011).If I send the write command first, setting each bit of the CSA Control Register to 1 and then reading the register, I need to send 0x37FF (0011 0111 1111 1111) first, followed by 0xB000. The value I will obtain will be 0x07FF.But in fact, I can only receive 0x0083. This means that the instructions I sent for writing were not executed, and the data received by the read instructions was incomplete.

Before this, I had used the SPI communication of DRV8703 without any problems. However, when I switched to DRV8323, there were issues. I wonder if I missed something.It would be great if someone could offer some ideas.

Best wishes,

huan yin

  • +1
    TI__Genius 15635 points

    Hi Huan,

    DRV8703 uses a slightly different SPI frame, are you taking this into account?

    DRV8703:

    DRV8323

    Regards,

    Yara

  • 0 in reply to Yara Al Shami
    Prodigy 120 points

    Hi Yara,

    Thank you for your reply. I believe there is no problem with the SPI communication of DRV8323. Because I used a logic analyzer to capture the waveforms and found that both MOSI and MISO were correct waveforms.I can correctly send the data I have configured, and also successfully receive the updated register status sent by DRV8323.

    Thank you very much for your reply. It has been of great help to me.

    Best wishes,

    huan yin