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DRV8705H-Q1EVM: No reply from SPI

Erdao wu
Prodigy 10 points
Part Number: DRV8705H-Q1EVM

Tool/software:

1.

I use the development board of 8705Q,  i test PVVD =13.5v ,  DVVD= 5V ,  sleep = 5V，
2.spi sen read   : IC_STAT_1 ,  VGS_VSD_STAT , IC_STAT_2 ,but no  respond.
3.miso is alway 0.
  • 0
    TI__Expert 6095 points

    Hi Team，

    Hope all is well.

    we just want to know why miso is always 0.  Is there any configuration fault?

    Best Regards,

    Link

  • 0 in reply to Link Huang
    TI__Mastermind 44515 points

    Hi Erdao,

    Thank you for posting in this forum.

    Erdao wu said:

    1.

    I use the development board of 8705Q,  i test PVVD =13.5v ,  DVVD= 5V ,  sleep = 5V，

    Are you using an external MCU to control the DRV8705S-Q1 in the EVM? The title reads DRV8705H-Q1EVM which is for the GPIO hardware controlled device DRV8705H-Q1.

    Erdao wu said:
    2.spi sen read   : IC_STAT_1 ,  VGS_VSD_STAT , IC_STAT_2 ,but no  respond.
    3.miso is alway 0.

    Based on the transaction the MOSI was 0x1000 for IC_STAT_1, 0x1100 for VGS_VSD_STAT, 0x1200 for IC_STAT_2.  See datasheet page-37, snippet as below. 

    Following this format, MOSI must be 0x4000 for reading the IC_STAT_1, 0x4100 for reading the VGS_VDS_STAT and 0x4200 for reading the IC_STAT_2 registers. Please try these MOSI values.

    Also be sure to remove the 0 Ω jumpers close to the header to ensure the on-board MCU does not load these pins. 

    Regards, Murugavel