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DRV8434S: nSCS FOR SPI COMMUNICATION

Cherry Zhou
Mastermind 22235 points
Part Number: DRV8434S
Other Parts Discussed in Thread: DRV8434, , DRV8434A

Hi team,

Here's an issue from the customer may need your help:

The customer use SPI communication between MCU and drv8434s, but the MCU do not have enough IO , so they would like to use the nscs pin to connect to ground to make the drv8434s is always selected( drv8434 is the only one device to communicate with MCU through SPI), but in drv8434s datasheet, it's found the  below description , does this means it's required to pull nscs pin high during the communication? if keep it low, the spi communication will failed?

Thanks.

Best Regards,

Cherry

  • +1
    TI__Guru 55565 points

    Cherry,

    It is not possible to simply hold nSCS low.  It functions as a "frame" select signal in addition to chip select.  

    If SPI is an issue, can they consider the DRV8434 or DRV8434A device?

    Regards,

    Ryan