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DRV8711: SDATO Connection with 4x DRV8711

ka88
Intellectual 275 points
Part Number: DRV8711

Hello,


I am using 4x DRV8711 connected to a single SPI bus to an MCU.  Per typical fashion, the SCS/SDATI/SCLK are operated as push-pull IO's but the SDATO is open-drain which is a bit puzzling to me.

My assumption is that I can connect all four SDATO lines together, and use a single pull-up resistor.  Will this cause any issue?

What is the specific rise/fall times that should be met in order to size this resistor (could be quite a bit of parasitic cap on SDATO)?  How much current can the SDATO pins sink while driving the bus?

Thanks.

  • 0
    TI__Guru** 114905 points
    Hi Kevin,

    Yes, you can connect all four SDATO lines together. The current the outputs can sink is 5mA , which is listed in the datasheet.

    There is no specific rise fall time. The speed of the SPI may need to be reduced if the SDATO line is too slow.