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BOOSTXL-DRV8323RH: pull-down resistance and pull-down resistance to IDRIVE and VDS

HY yang
Expert 1980 points
Part Number: BOOSTXL-DRV8323RH
Other Parts Discussed in Thread: DRV8323

Our customers are developing brushless motor drivers. DRV8323RH is used in the driver scheme. According to the data manual, the working mode and some parameters of DRV8323, such as IDRIVE and VDS, can be adjusted by hardware. When reading the schematic diagram mdbu017a (002) of the development board drv8323rh EVM, it is found that both iDrive and VDS pins have pull-up and pull-down resistances. But according to DRV8323's chip data manual, the pins only need to be pulled up or down, not both. Excuse me, for what consideration does TI add pull-down resistance and pull-down resistance to IDRIVE and VDS of DRV8323RH EVM?

  • 0
    TI__Guru 65170 points

    HY,

    Thanks for posting on the MD forum!

    Yes I had this same question when I first started working with the EVM. The reason for the default configuration having both pull up and pull down is because the device will see this as HI-Z and the user has the option to remove either the pull up or pull down easily which gives them access to three different settings with minimal component changes.

    Regards,

    -Adam