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DRV8320: GND and External Supply Voltage

Laura Shuey
Intellectual 810 points
Part Number: DRV8320

1. Is the AGnd pin connected to PGnd in the chip or do we explicitly need to connect it to system GND (we have connected PGnd to system GND in any case)?

 

2.      Is it possible to apply an external supply voltage to DVDD (slightly higher than 3.3, lets say 3.4V) or not (I know it is intended to actually supply low power controls but as it seems we have an issue in the schematic and connected DVDD to our 3.3V supply rail)?

  • 0
    TI__Mastermind 21805 points

    Hello Laura,

    1. AGND and PGND are internally connected, but we do recommend that you short both nets to the thermal pad below the IC (and your GND net). We specify them separately because some customers want to get fancy with their grounding and they want to have separate AGND and PGND NETs with a connecting shunt between them. But this isn't necessary to operate the IC.

    2. You can supply a voltage higher than DVDD to the DVDD pin, and the device will turn off the internal LDO and be supplied by the external source. To operate over all possible conditions, you will need to supply >3.6V (as per the VDVDD specification in the datasheet). If the external supply is lower than the DVDD regulated output, then our LDO will fight your external supply, and something will probably get damaged.

    Thanks,

    Matt