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DRV3201 AGND

Henrik Danielsson
Expert 1405 points

Hello

There are serveral analog ground pins to the DRV3201 (pin 11, 20, 27, 57, 51, and 39). What are they internally connected to, the current sense opamps maybe? 

Are they ment to be connected to an analog ground plane or can they be connected to the digital ground?

The reason I ask is because I have an anlog ground plane for some other ADC stuff on my board. I want to keep this analog ground plane as quitet as possible and don't want any high currents from the DRV3201.

Best regards 

Henrik

  • 0
    TI__Guru** 114905 points

    Hi Henrik,

    We are contacting our expert on this device. He should reply soon.

  • 0 in reply to Rick Duncan
    Expert 1405 points

    good, I have a few other questions regarding the layout.

    Would it be ok to ground the shunt resistor (at pin 31) to PGND? If it is possible, I also need to connect the reference pin for the internal current sense logic to PGND? The datasheet doesn't say which GND pin.

    Would it be ok to connect VSH directly to the starpoint without 5ohm resistor and without a capacitor to gnd in case I have reverse battery protection. I know there is a R C for reverse battery protection, but is it also a filter go get more reliable readings from the comparator?

    Would it be ok to ground the VS capacitor to PGND ( I guess the voltage at VS doesn't have to be that smooth)?

    /Henrik

  • 0 in reply to Henrik Danielsson
    TI__Expert 3555 points

    My answers are in bold

    Are they ment to be connected to an analog ground plane or can they be connected to the digital ground?

    The AGND pins should all be grounded on the analog ground plane, these are all low current paths.

    Would it be ok to ground the shunt resistor (at pin 31) to PGND?

    For clarification do you mean GNDLS_B through the 330mOhm shunt to PGND? If so, yes that is ok.

     If it is possible, I also need to connect the reference pin for the internal current sense logic to PGND?

    Could you clarify which pin you are referring to?

    Would it be ok to connect VSH directly to the starpoint without 5ohm resistor and without a capacitor to gnd in case I have reverse battery protection.

    Yes

    Would it be ok to ground the VS capacitor to PGND ( I guess the voltage at VS doesn't have to be that smooth)?

    Yes that is fine