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DRV8846EVM: MSP_VINT - how to turn on in software

Pirow Engelbrecht
Intellectual 530 points
Part Number: DRV8846EVM
Other Parts Discussed in Thread: MSP430F2617, DRV8846,

Hello,

We've used the DRV8846 EVM GUI to drive our motor. Next we are using the on-board MSP430F2617 for our own software development. I can talk to the MSP430 via an MSP-FET430UIF debugger and have managed to download code and run it. 

The problem I'm having is that the VINT of the DRV8846 seems to be tied to the MSP_VINT signal on the schematic, which is tied to the VeREF+ pin on the MSP430. Can someone explain to me the thinking behind tying the VINT of the DRV8846 to this pin? Why is an IC powered from this pin? The code from TI for the DRV8846EVM MSP430  does not mention VINT by name or how the pin is activated. Can someone please help find the relevant code to turn on VeRef+ as I am unable to power the DRV8846 at the moment with custom code on the DRV8846EVM board.

Thanks  

  • 0
    TI__Guru** 114905 points
    Hi Pirow,

    VINT does not power the IC. VINT provides an external positive reference to the DAC.

    The reason the external reference was chosen was to be able to use 0 to VINT at the VREF pin of the DRV8846.

    To find the relevant code, look for "DAC" in the firmware.

    For the final application, the VREF voltage is typically created from a resistor divider from VINT to GND.