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Original question:

DRV8846EVM: DRV8846EVM

DRV8846EVM: using DRV8434SEVM with own microcontroller

sudhanshu mehta
Prodigy 30 points
Part Number: DRV8846EVM
Other Parts Discussed in Thread: DRV8434SEVM

Hello All,

I have DRV8434SEVM and I want to test this with my microcontroller. 

1) I have removed resistors around j3 jumper and connected 

2) GND and VCC (3.3) from my microcontroller Board.

3) SDI, SDO, nSCS and SCLK with SPI of my board.

4) I have shorted nSleep, Enable, vsdo, vref with 3.3 volt.

5) nFault i have pulled up via 10kohm.

6) vbat i have connected to 24 volt.

I am missing anything?

Question: If i do not connect USB to this eval board and then if i do not connect 3.3 volt  from microcontroller, then also at J3 connector, on 3.3 v pin, I am getting voltage. 

if you have some other source code and setup example, kindly share

 

Thanks

Sudhanshu

  • 0
    TI__Mastermind 37683 points

    Hi Sudhanshu,

    This looks good to me. my one concern is that the 3.3V is coming from your MCU. If you tie nSLEEP, ENABLE, VSDO, and VREF to one single GPIO pin of the micro, the micro may not be able to source enough current. I recomment tying them to seperate GPIOs or if you do not play on controlling these pins with the micro, just tied them to an external 3.3V supply that can provide enough current. 

    Regarding your question about the USB, since you will not be using the GUI or the onboard MCU to control the driver, you do not need to connect a 3.3V to the 3.3V_MCU pin of the J3 header. However, you do need to connect 3.3V to the VSDO pin. Also, you need to make sure the SPI signals are running on 3.3V logic as well.