DRV8350H-EVM: The MSP430 development board is properly debugged online, but each time the emulator is powered up, reset is required to operate, or the SBWTDIO (EZFET_SBW_RST) interface is touched by other development board interfaces, the program can run a

Scaler_cao

Part Number: DRV8350H-EVM
Other Parts Discussed in Thread: MSP430F5529, LP-MSP430FR2476, DRV8350,

I have developed a new board used to driver BLDC, It mainly used DRV 8350 and MSP430F5529, but I don't use the onboard emulator but use the EZ_FET emulator from LP-MSP430FR2476 DEVEOPMENT kit. when debugging ,I only use the SBWTDIO / SBWTCK and GND. During Online debugging it is normal ,the motor can run as I want ,everything is ok. but after disconnect EZ fet emulator, and repower the board, The board needs to RESET to run. Why?

over 2 years ago

0 Aaron Barrera over 2 years ago

TI__Mastermind 26046 points

Hi Scaler_cao,

Can you please reattach the image by using "Insert" --> "Image/Video/File"? original image did not upload.

I'm going to forward to MSP430 team to help for now since they understand SPI-by-wire interface better. The DRV8350H-EVM schematic shows EZFET_SBW_RST as a signal to the MSP430F5529, maybe it is being utilized by the DRV8350 GUI firmware. I don't see this being required anywhere else on the board, so not sure why RESET is needed. Are you talking about EZFET_SBW_RST or /RESET?

Thanks,
Aaron

0 Scaler_cao over 2 years ago in reply to Aaron Barrera

Intellectual 361 points

I developed a new development board by myself, I did not use the onboard simulator of DRV8350evm, I used another simulator to load the program, I have corrected the DRV8350evm program, under normal circumstances, as long as I power up, the motor can run. However, Now I need to reset every time I power on the board.

In addition, I tried a sensorless program and found no such problem.

0 Scaler_cao over 2 years ago in reply to Aaron Barrera

Intellectual 361 points

My expert on another thread asked the same question. But they did not solved my problem.

DRV8350H-EVM: MSP430 development board debug issues - Motor drivers forum - Motor drivers - TI E2E support forums

0 Adam Sidelsky over 2 years ago in reply to Scaler_cao

TI__Guru 61380 points

Scaler,

Aaron is out today but will be back on Monday and respond then.

Regards,

-Adam

0 Aaron Barrera over 2 years ago in reply to Adam Sidelsky

TI__Mastermind 26046 points

Hi Scaler,

I got this feedback from the MSP430 team in regards to how RST works with the Spi-by-Wire functionality:

"The RST line is needed as it is one of the two SBW pins. You also need the required pullup resistor and cap to ground to function properly. (Optional pulldown on TEST pin for noise immunity.) See Figure 2-3 in the HW Tools User Guide: www.ti.com/lit/slau278".

This is done on the eZ-FET on the EVM here:

eZ-FET of MSP-EXP430FR2476 has this too, so there should be no issue using RST on eZ-FET probe of LP-MSP430FR2476.