DRV8301: SPI configuration problem with DRV8301

Annie Liu

Part Number: DRV8301
Other Parts Discussed in Thread: DRV8323

Hi Team,

Customer used DRV8301 and he needed to modify OC_ADJ_SET via SPI. But SPI is always unable to communicate properly. It is normal to measure the SCK SDI data by the oscilloscope, but the SDO data is not normal. Regardless of which register of the DRV8301 is read, SDO only MSB is high. The yellow line is SCK as shown. Blue line is SDO. This is the waveform when register 2 is read. The register 2 value has been set to 0x0100 before reading.

Thanks.

over 5 years ago

0 MIrtcho Maglijanov over 5 years ago

Prodigy 120 points

Please check SPI CS pin too.

What is the state of other pins like DC_CAL EN_GATE as wel as VDD_SPI. Keep in mind that DRV8323 SDO is open drain and weakly pulled up

0 Adam Sidelsky over 5 years ago in reply to MIrtcho Maglijanov

TI__Guru 63060 points

All,

Thanks for posting on the MD forum!

Mirtcho had good suggestions, please check that. Also please share the schematic.

Regards,

-Adam

0 Annie Liu over 5 years ago in reply to MIrtcho Maglijanov

TI__Genius 10295 points

Hi Mlrtcho,

Test the CS foot with an oscilloscope. It is normal. DC_CAL is connected to the microcontroller, and the IO is configured as an input mode, which is equivalent to floating. 3.3v connected to VDD_SPI. No matter EN_GATE is configured to be high or low, it is not acceptable.

Thanks.