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DRV8305: DRV8305 SPI and SDO

Part Number: DRV8305

Hi,

I have been trying to get SPI communications with a DRV8305. I have been receiving inconsistent reads from the DRV8305 SPI registers. Debugging the issue, saw the problem was that the SDO line was not rising fast and upto logic HIGH (attached SPI waveforms). While trying to figure out the issue, google pointed me to an issue:

Looked at the datasheet and the EVM schematic for that mentioned SDO pullup resistor, but I am unable to find any resistor in there. Can someone point me as to what value resistor is required for the pullup ?

Thanks,

Manu

 

DRV8305_SPI_Debugging_SCLK-SDO.pdf

DRV8305_SPI_Debugging_SCLK-SDI.pdf