DRV8908-Q1，SDO signal is always low

Hello,

Can you please share your schematic?  Have you tested on more than one device?  It is strange that SDO is not sitting at GND.  It appears to be in some sort of HIZ state as it is floating above GND.

Regards,

Ryan

Hi Ryan，

Thanks for your reply.

This is the relevant schematic diagram，The communication pins of SPI are directly connected to the MCU terminal.

We tested two devices, and the results were the same. Do you see anything wrong with the schematic？

Hi Ryan，

Would such a signal cause a problem?

Hello,

Yes, it is possible the noise could cause data write errors.  Is that on the SCL and SCLK lines?  You can add some resistance in series to dampen that or reduce the drive strength on your MCU.  

Regards,

Ryan