DRV8353: 电机驱动器论坛

Di Tan

Part Number: DRV8353

We use drv8353 in our motor control system, vbuck is OK, output signals also OK. We use 4 GPIOs to connect to DRV8353 SPI pins, trying to control DRV8353 by SPI interface, but SDO always output 0xff, could you please help to check is there any problem in schemetic and final signal, thanks a lot in advance

For the first waveform, yellow is nSCS, blue is clock.
For the second waveform, yellow is clock and blue is MOSI
There is no need for the third waveform because MISO is always high.

Tandi

1 年多前

0 Di Tan 1 年多前

Prodigy 10 points

We are using DRV8353RS, trying to read from address 04h, but the output from MISO is always 0xffff, it is quite urgent, any suggestion is appreciated, thanks a lot

0 Cherry Zhou 1 年多前回复 Di Tan

TI__Guru* 81380 points

Hi Tandi,

We're looking into this issue and please expect the response.

Thanks

0 Cherry Zhou 1 年多前回复 Cherry Zhou

TI__Guru* 81380 points

Hi Tandi,

Is the device getting enabled well before you read the spi signals? Are you waiting for tWake before sampling?

Also I checked the register 4h

All the default values are 1 so maybe try writing a different setting with 0s in it to see if the devices is reading and writing properly.

Thanks.

0 Di Tan 1 年多前回复 Cherry Zhou

Prodigy 10 points

Hi Cherry,

Thanks for your reply.

Yes, DRV8353RS is enabled, and we waited a long time (more than 10us) after system start and then keep on reading DRV8353RS register by spi. We also tried other registers, like 01h, 05h, still got all high output, thanks

0 Cherry Zhou 1 年多前回复 Di Tan

TI__Guru* 81380 points

Hi,

The twake for this device is 1ms.

It seems like there might be some issue with the order in which the signals are being sent/read. I suggest consulting section 8.5 of the DS for SPI timings