Other Parts Discussed in Thread: DRV8353
We are using a DRV8353Rx-EVM board in our PMSM motor controller bring up project. We wish to actuate the DRV chip from our STM32F405 microcontroller hence we have removed the TI board that was supplied with the eval board and are instead connecting our mcu to the headers.
- We are supplying the DRV board with 48V from a power supply. The 3v3 LED lights up when we turn on the power supply.
- We have made all the connections between our mcu and the DRV board as per the user guide (enable, 2 gnd, 3x PWM signals, all current sense and voltage sense pins).
- We have verified that the mcu is sending the correct enable and PWM signals to the DRV8353.
- We haven't changed any of the default resistors or made any configurations over SPI since the default settings will work for our application.
- We have probed the following pins w.r.t gnd c26 = 3.3v, c24 = 12v, c33 = 48v so it looks like the board does have power.
- The nfault led does not light up so we assume the board is not in a fault condition and is not broken.
At this point, the FET driver chip does not seem to be enabling the FETs. We need help to get the FET driver to listen to the PWM and drive the FETs.
- Since we are not using (and have removed) the TI supplied mcu board, is this preventing the DRV chip from operating?
- If so, what do we need to do (SPI or hardware resistor) to make the DRV chip work with our mcu?
Help is greatly appreciated!
Thank you!
