Why STEVAL-SPIN3201 not work without USB

[ARodr.12]

Hi,

I have kit STEVAL-SPIN3201 and now i have a expirience with controling my motor. But i never was able to start board without USB cable. It's seems like board need USB voltage for start microcontroller. So it can not start without USB. But if i then remove the USB, it works. But if i push the RESET button later, it does not work again until restarting kit with USB. So i need understand why it becouse in future i want to design my pcb.

[Cristiana SCARAMEL · Accepted solution]

Hello @ARodr.12​ and welcome to the ST Community.

The STSPIN32F0 RESET signal (NRST) is connected to the ST-LINK reset (T_NRST) through the jumper J8.

Try to open J8 jumper and check if STSPIN32F0 operation is independent by USB connection.

Let me know your feedback.

[ARodr.12]

Thank you! It work. Moreover, i found a bug in my program.

[Cristiana SCARAMEL]

Hi @ARodr.12​, good!

I’m glad everything is working.

Remember to "Select as Best" label in the proper reply to your original question.

So, you can help others Community member to find the answer at similar question.

[APJ]

Hello

Same problem,  STEVAL-SPIN3201 does not start without usb power.  If J8 is open, need to press reset button after connecting usb, if  J8 is short- no need to press reset, its reset automatically. After board is starting, no need usb power anymore.

Example is standart from MotorControl Workbench 6.1.2