STSPIN32F0251 Protection trigger with built-in gate drive

[ZHuan.4]

I am currently working on a motor control project development using STSPIN32F0251.

Six-step control using HALL sensor, 48V power supply, working phase current is 11A. Then now running at 10A, the smartSD protection with the built-in gate drive is triggered, and the built-in FAULT pin outputs a low level. But I have grounded CIN directly, and observed VCC with an oscilloscope, there is no voltage abrupt change in VCC below VULO.

So I would like to ask what else will trigger the smartSD protection and cause the FAULT pin to output a low level, thank you!

[Cristiana SCARAMEL]

Hello @ZHuan.4​ and welcome to the ST Community.

I confirm that the FAULT signal is set low in case VCC UVLO is detected, or in case the SmartShutDown comparator triggers an event.

Could you share more details about your application?

Are you using a custom board and/or custom firmware?

How are you monitoring the FAULT status?

[ZHuan.4]

I am using a control board made by our company and firmware written by myself.

FAULT triggers TIM's break interrupt, which I use to monitor it.

[Cristiana SCARAMEL · Accepted solution]

Hi @ZHuan.4​,

did you configure the GPIO PB12 as a pull-up?

[ZHuan.4]

No, I didn't configure it as a pull-up resistor.