STM32mp157F DK2 burned

[karu2003]

First acquaintance with STM32mp157FDK2. A couple of weeks ago I bought two sets to try. In a week I figured out how to put together my image with Yocto. And today what was supposed to happen happened. I connected the KIT to the power supply with PD3. KIT is broke. The thermal camera shows strong heating. STPMIC1APQR short circuit STPMIC1APQR. burned out. Unsuccessful test STM32mp1.

 

Andrew.

[AScha.3]

How did you power the kit ?

Check real voltage of your power supply output.

(Your description telling nothing about, but something like this is typical for too high voltage or ESD event.)

[karu2003]

his is PD3. The voltage can be up to 20V. How do ST manage CC1 and CC2?  have ST any overvoltage protection? 

for ESD why didn't it work ESDA7P120-1U1M

[AScha.3]

Really 20V ?

from manual UM2637 :

+

the STPMIC ds :

 

[PatrickF]

HI @karu2003 

I'm sorry to see that you had hardware issue with your board.

The STM32MP157F-DK2 is working without issue with any USB Type-C charger which are USB certified.

As per USB-C and Power Delivery standard

• charger should not provide any supply until CC lines are loaded
• charger should always start with 5V supply until there is successful Power Delivery negotiation for higher voltage

The STM32MP157F-DK2 has no power delivery interface, so it is not possible to request something else than default 5V. That's the case of many USB-C powered products.

On STM32MP157F-DK2, the CC lines are only used to check that the charger pull-ups are defining 3A capability according to USB standard.

The STM32MP157F-DK2 has only ESD protection and no overvoltage protection on 5V input.

 

Your board could be defective, so you could ask for a replacement where you purchase it.

But I suspect the STPMIC1 burn is more related to a short circuit on its external components (usually inductors) which is quite easy with a development board (e.g. probe slip or metal stuff touching the board).

Ultimately, you could also try to replace the STPMIC1A (but need some experience in soldering and adequate tools)

Regards.