Is it possible that I burn STM32 chip ?

[bianchi77]

Hey guys,

Is it possible that I burned my STM32 chip when I did drag soldering on it ?
it's about 20 seconds with 420 degree celcius ....

The debugger can not detect my chip.....

Any ideas ?
thanks

 

[yura717]

I think 420 C for 20 sec is too much

 

[alexan_e]

Drag soldering doesn't take more than a few seconds per side, then you can pause so that the chip cools down and proceed with the next side.
Your temperature is also on the high side.

 

[tpetar]

Hey guys,

Is it possible that I burned my STM32 chip when I did drag soldering on it ?
it's about 20 seconds with 420 degree celcius ....

The debugger can not detect my chip.....

Any ideas ?
thanks

This is high amount of heat, better decrease temp to 200C and soldering time. I dont see need for 20sec soldering, time can be shorter.

With 420C during 20sec you probably kill uC.


Best regards,
Peter

 

[bianchi77]

or because of I haven't put VDDA and VREF ?

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I tried with flash loader from ST, boot0=1 and boot1=0, it said can not detect any uC, probably my uC is death already, don't you think so guys ?

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is there any way to test if the chip is failure ?
thanks

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the error I got :

 

[bianchi77]

I'm not sure the temperature I was using, only guessing on 420 and not 20 seconds long....I tried again on doing it, it's about 3 to 4 seconds....
there's no temperature sensor on my solder....only guessing it's 420, since it's 60 watt, probably the uC still alive but something wrong,
any ways to check it ? thanks

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unrecognized device

 

[yura717]

> any ways to check it ? thanks
Do you have the tools ? /osciloscope/

 

[tpetar]

I'm not sure the temperature I was using, only guessing on 420 and not 20 seconds long....I tried again on doing it, it's about 3 to 4 seconds....
there's no temperature sensor on my solder....only guessing it's 420, since it's 60 watt, probably the uC still alive but something wrong,
any ways to check it ? thanks

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unrecognized device

I supose soldering iron heater is direct on mains voltage without transformer.

Look to get decent soldering station with temperature regulation 40W is enough. Its cheap today, see ZD-931 or similar 30-40eur.

If uC is damaged, before new resoldering will not give some results, you need second healthy uC.


Best regards,
Peter

 

[bianchi77]

Thank you guys, it's working now...I tested for the code....no problem