overheating / dead 3.2 ?

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Gadget999

Well-known member
Yesterday i had a Teensy 3.2 fail

it would intermittently power up - then stopped working

I noticed the chip was quite warm


today i was reading a frequency from another board using a teensy 3.2 and it was getting quite warm

this 3.2 is still working fine - should it be getting hot ?

is the chip now damaged ?

can it be repaired ?
 
My experience has been that, after you apply 12V onto some Teensy pins, even for a short while, the Teensy will stop working, and will become quite warm when powered up.
Presumably the MOSFETs in the chip fail in avalanche breakdown and end up becoming shorts, and thus the chip just ends up consuming a lot of current, turning it into heat, without being able to do useful I/O.
 
i programmed this sketch

Code:
//
// Teensy 3.x/LC simple internal temperature
//

#include <InternalTemperature.h>

InternalTemperature Temperature;

void setup()
{
  Temperature.begin();

  Serial.begin(115200);
  while (!Serial);
}

void loop()
{
  Serial.print("Temperature: ");
  Serial.print(Temperature.readTemperatureC(), 1);
  Serial.println("°C");
  delay(1000);
}


the thing started off at 68C and kept climbing !
it got to 92C and i decided to fit a heat sink
it came back down to around 68C

i then burnt my finger and unplugged it !

looks like i could use this to boil a kettle !

what is wrong ? can it be fixed ?

(with a decent sized heat sink it settles around 55C)
 
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