STM32L073VBT6 COST 100mA，Help

[ren yong]

Posted on March 14, 2018 at 08:09

My product with stm32l073vbt6 ran 1 week or longger,the mcu was broken.

All io and peripheral on broken mcu can run as normal,But the power consumption up to 100mA not 100uA!

I have removed all other part but mcu and supply 3.3V my own，the state  not changeï¼�

How can a mcu cost 100mA without any other chip when all function ok？

[Bogdan Golab]

Posted on March 14, 2018 at 08:39

Single board affected? Do you have more boards like this?

Is the MCU hotter now? It's about 0.3W of dissipated power on small...

Are I/O disconnected to prove that the MCU the root cause of the problem?

Can you share the schematic? Just wonder if theoretically this amount of current is possible through I/O

[ren yong]

Posted on March 14, 2018 at 08:52

ALL IO float already，and I had tried connect the reset PIN to GND. It proved that the current cost internal!

[T J]

Posted on March 15, 2018 at 01:10

the circuit looks ok, you blew it up...

there is no signs of 6V 12V in your circuit..

what did you do ?

sometimes a static charge blows the chip whilst it is being handled before mounting..

this may be your issue.

do you use Antistatic precautions ?

[ren yong]

Posted on March 15, 2018 at 09:48

The circuit with diff voltage all with mos or res as below.

[henry.dick]

Posted on March 15, 2018 at 03:05

'

How can a mcu cost 100mA without any other chip when all function ok？'

When it is abused, damaged, or otherwise mis configured.