By mistake I connected an external USB port and it turns out that through one of the data lines I connected the 5v of the USB port, the result, the MCU was dead.
MRE R0.6.0 Assembled by JLCPCB
STM32F427VGT6
TLE8888 and TC4427Assembled with hot air station
AV9 as output
AV8 Analog
VR
GP5 - GP6 12v
Removed:
R19
R17
R18
R15
R53
R85
R86
R84
This is the USB port that I am connecting, I have already tested it with more boards and it works perfectly
The exact connection that was made was the following:
USB GND -> Pin 17 - H4
USB 5V -> Pin 16 - J1
USB D- -> Pin 15 - J2
USB D+ -> Pin 19 - H2
The 12v power supply was normally connected, no additional sensor was connected.
After correcting the error it no longer reacted to the USB connection, when disassembling I found that between TP3 and TP0 (3.3V and ground) it was shorted, the TLE8888 and the MCU were very hot, and it was consuming 950 mA from the power supply at 13 volts
According to what I could see in the datasheet, pins PA11 and PA12 are 5V tolerant, but I could be wrong.
If it is not tolerant to 5v, should D16 be replaced with one at 3.3v?
I am probably saying something stupid
After changing the MCU, everything was resolved, except that U31 smoked when connected to 12v again. It may be related or not, I will open another issue with this detail
Any clarification or additional information please let me know.
By mistake I connected an external USB port and it turns out that through one of the data lines I connected the 5v of the USB port, the result, the MCU was dead.
MRE R0.6.0 Assembled by JLCPCB STM32F427VGT6 TLE8888 and TC4427Assembled with hot air station AV9 as output AV8 Analog VR GP5 - GP6 12v
Removed: R19 R17 R18 R15 R53 R85 R86 R84
This is the USB port that I am connecting, I have already tested it with more boards and it works perfectly
The exact connection that was made was the following:
USB GND -> Pin 17 - H4 USB 5V -> Pin 16 - J1 USB D- -> Pin 15 - J2 USB D+ -> Pin 19 - H2
The 12v power supply was normally connected, no additional sensor was connected.
After correcting the error it no longer reacted to the USB connection, when disassembling I found that between TP3 and TP0 (3.3V and ground) it was shorted, the TLE8888 and the MCU were very hot, and it was consuming 950 mA from the power supply at 13 volts
According to what I could see in the datasheet, pins PA11 and PA12 are 5V tolerant, but I could be wrong.
If it is not tolerant to 5v, should D16 be replaced with one at 3.3v? I am probably saying something stupid
After changing the MCU, everything was resolved, except that U31 smoked when connected to 12v again. It may be related or not, I will open another issue with this detail
Any clarification or additional information please let me know.