STM32H723ZGT6 accidental Vcore overvoltage

[vjaz]

Hello,

I designed a custom board with an STM32H723ZGT6.

It worked fine, then, long story short, this happened:

I accidentally connected the VCAP pins (Vcore voltage) to 3.3V, then switched the board on. After about 2...3 seconds I realised something is wrong, because the LED I expected to blink, remained off, so I switched the board off immediately. Then I disconnected VCAP from 3.3V, and switched the board back on.

Now it seems to work properly, the LEDs are blinking and the ethernet also works. On VCAP I measure 1.38V, which is normal.

Is it possible that the MCU survived entirely the 3.3V Vcore voltage for a couple of seconds?

Or can there be some partial damage that cannot be seen now?

I haven't found any maximum for VCAP in the datasheet.

[TDK]

> Is it possible that the MCU survived entirely the 3.3V Vcore voltage for a couple of seconds?

> Or can there be some partial damage that cannot be seen now?

Both are possible, the former is more likely if the chip is working properly now.

> I haven't found any maximum for VCAP in the datasheet.

They're in there, in 6.3.1 General operating conditions.

 

[vjaz]

Thanks for your reply! I hope, you're right.

(Sorry, it was not clear, I meant that there is no entry for Vcap/Vcore in the "Absolute maximum ratings" part.)