Can't Boot after changing from STM32F401RBT6 to STM32F401RET6

mendez · ‎2024-11-21

Hello,

After changing from STM32F401RBT6 to STM32F401RET6, I can no longer put the chip in boot mode. All I did was to replace the chip; my understanding is that both chips are identical except memory. Does it need additional changes?

Thanks for the help!

SofLit · ‎2024-11-21

Hello,

Both chips have the same boot. Only Flash and RAM sizes are different.

As you replaced the chip check your PCB soldering.

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mendez · ‎2024-11-21

Yeah that is what I have been focusing; I read the AN2606 and everything is identical. Thanks again!

SofLit · ‎2024-11-21

Meanwhile you need to check the AN2606 "STM32 microcontroller system memory boot mode"

Sections:

30 STM32F401xB(C) devices

31 STM32F401xD(E) devices

What interface you are using for bootloader?

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Ozone · ‎2024-11-21

> All I did was to replace the chip; ...

What exactly you are talking about ?
Unsoldering the MCU from a board and resoldering a new one ?
Or having different PCBs populated with the RET6 instead of the RBT6 ?

Anyway, have you done something beyond visual inspection, i.e. electrical checks ?
Like comparing current consumption, checking for heated spots, etc.