stm32f429 custom board - schematic review

[harry123]

• I am  using my own custom board which is replicate of stm32f429 disc1 development board.
• I replaced main mcu chip i.e stm32f429 and stlink chip from my disc1 board to my custom board. After using my custom board for for many days now it stopped working.
• The board is getting heated and st-link not detected error is getting popped one i connect usb power supply.
• I unable to find the reason for its failure.I have attached my custom board schematic.
• Now I want make another custom board with external debugger what changes I have to make in the schematic to make my board work like disc1 board.

[AScha.3]

Where is the 3v3 regulator ?  USB -> has 5V , so how cpu is powered ?

[harry123]

• It is powerd through USB same like stm32f429 disc1 board.
• I want to replace with that with external power supply and debugger.

[AScha.3]

But its not in the circuit - i cannot see it... 

like this:

on F429 is here 3V supply:

 

 

[AScha.3]

>The board is getting heated and st-link not detected error 

What is getting hot ?  F429 , F103, or both ?

(Typical for a fried cpu is "heat", maybe overvoltage on a pin or by ESD ... )

 

>

• Now I want make another custom board with external debugger what changes I have to make in the schematic to make my board work like disc1 board.

just see a "BlackPill" circuit, attached, for F4xx, this is what you want ;

+

a working st-link , you need then.

Just...not the full JTAG , only swd/swc is fine:

-->

 

[harry123]

• Please suggest  which debugger to use.
• To use UART can I make use of debugger or should I use usb to ttl converters.

[AScha.3]

>Please suggest which debugger to use.

Debug in IDE ? GDB or OCD . (I dont understand your question...)

 

>To use UART can I make use of debugger or should I use usb to ttl converters.

Depends on the debug probe, you want to use: st-linkV3 has serial , rx /tx at 3v3 level.

If your st-link dont have serial, need a usb to ttl converter to use usartX for tx/rx to PC terminal program.