STM32f103vdt6 design

[AGERE.192]

Hello!

I have designed a custom board, i have attached the schematic of it. My problem is that I have an ST-link v2 and i cant connect to it, i get target not found. Is my schematic correct or I have missed something? I have power and ground on all necessary pins on my board. I connected VDD, GND, SWDIO and SWCLK to my board from the ST-link, I used pins 1, 7, 9, 20. I tried to swap the pins of the data and clock signals, and all the settings in the ST-Link utility. My programmers firmware is up to date.

Best regards,

Attila

[Tesla DeLorean]

Check the voltages

Check part orientation

Check level on NRST pin

With BOOT0 pulled high try talking to the ROM based System Loader, via USART1 PA9/PA10, at 9600 8E1 send an 0x7F data byte, and check for response. Use something like RealTerm which can send hex bytes.

[TDK]

VBAT should be connected to VCC.

Is pin 73 really NC on the package? Seems odd.

[AGERE.192]

I have checked the voltages, all ok. The part oriantation indentation is in the up right corner. For some reason the NRST is 0.26V, but if I put a wire I can bring it up to 3.2V. But still no luck. I tried with an arduino the BOOT0 method with 0x7F data byte. I checked the answer on the oscilloscope and there was some response data.

[AGERE.192]

I tried that too, with no luck. If Im correct it is NC, I attach the datasheet.

[TDK]

If NRST wants to be 0.26V, voltages are not okay. Indicates a problem in your power supply scheme somewhere.

[AGERE.192]

This is akward for me too, and the second odd thing is that PA2 is shorted to VDD in the interior of the IC. But I measured the voltages on all the pins and are ok.

[waclawek.jan]

Did you measure *directly* on the pins? I am aiming at bad solder joints.

Did you measure also VDDA/VSSA?

Is the text on the chip bottom-up?

JW

[Tesla DeLorean]

Definately sounds like you've got the device rotated.

NRST will be low absent a VDDA supply on the correct pin.

Show clear, in focus, high resolution photo of the chip on the board.

Don't confuse the mold ejector marks for pin 1 designation

[AGERE.192]

Yeah. I have thinked about this, and I measured all the voltages on the top of the pins, near the package with really thin probes. I measured all of the vdd/vss pins. No, the text is up-buttom.