STM32F410- VCAP voltage not generated, Unable to find the target through ST-Link

[ndorugad]

Hello,

Above is the schematic for the board. I am facing issue for Target not found while connecting with ST-Link.

1. The Vcap1 voltage is 0.

2. What could be the reason for not getting 1.2v at C11. vcap_1 voltage?

Can you please refer the above diagram and suggest solution for the same?

[Tesla DeLorean]

Perhaps power input side issues, or ones of part orientation. 

[TDK]

Probably part orientation is wrong. Pin 1 is on the bottom left when text is oriented from left to right.

Is it powered? Official programmers do not provide power.

Perhaps upload a more legible schematic.

[ndorugad]

Hello Guru,

Here the attached schematic for the same.

[Tesla DeLorean]

Please provide a large,  clear and in-focus image of the part on the circuit board surrounding it.

Check the 3.3V supply at the side of the VCAP pin. Check Netlist.

Has this board worked previously? New batch? New F410 purchase?

[ndorugad]

Thanks for the reply, this is the first proto with STM32F4, other sections are verified.

previously designed for renesas microcontroller, this version is switched to STM32F410.

[ndorugad]

One mre observation. i can get 1.17v at PA0 pin,  BYPASS_REG pin. but no voltage at VCAP.

should i connect the PA0 to 3.3?  does it the reasone that i am not getting device detected at ST-Link

[ndorugad]

What is the PDR level recommended, in my case i have connected the PDR to 3.3V. is it ok?

Also could you please check the schematic and help me to find the issue.

As we are switching from Renesas to STM32. i need to make it up on prio.

[ndorugad]

 Here is the top view of PCB.

[TDK]

So chip is treating PA0 as VCAP. Sure sounds like a part orientation issue. Unfortunately, your picture is not clear enough to read the text on the chip.

Pin 1 on the chip is here when text is oriented as shown: