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I am working on custom board design for STM32F723ZET6 MCU.

Here is part of schematic.

enter image description here

All the VDD/VDDA/VBAT pins are connected to 100nF bypass capacitors and few 4.7uF capacitors between VDD and GND. The capacitors are also put as closely as possible to VDD pins in PCB.

enter image description here

I am trying to program the board using ST-link V2 programmer (Original one from ST) and following SWD pins: VDD, SWDIO, SWCLK, nRST, GND

I am getting following error on ST-link utility:

enter image description here

I have also tried various options "Connect under reset", lowering the SWD frequency but nothing seems to work.

One weird thing i noticed in the board is, I am not getting 1.2v at VCAP1/2 pins. Is it causing the problem ?

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  • \$\begingroup\$ Comments are not for extended discussion; this conversation has been moved to chat. \$\endgroup\$ – Dave Tweed Jul 5 '18 at 18:14

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