Unable to connect to STM32U5

[brohr01]

Evening everyone,

I am working on the board bring up of a custom board using an STM32U59GVJT6Q and I am unable to connect to the chip through CubeProgrammer with an STLINK-V3SET over SWD. I get the following error, "Error: No STM32 target found!...".  I am supplying the MCU with 1.8v

I have verified NRST is high(1.8v) and have tried various combinations of mode and reset modes in cubeprog.  I started checking voltages at the MCU and the only odd thing I could find was 1.8v on pin VLXSMPS. I believe the MCU should be outputting 1.1v on this pin, routed through a 2.2uH inductor and feeding the VDD11 pins.

Any ideas or other things to check please let me know, Thanks!

[TDK · Accepted solution]

Is part orientation correct? Pin 1 is on the bottom left when text on chip reads from left to right.

Solder bridge between VDDSMPS and VLXSMPS? or other pins?

Does STM32CubeProgrammer see 1.8V?

[brohr01]

You nailed it, I have the chip orientation 180degs off. I didnt even notice this chip has 2 round markings on it, I glanced and saw the large circle marking in the top right hand corner and oriented it off of it.