STM32F373CCT6 power supply question

[mosscool]

found that the VDDSD pin is in the state of 2.5V during the test, when I removed the stm32f373 from the PCB, the voltage at the pad is 3.3v ,but when I soldered the chip back on, it was about 2.5V again，I would appreciate it if you could help

[Tesla DeLorean]

Please edit, fix the title/summary and put the complete question/details in the body of the message. 

Review the PCB net list, check naming and islands on non-connectivity.

[mosscool]

ok,I've edited my post

[TDK]

Verify part orientation. Pin 1 is bottom left when text is oriented normally.

If that's not it, try shorting R2. Those nets (VSS/VSSA) should be tied directly. Similarly try shorting L1. VDDA should be supplied before or at the same time as VDD.

[mosscool]

I swapped the inductance and resistance to 0 ohms, and it still didn't work