2025-03-06 4:37 AM - edited 2025-03-06 5:42 AM
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
2025-03-06 5:26 AM
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.
2025-03-06 5:43 AM
ok,I've edited my post
2025-03-06 5:53 AM
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.
2025-03-06 8:24 AM
I swapped the inductance and resistance to 0 ohms, and it still didn't work
2025-03-06 9:08 AM
What does your A2V5 Net connect too?
2025-03-06 10:25 AM
Can you show a hi res in focus picture of the board?
2025-03-06 8:04 PM
Power the AD7915,and vddsd is in the state of 2.6V when i start sdadc, but it is in the state 0f 3.01 when i stop sdadc
2025-03-06 8:14 PM
this?
2025-03-07 6:59 AM - edited 2025-03-07 7:00 AM
Was hoping for a picture of the physical board in the state that produces the error (with the chip soldered). For example: