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STM32F373CCT6 power supply question

mosscool
Associate II

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

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