Hello expert,
I cut off the MCU SPI wire to make the TPS92520 enter limp home mode, and then I cut off the UDIM wire between MCU and TPS92520 so the UDIM PIN of TPS92520 is floating, noting connected. I find the output current is right as I set to NVM, and the voltage of UDIM is 3.8V. What is the internal circuit of the UDIM PIN? Why it can keep high voltage level although there is no external pull up?