I am working with STM32F098 mcu, it has NPOR pin. Reading the documentation I understood that I have to externally pull this pin low until a stable VCC will be present. When it is present, I have to leave it high impedance as it has internal pull-up.
For this I use TPS3825:
The TPS3825 helds the #RST line low when #MR is low or until VCC reaches more than 3V. My problem is that in my circuit the NPOR pin acts like an output pulling the #RST line low. After I cut off the NPOR line from the #RST net the mcu started to work. When measuring voltage on NPOR pin then it is 0V.
How does this NPOR pin work really? Did I understand something wrong? I would appreciate all help.