This is the power supply system in the nrf52832 development board. The manual means that when 1 and 2 are not powered, 3 is used for power supply, that is, cr2032 is used for power supply.
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But when 3 is used for power supply, assuming 1、2 is closed. Vsupply is 0, so the AND gate and load switch are both closed
And the input pin of this load switch is Vsupply. When Vsupply has voltage, it means that 1 or 2 is used for power supply, so the output of the AND gate below is low level, nmos is not turned on, and pmos above is not turned on.
I feel that the logic is very messy when I sort it out. I hope friends who are familiar with hardware design can guide me.
I have just started PCB design and I am really confused. I feel that the idea is wrong