The scenario
Design a soft-latch power circuit for a Raspberry Pi Zero that uses a momentary pushbutton to toggle power on/off, using a TPS2042 load switch and a GPIO hold signal.
What is in this drawing
Read the decisions behind it.
01
Use a TPS2042 load switch controlled by a momentary pushbutton and held on by a GPIO from the Pi
02
Add a diode to prevent backfeeding into the GPIO when the button is pressed
03
Include an RC network to debounce the button and provide a soft power-off delay
When a battery-powered device requires a soft on/off controlled by a microcontroller’s GPIO after a momentary button press.
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