ELECTRONICS
Raspberry Pi Zero Soft-Latch Power Switch
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CASE ANALYSIS
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.
Key decisions
- Use a TPS2042 load switch controlled by a momentary pushbutton and held on by a GPIO from the Pi
- Add a diode to prevent backfeeding into the GPIO when the button is pressed
- Include an RC network to debounce the button and provide a soft power-off delay
When to reuse this
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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