4 ms·
Many voltage regulators have 'power good' pins that you can tie to the MCU's reset line, though.
by leggomylibro 7y ago
Many voltage regulators have 'power good' pins that you can tie to the MCU's reset line, though.
- neltnerb 7y agoAnd if you don't have this, I posted this circuit example I just made for a delayed power turn on time above. Capacitor is about 5 cents, the transistors are about 6 cents each. If you need it you need it, but power good to the reset line is better. https://i.postimg.cc/Df9N8fM5/delayed-turn-on-circuit.png https://i.postimg.cc/Df9N8fM5/delayed-turn-on-circuit.png Or just put a capacitor after the reset line pullup so that it effects delayed turn on during boot.
- leggomylibro 7y agoOh, neat trick - thanks for sharing!
- Tempest1981 7y agoWhat is the voltage drop across D1 and Q2? Is that ever an issue?
- neltnerb 7y agoThe drop across D1 can be significant, using a Schottky helps. Usually within the tolerance of the power supply in any case. But a capacitor on the reset pin is pretty good ;-)