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MCU should control 8V LDO EN pin #1

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opened 2022-07-17 23:43:07 +08:00 by topquark12 · 3 comments
topquark12 commented 2022-07-17 23:43:07 +08:00

Allow LD supply (8V) to be controlled by MCU with hardware pulldown to prevent unwanted current from passing through LD+ and LD- pins during power on.

Allow LD supply (8V) to be controlled by MCU with hardware pulldown to prevent unwanted current from passing through LD+ and LD- pins during power on.
sb10q commented 2022-07-19 09:33:50 +08:00
Owner

What happens during power-off?

What happens during power-off?
topquark12 commented 2022-07-19 10:10:53 +08:00
Poster

Power off is clean, attached power on and power off waveforms after hacking a wire to control LD supply through MCU.

Power off is clean, attached power on and power off waveforms after hacking a wire to control LD supply through MCU.
ScreenImg (18).png
60 KiB
ScreenImg (17).png
59 KiB
ScreenImg (18).png ScreenImg (17).png
sb10q commented 2022-07-19 10:11:39 +08:00
Owner

Does this resist fast power cycles?
They can happen e.g. with a problematic PoE switch.

Does this resist fast power cycles? They can happen e.g. with a problematic PoE switch.
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Reference: sinara-hw/kirdy#1
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