Im in the process of designing a carrier board for the CM5 but having some difficulties figuring out the power.
Id like the CM5 to be powered by any standard PD charger via usb c so would like to implement somthing like this board does
https://pichondria.com/usb-pd-2-0-3-0-t ... -tutorial/
I think this one is negotiating a PD contract on the input then converting it to 5V 5A for output but in a "dumb" way as it requires you to modify the Pi config to leave USB max current on so the pi isnt being told its receiving 5V5A via a handshake so without this config mod it would put its self in the 5V3A mode
Even better is this board
https://wiki.52pi.com/index.php?title=EP-0225
it appears it negotiates with the input source takes power in converts it to 5V5A then makes a separate negotiation with the Pi informing that it can do 5V5A.
i can figure out the power input negotiation but what is the most efficient way to convert that power input say 12V3A 15V3A or 20V5A down to 5.1V5A then pass that along to an IC to do the negotiation with the Pi and what IC might they be using for that step?
Id like the CM5 to be powered by any standard PD charger via usb c so would like to implement somthing like this board does
https://pichondria.com/usb-pd-2-0-3-0-t ... -tutorial/
I think this one is negotiating a PD contract on the input then converting it to 5V 5A for output but in a "dumb" way as it requires you to modify the Pi config to leave USB max current on so the pi isnt being told its receiving 5V5A via a handshake so without this config mod it would put its self in the 5V3A mode
Even better is this board
https://wiki.52pi.com/index.php?title=EP-0225
it appears it negotiates with the input source takes power in converts it to 5V5A then makes a separate negotiation with the Pi informing that it can do 5V5A.
i can figure out the power input negotiation but what is the most efficient way to convert that power input say 12V3A 15V3A or 20V5A down to 5.1V5A then pass that along to an IC to do the negotiation with the Pi and what IC might they be using for that step?
Statistics: Posted by adamtocher — Tue Jan 06, 2026 1:04 pm — Replies 1 — Views 60