Can i use a Type C header to power the raspberry 4 ?

[vinhalplay]

Hey guys , been looking for ways to power the Raspberry pi 4 inside my PC case for a while now . I'll be using as stats monitor... And I can find tons of power supply connecting to a normal power plug. But im trying to get a better solution by connecting inside into my motherboard. I have a spare type C header since my case doesnt have front panel type c connection, i came to this product https://www.amazon.com/gp/product/B07V8 ... HST6&psc=1. Will it work ? Is there any other option?

[pcmanbob]

Hi.

The maximum current a USB3 port can supply is 900mA according to the specification , which may not be sufficient to boot / run a pi 4,

if you have a spare molex connector on your power supply you could connect a USB type C connector to the 5V and ground and use that to power your pi.

[Imperf3kt]

The maximum current a USB3 port can supply is 900mA according to the specification

Isn't the specification that it should supply a minimum of 900mA?

[pcmanbob]

This is what I went by.

In the USB 1.0 and 2.0 specs, a standard downstream port is capable of delivering up to 500mA (0.5A); with USB 3.0, it moves up to 900mA (0.9A). The charging downstream and dedicated charging ports provide up to 1,500mA (1.5A).

Yes it can supply more if its a charging port but the pi will not activate the charging option so 900mA would be the max.

[hippy]

The problem seems to me that you cannot look at USB specs and determine what any particular device's USB socket will deliver. Designs appear to be whatever they are so long as they are deemed to meet the spec.

There may be some clarity in what tests need to be passed to earn the right to slap a USB logo on it, but I've never seen those, and it seems anything goes. Up to, and even over, seem to be compliant from the bits I have read.

My take on it would be that USB ports haven't been designed for 2A or above, so trying to pull 2A or more for a Pi is a path not worth walking. Just use the main 5V PSU if that has the 2A or whatever going spare.

I'd personally not use either because I don't want the Pi's power going off just because the PC's has. I'd use a separate PSU wired to the same mains inlet socket.

[drgeoff]

The maximum current a USB3 port can supply is 900mA according to the specification

Isn't the specification that it should supply a minimum of 900mA?

Yes, my interpretation is that a port which claims to comply with the USB3 host spec should be able to supply at least 900mA. Not that it should not supply more than that.

[LTolledo]

well... lets just do it the old fashioned way....

plug it in
try powering from it
if it runs fine....without any problems... then its fine...
if it runs but with problems.... then its not applicable...

...."I don't care what anything was designed to do. I care about what it can do"....
---Gene Kranz, Apollo 13 Movie

[hippy]

well... lets just do it the old fashioned way....

plug it in
try powering from it

And what if it damages the PC, blows an internal fuse or burns a track clean off the board ?

Not saying it will, and it probably won't, but what if it does ?