Sujet : Re: Pi 5 and NVMe SSD
De : Pancho.Jones (at) *nospam* proton.me (Pancho)
Groupes : comp.sys.raspberry-piDate : 23. May 2024, 11:50:04
Autres entêtes
Organisation : A noiseless patient Spider
Message-ID : <v2n70q$1lih1$3@dont-email.me>
References : 1 2 3 4 5 6 7
User-Agent : Mozilla Thunderbird
On 23/05/2024 10:58, The Natural Philosopher wrote:
On 23/05/2024 09:44, Pancho wrote:
On 23/05/2024 09:03, Richard Kettlewell wrote:
The Natural Philosopher <tnp@invalid.invalid> writes:
No problems with wimpy power supplies? apparently pi's and ssds take a
lot of current at boot time
>
It’s the official PSU.
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I bought a Pi5 without the official PSU, or even a Pi4 official PSU. It would run for a minute or two and then crash. Completely unusable. It is now fine with the official PSU.
There is an entry in config.txt that 'tells' the pi that it has a high power power supply.
Otherwise it has to do an appl-ish sort of negotiation with its PSU to see if it is.
No, I was talking about the USB standard. This is from memory, so take with a pinch of salt.
I have high wattage USB C chargers for mobiles, pads etc. They quote 20 or 25 watts. Given I wasn't using any USB power draining devices, I assumed this would be OK for the Pi 5.
However, it wasn't OK, Pi 5 crashed. When I looked at the USB small print, the charger achieved a high wattage by boosting the voltage from 5v to 20v, still using a relatively low amps. AIUI, this is USB standard.
However, the Pi requires 5v (maybe even 5.1v) and a high 5 amps. Which is totally non-standard and makes the Pi 5 USB PSU effectively bespoke. I suppose, but haven't tested, the Pi 5 PSU is also no good to fast charge your mobile.
Presumably there is some good cost justification, but I don't like it. The Orange Pi 5 is fine on a standard USB fast charger, but it is generally lower power than the Raspberry Pi 5.