Re: Pi 5 and NVMe SSD

On 23/05/2024 11:50, Pancho wrote:

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.
>

>
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.
 

5 Volts at 5 amps is within the USB power spec, albeit less commonly used.
--
Chris