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Raspberry Pi admits to faulty USB-C design on the Pi 4

arstechnica.com

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Re: Raspberry Pi admits to faulty USB-C design on the Pi 4

#161

Post by Florin_Andrei »

heyoni wrote: post #115
Florin_Andrei wrote: post #91

Earlier quoted context omitted.

> From a Pi consumer perspective, this is not that big of a deal. Well, didn't seem that way to me when I bought an RPi4, tried it with two different power supplies and cables, and it didn't work at all. I thought the device was DoA so I did an RME with the distributor. Today I learned a different story, and now I'll have to scrounge up yet another cable to see what the true story is. The one cable I have not tried m…

Would be less of an issue if they included a usb c power cable but they don’t :/

Yeah.

At least the "dumb" cable I use in the car with my phone is dumb enough to feed power to the RPi4 anyway, so I'm going to keep the device and just remember to only use it with cheap, dumb cables.

I was very confused a few days ago when I plugged it into the MacBook Pro power supply, thinking "this ought to have more than enough juice for the Pi" - except the thing stayed dead and silent altogether. :)

Re: Raspberry Pi admits to faulty USB-C design on the Pi 4

#162

Post by ageofwant »

tracker1 wrote: post #89

I mentioned in an earlier thread, I had so much trouble using any charger I already had with the 3B+, I just assumed it wouldn't work with most chargers this time either and ordered a kit with an official one.

Same, I traced it back to my penchant for buying cheap shit cables. Measure the voltage at the back of the USB connector on the Pi3, it should be > 4.9 always.

Re: Raspberry Pi admits to faulty USB-C design on the Pi 4

#163

Post by Luyt »

Sinergy2 wrote: post #75
kllrnohj wrote: post #23

Earlier quoted context omitted.

They chose to use a standard so yes it's a problem that they didn't follow it. It's pretty cut & dry here. Fortunately in this case it fails to 0V so it's not a dangerous or damaging failure, but still the spec literally hands you a schematic. Is it that hard to just copy it? Why did they even try to be clever and use their own design in the first place just to save a single 5.1k ohm resistor?

I can give the automotive electronics perspective here. Suppose that resistor costs 2c, including the actual part cost, PCB space, pick-and-place machine time (inc. more frequent spool replacement). Further suppose you expect to sell one million of this device. $0.02 x 1E6 = $20k If you are the circuit designer making, say, $150k, you just justified about a month of your salary (after accounting for benefits and othe…

Those small SMD resistors come on a reel, and they're typically much cheaper than 2 cent: more like 0.1 cent. Still, that's $1000 for one million units.

Re: Raspberry Pi admits to faulty USB-C design on the Pi 4

#165

Post by Luyt »

vardump wrote: post #145

I have two RPi4B 4GB models. They work perfectly with the very cheap PSU/charger ($8) from the Raspberry Pi Foundation. $8 is less than a cost of a USB-C cable. If you want to complain something about the product, I think unfinished software would deserve more attention. The current desktop performance doesn't reflect the capabilities of the system. I guess it'll significantly improve once OpenGL ES 3.2 (and hopefull…

There is a 64-bit Kali Linux image for the Raspberry Pi.

https://www.offensive-security.com/kali-linux-arm-images/

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