General > General Technical Chat

Pi "foundation" gets fatter

<< < (16/18) > >>

langwadt:

--- Quote from: bd139 on September 28, 2021, 09:12:49 am ---See RPi2 in the message. This was an issue I raised on the forum, which was of course deleted like my other post...

You can't evaluate the new ones as the public schematics are incomplete.

--- End quote ---

https://github.com/raspberrypi/documentation/blob/develop/documentation/asciidoc/computers/raspberry-pi/raspberry-pi-schematics.adoc

only switchers ...

eti:

--- Quote from: LoveLaika on September 27, 2021, 02:09:36 am ---Wow. Who knew there was so much hate for the Pi.

So, what do you guys like to use in place of the Pi for what people use it for? UDOO? Pine? Beaglebone? Wandboard? (or the even more popular Banana Pi?) For me, Pi Zero is hard to beat in terms of its size.

--- End quote ---

"Hate"? 😏🤦

Merely because not every single thread response is from someone gushing and extolling the myriad, implied INFINITE "virtues" of the silly little toy board that isn't designed, marketed or supported in a professional manner?

To a fervent apologist, the antithesis of his world view is always "haters". How tedious, such a thundering bore.

Monkeh:

--- Quote from: bd139 on September 28, 2021, 08:26:08 am ---... NCP1117 .... same circuit AFAIK now ...

--- End quote ---

Not for many, many years, and all the relevant details are on the (heavily redacted, yes) schematic which is available.

If you're going to rant and whinge, at least be right.

PlainName:

--- Quote ---To a fervent apologist, the antithesis of his world view is always "haters"
--- End quote ---

There is that. But just as not everyone concerned with climate change is a rabid eco-warrior, not everyone that isn't wound up mightily by the Pi is a 'fervent apologist'.

OTOH, I think it's pretty clear from this thread that you really and truly hate the Pi and anything connected to it. It's not enough for you to make sure you don't sully your hands, you need to stop anyone else doing so as well.

tom66:

--- Quote from: bd139 on September 28, 2021, 08:26:08 am ---There is literally a single NCP1117 between 5V0 USB input and 3V3. If you've got your usual wall wart with added inductor then any current dips can sink that below the dropout voltage of the regulator which means your 3V3 rail bombs. I've actually seen this on a scope on an RPi2 and it's the same circuit AFAIK now. That drives all the other LDOs and the BCM core as well which all lose regulation. This causes the BCM core to BOD and reboot outside of OS control.

--- End quote ---

Only the Pi 1 used the NCP1117.
Pi 2 used an off-the-shelf ONSemi part if I recall correctly.
Pi 3 onwards have used a semi-customised Diodes Inc. part (I believe the voltages are set in the factory; the part is standard.)

Also, the BCM core on Pi 1 was powered by the 5V0 rail, not 3V3.  The BCM2835 had an onboard switchmode converter to provide the 1V0.  Remember these chips were made for low cost consumer apps, so that is a key seller.  They dropped that on Pi 2 and moved to an external buck converter but still powered from 5V0.  This converter is sensitive to xenon flashes - dig up Dave's video on this if interested - as it's just a flip-chip silicon device.

Navigation

[0] Message Index

[#] Next page

[*] Previous page

There was an error while thanking
Thanking...
Go to full version
Powered by SMFPacks Advanced Attachments Uploader Mod