RP2350 GPIO Pull-down Latching Bug

I just saw this bug while searching the web. I haven't been able to get a Pico 2 so I bought a Seeed Xiao RP2350 board which I just received yesterday. Maybe it's a good thing that these boards have not been more available...

Here is the errata excerpt from the rp2350 datasheet

At least this bug is documented. I haven't powered my board yet so I have not had a chance to encounter the problem.

Here is a link to a post on Hackster - Hardware Bug in RP2350 leads to unexpected pull-down behavior.

michaelkellett over 1 year ago in reply to scottiebabe

It would be interesting to know how that changes with temperature - parasitic and accidental effects are often badly behaved.

MK
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phoenixcomm over 1 year ago in reply to Jan Cumps

Jan Cumps This isn't a 'fix' its im blind and anybody that bought the piece of crap lost money time, and investment! fixing the Docs will not fix the underling issue! the silicon and or their firmware is Bogged Up!

What they should do: is to give anybody that has one to replace it. Its called a RECALL!! ~~ Cris

or Simpler Stop using Pis!!!
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phoenixcomm over 1 year ago in reply to michaelkellett

michaelkellett Give one to the gods! hook it up and toss it in the fire!! or if you must on top of the stove. ~~ Cris
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shabaz over 1 year ago in reply to phoenixcomm

I bought a few but have not spent any time with them so far. I might one day make use of them, but on the whole I'm going to use the older Pico instead. For sure the new chip will be very useful for those that buy knowing the issue exists and work around it.

The bug is severe enough that I would hope that any of the reputable sellers would immediately refund anyone who wants a refund, if they purchased unaware of the issue. (And if they don't I hope people report them to trading standards or equivalent in other countries; users deserve to be dealt with fairly). I hope they now it make clear when purchasing, that there is an issue with the chip, so that users are aware that they may wish to buy an older Pico model instead.
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scottiebabe over 1 year ago in reply to phoenixcomm

Easy there, TTL flew to the moon.
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kmikemoo over 1 year ago

Thanks ralphjy for posting this. It came up in conversation last night and I actually knew what was going on.
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michaelkellett over 1 year ago in reply to phoenixcomm

I think we might be saying the same thing but in different words.

My point is that if you have a duff IO circuit then drawing a graph of it in an Errata sheet in one set of circumstances is not fixing it. So unless the Pi people can put limits on their graph over the working range of the device it doesn't really add a whole lot.

MK
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DAB over 1 year ago

It is issues like these that keep me being a late adopter of new technology.

I get really pissed when I find I have to debug somebody else's products.
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Jan Cumps over 1 year ago in reply to scottiebabe

... on the smell of an oily rag
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scottiebabe over 1 year ago in reply to Jan Cumps

Experimenting with the low power and sleep features of the rp2350 is on my todo list...
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