30 Jul
2025
30 Jul
'25
12:30 p.m.
That's interesting. I have been using the RP2350 for a while now but I missed that
detail.
For what I do, I've found that just a voltage divider works fine for 3 volt tolerant
inputs with 5 volt drive. And 5 volt TTL seems to be happy with the 3 volt logic high
that the Pico chips produce. So while voltage shifters are well known I haven't found
the need for them.
Still this is handy to know.
The RP2350 is quite an amazing chip for very little money. A dollar or two more than the
RP2040, which itself is already highly capable. By the way, there is a very nice FORTH
system for these called Zeptoforth; I've been doing a bunch of work with that.
paul
On Jul 30, 2025, at 10:04 AM, Martin Bishop via cctalk
<cctalk(a)classiccmp.org> wrote:
https://www.raspberrypi.com/products/rp2350/
From postings, I know that folks use the RP2350 for interfacing; the trade press has been
shipping news of RP's rev A4 datasheet in volume.
The datasheet should tell all. However, the 5V tollerance of the "IO" pins is
significant for its simplification of TTL interfacing; the maximum supply and output
voltage remains 3v3. See section 14.8.2 (p 1335) et seq - NB the FT indication.
Martin