You *can* have analogue circuitry on 40nm LP - it's just not a purpose-designed process so everything has to be a) CMOS b) sub-optimally sized.mahjongg wrote: Or what about >3MHz speeds for Video?
In any case the current silicon process used for the SoC probably doesn't support analog circuitry (except perhaps for some switching supply logic, The previous PI's used an voltage controlled supply for the core, but probably that is done with digital logic too, just a few stronger digital transistors). Real analog logic usually means using a different fabrication process. The PI's SoC is not built using a silicon process, like an ATMega is designed with.
pspeth wrote: ↑Fri Sep 28, 2018 3:11 pmI didn't find anything specifically on this but I would love to see 2 or 4 Analog to Digital inputs on a future pi.
This would streamline interfacing with a huge number of existing sensors out there.
This could even be shipped without the pin headers. Keeping the basic form the same for existing products.
It could also be shipped as a 5 dollar extra version of the pi.
Isn't that a crib of what Lincoln is reputed to have said? https://historynewsnetwork.org/article/161924fruitoftheloom wrote: ↑Fri Oct 19, 2018 9:57 amhttps://www.goodreads.com/quotes/699462 ... all-of-the
Going by this logic, I neither need nor want POE, yet if I want a Pi3b+, I must accept it.W. H. Heydt wrote: ↑Fri Sep 28, 2018 3:51 pmNot a bad suggestion. My concerns are that the SoC may not have the needed inputs (which would, in turn mean adding the feature to future SoCs--very expensive--or adding an ADC to the board--where?), something else would have to be removed to make space for the pins, even if not populated, and the ever popular--how many people actual need this (the answer *may* be "lots"), because this would add cost for everyone when not everyone needs or wants it.
As it is, you can always add ADCs through the use of HATs or external circuitry.
Not at all. You have to accept the POE connector, but the expensive POE stuff is on a separate, optional board. Likewise (excluding the Pi0 and Pi0W) we all have to accept the GPIO connector, but no-one has to add an unwanted HAT.Imperf3kt wrote: ↑Sun Oct 21, 2018 9:38 pmGoing by this logic, I neither need nor want POE, yet if I want a Pi3b+, I must accept it.
Overall, it benefits more people who can afford those expensive POE routers, so it was added.
Analogue input is a commonly requested feature I see here, the request to have it on the board itself isn't as outlandish as asking for octacore CPUs with 4GB of RAM
As a pure curiosity, and not a suggestion on what to add into future things, you can have ADCs on 16nm CMOS, with quite bizarre performance to boot.
This sounds like a great way to fry your Pi.
The existence of analog I/O is one of the reasons people have recommended Arduinos as supplemental boards to use with Pis for years.