7 ms·
Some specs here: https://www.digikey.ca/en/product-highlight/r/raspberry-pi/raspberry-pi-sc1631-pico-2 https://www.digikey.ca/en/product-highlight/r/raspberry-p
by blackkat 2y ago
Some specs here: https://www.digikey.ca/en/product-highlight/r/raspberry-pi/raspberry-pi-sc1631-pico-2 https://www.digikey.ca/en/product-highlight/r/raspberry-pi/r...
Based on the RP2350, designed by Raspberry Pi in the United Kingdom
Dual Arm M33s at 150 MHz with FPU
520 KiB of SRAM
Robust security features (signed boot, OTP, SHA-256, TRNG, glitch detectors and Arm TrustZone for Cortex®-M)
Optional, dual RISC-V Hazard3 CPUs at 150 MHz
Low-power operation
PIO v2 with 3 × programmable I/O co-processors (12 × programmable I/O state machines) for custom peripheral support
Support for PSRAM, faster off-chip XIP QSPI Flash interface
4 MB on-board QSPI Flash storage
5 V tolerant GPIOs
Open source C/C++ SDK, MicroPython support
Software-compatible with Pico 1/RP2040
Drag-and-drop programming using mass storage over USB
Castellated module allows soldering directly to carrier boards
Footprint- and pin-compatible with Pico 1 (21 mm × 51 mm form factor)
26 multifunction GPIO pins, including three analog inputs
Operating temperature: -20°C to +85°C
Supported input voltage: 1.8 VDC to 5.5 VDC
- synergy20 2y agoWow, can't wait. Love the 5V GPIO and security features.
- Daneel_ 2y ago5V GPIO is a huge deal for me - this immediately opens up a huge range of integrations without having to worry about line level conversion. I can’t wait to use this!
- azinman2 2y agoDoes tolerant mean ok to do? Or it just won’t fry your chip but you should actually run at 3.3?
- tredre3 2y agoIt usually means it's clamped so it might result in a small amount of wasted energy/heat but no damage. So yes it means it's okay but if you can you should go for 3.3.
- murderfs 2y ago5V tolerant means that it'll accept 5V input (and correctly interpret it as high), but output will still be 3.3V.
- HeyLaughingBoy 2y agoBe careful with assumptions though. Being 5V tolerant doesn't mean that your 3V output can sufficiently drive an input that expects 0-5V levels correctly. I ran into this problem using an ESP32 to drive a Broadcom 5V LED dot-matrix display. On paper everything looked fine; in reality it was unreliable until I inserted an LS245 between the ESP and the display.
- lloydatkinson 2y ago> LS245 Do you think that would be a good IC to drive these with a RP2040? https://www.analog.com/en/products/max7219.html https://www.analog.com/en/products/max7219.html
- HeyLaughingBoy 2y agoA better question might be why anyone is using a MAX7219 on a new design in 2024. There are so many other choices for displays than a 20 year-old IC from a company that's gone through two changes of ownership since. Anyway, a 74LS245 isn't a level shifter, it's an octal buffer. It just happened to be the right choice for my needs. In your application, I'd suggest an actual level shifter. You can find level shift breakout boards at Sparkfun and Adafruit.
- irdc 2y ago> Being 5V tolerant doesn't mean that your 3V output can sufficiently drive an input that expects 0-5V levels correctly. It's fine for TTL (like your 74LS245 is), which registers voltages as low as 2V as a logical 1. Being able to directly interface with TTL eases up so many retrocomputing applications.
- HeyLaughingBoy 2y agoWhich was... exactly the reason I chose it?
- my123 2y agoHazard3 RTL: https://github.com/Wren6991/Hazard3 https://github.com/Wren6991/Hazard3
- IshKebab 2y agoI wonder how well it's been verified.
- pclmulqdq 2y agoThis is a really big deal. Verifying a core is hard, and if the repo doesn't come with a testbench, I'm very suspicious.
- IshKebab 2y agoEven if it does I'm suspicious. The open source RISC-V verification systems are not very good at the moment: * riscv-arch-tests: ok, but a very low bar. They don't even test combinations of instructions so no hazards etc. * riscv-test: decent but they're hand-written directed tests so they aren't going to get great coverage * TestRig: this is better - random instructions directly compared against the Sail model, but it's still fairly basic - the instructions are completely random so you're unlikely to cover lots of things. Also it requires some setup so they may not have ran it. The commercial options are much better but I doubt they paid for them.
- my123 2y agoSee https://github.com/Wren6991/Hazard3/tree/stable/test https://github.com/Wren6991/Hazard3/tree/stable/test for the test harnesses used. I wonder if they did release all they used there.
- moffkalast 2y ago> Low-power operation Low power suspend? In a Pi Foundation product? Impossible.
- thomasdeleeuw 2y agoNot sure why this is downvoted but the sleep and dormant pico examples have quite some issues, they are still in "extras" and not in "core", so while documentation of features is my personal favorite aspect of the pico, there is room for improvement here still.
- tssva 2y agoIt is downvoted because it is a low effort sarcastic comment which provides no real contribution to the discussion. Your comment actually provides real feedback as to where there are currently issues.
- coder543 2y agoI'm having trouble seeing where the datasheet actually says the GPIO pins are 5V tolerant. EDIT: okay, section 14.8.2.1 mentions two types of digital pins: "Standard Digital" and "Fault Tolerant Digital", and the FT Digital pins might be 5V tolerant, it looks like.
- sowbug 2y agoPage 13: "GPIOs are 5 V-tolerant (powered), and 3.3 V-failsafe (unpowered)"
- coder543 2y agoYep, I edited a few minutes ago to mention a reference I found in the datasheet. It's cool, but the reality seems a little more nuanced than that quote would indicate, since that only appears to work for GPIO-only pins, not just pins being used as GPIO. (So, if a pin supports analog input, for example, it will not be 5V tolerant.)
- jayyhu 2y agoEdit: See comment below; The RP2350 can be powered by a 5V supply.
- giantg2 2y agoI'd rather have it run on the lower voltage - generally easier to step down than buck up. Either way, the modules are pretty cheap, small, and easy to find.
- skykooler 2y agoHow much tolerance does that have - can it run directly off a 3.7v lithium ion battery?
- deleted 2y ago[deleted]
- jayyhu 2y agoYep, they explicitly call out that the onboard voltage regulator can work with a single lithium ion cell.
- dvdkon 2y agoThe regulator can take that, but as far as I can see it's only for DVDD, the core voltage of 1.1 V. You also need at least IOVDD, which should be between 1.8 V and 3.3 V. So you'll need to supply some lower voltage externally anyway. I suppose the main draw of the regulator is that the DVDD rail will consume the most power. 1.1 V is also much more exotic than 3.3 V.
- Findecanor 2y agoTo clarify: You can connect a 5V power source by connecting it to the VSYS pin which leads into the on-board voltage regulator. But the µC itself runs on 3.3V and is not totally 5V-capable. You'd need level converters to interface with 5V.
- 2y ago