RP2350B 64 Pin development board

Author	Message
Volhout Guru Joined: 05/03/2018 Location: Netherlands Posts: 5994	Posted: 05:52pm 24 Aug 2024         robert.rozee said     Mixtel90 said   It's quite feasible to make a breadboard friendly version of the RP2350B, but it's seriously ungainly and fragile with all those pins (a minimum of 64) the 80-pin package only has 48 GPIO pins, including the 8 that have alternative functions as ADC inputs. plus you would want 3v3, ground, RESET, and for fun lets also include DP and DM (the two USB signals). also an onboard LDO regulator capable of handing up to 12 supply would be handy - rounding it out to an even 52 pins in total. onboard it would make sense to have the SPI flash, a USB socket for uploading the firmware (this necessitates a regulator capable of taking the 5v USB supply down to 3v3). and why not also an HDMI socket and header to plug in one of those little microSD socket daughterboards? if we subtract out the 8 GPIO pins for HDMI, and the 4 GPIO pins that we will use for the SD card interface (via a 6-pin header), that takes our 52 back down to... just 40 pins. this is no more than the existing pico PCB, a decidedly non-fragile number. and to accommodate the width of the HDMI socket, we can widen the PCB by an extra 0.2". cheers, rob   :-) Don’t forget the crystal….. Volhout