Ultra Small Ethernet + RP2040 Board Production Record
WIZNET W5100S + Seeed Studio XIAO-RP2040
Summary
I have done a lot of projects related to RP2040. We always used the Pico board to proceed. I used a lot of W5100S-EVB-Pico, an Ethernet-enabled board in Pico. Now, I want to make a smaller and more efficient board than this board and proceed with the project.
The XIAO board is the smallest configuration based on various MCUs. It's made very small like the image.
W5100S is a TCP/IP Ethernet chip.The W5100S helps the MCU communicate easily via SPI.
Schematics design start
The biggest advantage of the XIAO-RP2040 board is that it is compact, so the W5100S-XIAO board was also made compact. As a result, the length and impedance matching of the differential pair line had no choice but to give up.(But I got it right to some extent. As much as I can)
I was disappointed because it looked bigger than I thought when I saw the completion of 3D... Next time, we should consider replacing the RJ-45 with the SMD type and placing the W5100S on the bottom surface. First of all, I decided to proceed like this..
PCB ordering
After finishing the work, I placed an order at Seed Studio.
I could finish ordering the board very easily. It seems that Seed Studio takes care of minor problems when ordering. I was able to do it comfortably.
PCB assembly
I wanted to make it work, so I finished assembling it quickly. When I put it together, I felt it was much smaller than I thought. (I didn't take the picture well even when I saw it.)
It fits perfectly when fitted. I like it because it's very compact. The Ethernet test is done with Loopback, and it works well.
Next
Next time, I will proceed with an interesting project through this board and post it.
Schematics