HardLabs

Wifi interposer

dsi-modchip·pcb·wifi-interposer/wifi-interposer.kicad_pcb

Wifi interposer PCB layout, top view — open source RP2040/RP2350 board by dsi-modchip
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About the Wifi interposer PCB

Wifi interposer is an open source RP2040/RP2350 PCB design by dsi-modchip, published on GitHub under the CERN-OHL-S-2.0 license. It is a 4-layer board measuring 51.3 × 21 mm, with 51 components from 26 distinct parts.

Its main chip is the RP2040, from the RP2040/RP2350 family. Other key parts include the W25Q16JVUXIQ, D1213A-02SM, MIC5317-1.8YD5, AP2127K-3.3 and USBLC6-2SC6. By type, the board carries 20 capacitors, 13 resistors, 8 ICs, 4 connectors, 2 switches and 1 transistor.

It belongs with the iot & wireless designs in this gallery.

From the project

This repository contains the KiCAD design files for the DSi modchip and the cable flex-PCB.

This repository contains the KiCAD design files for the DSi modchip and the cable flex-PCB.

Currently, you'll have to order and make these yourself. I don't think making them widely available already is a good idea, there's still a few bugs left in the design.

The issues with the modchip PCB itself are listed here. Additionally, inserting a cable into the modchips USB socket too forcefully can cause the modchip PCB to snap in half, which is bad.

Main components on the Wifi interposer

RP2040W25Q16JVUXIQD1213A-02SMMIC5317-1.8YD5AP2127K-3.3USBLC6-2SC6PCA9306DC1

Wifi interposer bill of materials (BOM)

51 components, 26 distinct parts.

QtyPartRefs
1
RP2040
U1
2
W25Q16JVUXIQ
U2, U4
1
D1213A-02SM
U3
1
MIC5317-1.8YD5
U5
1
AP2127K-3.3
U6
1
USBLC6-2SC6
U7
1
PCA9306DC1
U8
1
Q_Dual_NPMOS_S1G1D2S2G2D1
Q4
1
12.000MHz
Y2
1
TWL_WifiConn_Plug_TO_MAINBRD
J1
1
TWL_WifiConn_Rcpt_TO_WIFIBRD
J2
1
USB_C_Receptacle_USB2.0
J3
1
GlitchFPC
J5
1
0.5A
F1
2
SW_Push
SW1, SW2
1
WS2812B
D1
6
1uF
C1, C2, C8, C9, C18, C19
2
27pF
C3, C4
12
100nF
C5, C6, C7, C10, C11, C12, C13, C14 +4
2
10k
R1, R2
Show 6 more
QtyPartRefs
3
47k
R3, R5, R11
1
200k
R4
2
5.1k
R6, R12
2
1k
R7, R8
2
27 1%
R9, R10
1
330
R13

Wifi interposer design files

The KiCad project lives in the dsi-modchip/pcb repository on GitHub; these links point at the commit this page was built from.

Wifi interposer: common questions

What microcontroller does the Wifi interposer use?

The Wifi interposer is built around the RP2040, from the RP2040/RP2350 family.

How big is the Wifi interposer PCB?

The Wifi interposer measures 51.3 × 21 mm, has 4 copper layers and is 0.799999 mm thick.

How many components are on the Wifi interposer?

51 components, from 26 distinct parts. The full bill of materials is listed on this page.

Where can I download the Wifi interposer design files?

From the dsi-modchip/pcb repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the Wifi interposer design in my own project?

Yes, under the terms of its CERN-OHL-S-2.0 license, which dsi-modchip chose for the repository.

Can I test firmware for the Wifi interposer without the hardware?

Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug RP2040/RP2350 firmware against it before you order a PCB.

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