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Input Module for Thinkpad X1 Carbon Gen 10 keyboard

image image

This module is based on the "Microcontroller Input Module" example from https://github.com/FrameworkComputer/InputModules which in turn is based on the Adafruit Feather RP2040 (https://www.adafruit.com/product/4884).

More discussion of this project, and of replacement keyboards for the Framework 16 laptop generally, can be found in the Framework forums.

License

Input Modules © 2023 by Framework Computer Inc is licensed under CC BY 4.0.

This module for the Thinkpad X1 Carbon Gen 10 keyboard is © 2024 by C. Scott Ananian and is also licensed under CC BY 4.0.

To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/

Fabrication and Assembly

A 0.8mm PCB is recommended.

All components are SMT on the bottom side of the board.

To enter boot mode on the RP2040 to reflash, hold down the "Fn" key on the keyboard as power is applied.

BOM

You can find alternatives for just about each of these components except for the microcontroller. The keyboard FPC is designed to be inserted with contacts facing down toward the PCB, which is "up" (since the connector is on the bottom side of the board) and thus will require folding the keyboard's FPC cable to achieve the proper orientation.

Notes: 1uF caps are 2.2uF in pico reference design and it had one more 100nF cap on 1v1; match crystal caps to crystal selected.

Item # Designator Qty Manufacturer Mfg Part # Description / Value Package/Footprint Type
1 C1, C4, C6, C9, C11, C12, C13, C14, C15, C16, C17, C18, C20 13 Samsung CL05B104KO5NNNC 100nF Capacitor_SMD:C_0402_1005Metric SMT
2 C2, C3 2 Murata GRM1555C1H150JA01D 15pF Capacitor_SMD:C_0402_1005Metric SMT
3 C5, C8, C19, C21, C22, C23 6 TDK C1608X5R1A106M080AC 10uF Capacitor_SMD:C_0603_1608Metric SMT
4 C7, C10 2 Samsung CL05A105KO5NNNC 1uF Capacitor_SMD:C_0402_1005Metric SMT
5 D1, D2, D3, D4, D5 5 Littelfuse SP0402B-ULC-01ETG D_TVS Diode_SMD:D_0402_1005Metric SMT
6 H1, H2 2 Keystone 24929 24929 InputModule:MountingHole_3.7mm_Pad_24929 SMT
7 J2 1 HDGC 0.3K-HX-45PWB 45-pin FPC connector 20655-045E-01:0.3K-HX-45PWB SMT
8 R1, R3 2 Yageo RC0402FR-071KL 1k Resistor_SMD:R_0402_1005Metric SMT
9 R2 1 Yageo RC0402FR-07330KL 330k Resistor_SMD:R_0402_1005Metric SMT
10 R4, R5 2 Panasonic ERJ-2RKF27R0X 27 Resistor_SMD:R_0402_1005Metric SMT
11 R6, R7, R8, R9 4 Panasonic ERJ-2RKF1000X 100 Resistor_SMD:R_0402_1005Metric SMT
12 U1 1 Winbond W25Q16JVUXIQ W25Q16JVUXIQ InputModule:SON-8-1EP_3x2mm_P0.5mm_EP0.2x1.6mm SMT
13 U2 1 Raspberry Pi RP2040TR7 RP2040 Package_DFN_QFN:QFN-56-1EP_7x7mm_P0.4mm_EP3.2x3.2mm SMT
14 U3 1 Microchip MCP23S17_ML MCP23S17_ML Package_DFN_QFN:QFN-28-1EP_6x6mm_P0.65mm_EP4.25x4.25mm SMT
15 Y1 1 Abracon ABM8G-12.000MHZ-18-D2Y-T 12.000MHz Crystal:Crystal_SMD_3225-4Pin_3.2x2.5mm SMT