Backup
About the Backup PCB
Backup is an open source Nordic nRF PCB design by kitsunekeyboards, published on GitHub under the MIT license. It is a 2-layer board measuring 285 × 94.6 mm, with 143 components from 78 distinct parts.
Its main chip is the MDBT40, from the Nordic nRF family. Other key parts include the ATMEGA32U4, MCP73831T-2ATI/OT, SPX3819-3.3 and USBLC6-2SC6. By type, the board carries 49 diodes, 48 switches, 13 resistors, 8 capacitors, 5 ICs and 4 inductors.
It belongs with the keyboards designs in this gallery.
From the project
Home of the Shapeshifter 4060 keyboard
Main components on the Backup
Backup bill of materials (BOM)
143 components, 78 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | ATMEGA32U4 | TQFP-44_10x10mm_P0.8mm | IC1 |
| 1 | MCP73831T-2ATI/OT | SOT23-5 | U1 |
| 1 | SPX3819-3.3 | SOT23-5 | U2 |
| 1 | MDBT40 | BLE_MODULE_RAYTAC_MDBT40 | U3 |
| 1 | USBLC6-2SC6 | USBLC6-2SC6 | U6 |
| 2 | JSTPH | JSTPH2-with-THT | X1, X2 |
| 1 | 8MHz | RESONATOR-SMD | Y1 |
| 1 | HRO-TYPE-C-31-M-12 | HRO-TYPE-C-31-M-12 | J1 |
| 1 | ISP | isp_standard | J2 |
| 1 | Polyfuse | Fuse_SMD1206_Reflow | F1 |
| 3 | PINHD-1X1CB | 1X01-CLEANBIG | JP1, JP2, JP3 |
| 1 | TAB | Hybrid_Kailh_MX_Socket_No_Alignment_Pad | SW1 |
| 1 | Q | Hybrid_Kailh_MX_Socket_Through_Hole_No_Alignment_Pad | SW2 |
| 1 | W | Hybrid_Kailh_MX_Socket_Through_Hole_No_Alignment_Pad | SW3 |
| 1 | E | Hybrid_Kailh_MX_Socket_Through_Hole_No_Alignment_Pad | SW4 |
| 1 | R | Hybrid_Kailh_MX_Socket_Through_Hole_No_Alignment_Pad | SW5 |
| 1 | T | Hybrid_Kailh_MX_Socket_Through_Hole_No_Alignment_Pad | SW6 |
| 1 | Y | Hybrid_Kailh_MX_Socket_Through_Hole_No_Alignment_Pad | SW7 |
| 1 | U | Hybrid_Kailh_MX_Socket_Through_Hole_No_Alignment_Pad | SW8 |
| 1 | I | Hybrid_Kailh_MX_Socket_Through_Hole_No_Alignment_Pad | SW9 |
Show 58 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | O | Hybrid_Kailh_MX_Socket_Through_Hole_No_Alignment_Pad | SW10 |
| 1 | P | Hybrid_Kailh_MX_Socket_Through_Hole_No_Alignment_Pad | SW11 |
| 1 | BKSP | Hybrid_Kailh_MX_Socket_Through_Hole_No_Alignment_Pad | SW12 |
| 1 | ESC | Hybrid_Kailh_MX_Socket_Through_Hole_No_Alignment_Pad | SW13 |
| 1 | A | Hybrid_Kailh_MX_Socket_Through_Hole_No_Alignment_Pad | SW14 |
| 1 | S | Hybrid_Kailh_MX_Socket_Through_Hole_No_Alignment_Pad | SW15 |
| 1 | D | Hybrid_Kailh_MX_Socket_Through_Hole_No_Alignment_Pad | SW16 |
| 1 | F/LOWER | Hybrid_Kailh_MX_Socket_Through_Hole_No_Alignment_Pad | SW17 |
| 1 | G | Hybrid_Kailh_MX_Socket_Through_Hole_No_Alignment_Pad | SW18 |
| 1 | H | Hybrid_Kailh_MX_Socket_Through_Hole_No_Alignment_Pad | SW19 |
| 1 | J/RAISE | Hybrid_Kailh_MX_Socket_Through_Hole_No_Alignment_Pad | SW20 |
| 1 | K | Hybrid_Kailh_MX_Socket_Through_Hole_No_Alignment_Pad | SW21 |
| 1 | L | Hybrid_Kailh_MX_Socket_Through_Hole_No_Alignment_Pad | SW22 |
| 1 | ; | Hybrid_Kailh_MX_Socket_Through_Hole_No_Alignment_Pad | SW23 |
| 1 | " | Hybrid_Kailh_MX_Socket_Through_Hole_No_Alignment_Pad | SW24 |
| 2 | SHIFT | Hybrid_Kailh_MX_Socket_Through_Hole_No_Alignment_Pad | SW25, SW41 |
| 1 | Z | Hybrid_Kailh_MX_Socket_Through_Hole_No_Alignment_Pad | SW26 |
| 1 | X | Hybrid_Kailh_MX_Socket_Through_Hole_No_Alignment_Pad | SW27 |
| 1 | C | Hybrid_Kailh_MX_Socket_Through_Hole_No_Alignment_Pad | SW28 |
| 1 | V | Hybrid_Kailh_MX_Socket_Through_Hole_No_Alignment_Pad | SW29 |
| 1 | B | Hybrid_Kailh_MX_Socket_Through_Hole_No_Alignment_Pad | SW30 |
| 1 | N | Hybrid_Kailh_MX_Socket_Through_Hole_No_Alignment_Pad | SW31 |
| 1 | M | Hybrid_Kailh_MX_Socket_Through_Hole_No_Alignment_Pad | SW32 |
| 1 | , | Hybrid_Kailh_MX_Socket_Through_Hole_No_Alignment_Pad | SW33 |
| 1 | . | Hybrid_Kailh_MX_Socket_Through_Hole_No_Alignment_Pad | SW34 |
| 1 | / | Hybrid_Kailh_MX_Socket_Through_Hole_No_Alignment_Pad | SW35 |
| 1 | ENTER | Hybrid_Kailh_MX_Socket_Through_Hole_No_Alignment_Pad | SW36 |
| 1 | HYPER | Hybrid_Kailh_MX_Socket_Through_Hole_No_Alignment_Pad | SW37 |
| 1 | CTRL/GRV | Hybrid_Kailh_MX_Socket_Through_Hole_No_Alignment_Pad | SW38 |
| 1 | ALT/TAB | Hybrid_Kailh_MX_Socket_Through_Hole_No_Alignment_Pad | SW39 |
| 1 | CMD | Hybrid_Kailh_MX_Socket_Through_Hole_No_Alignment_Pad | SW40 |
| 1 | BKSP/LIFT | Hybrid_Kailh_MX_Socket_Through_Hole_No_Alignment_Pad | SW42 |
| 1 | ENTER/LIFT | Hybrid_Kailh_MX_Socket_Through_Hole_No_Alignment_Pad | SW43 |
| 1 | SPACE | Hybrid_Kailh_MX_Socket_Through_Hole_No_Alignment_Pad | SW44 |
| 1 | LEFT | Hybrid_Kailh_MX_Socket_Through_Hole_No_Alignment_Pad | SW45 |
| 1 | DOWN | Hybrid_Kailh_MX_Socket_Through_Hole_No_Alignment_Pad | SW46 |
| 1 | UP | Hybrid_Kailh_MX_Socket_Through_Hole_No_Alignment_Pad | SW47 |
| 1 | RIGHT | Hybrid_Kailh_MX_Socket_Through_Hole_No_Alignment_Pad | SW48 |
| 2 | SW_SPDT | EG1218 | SW_POW_EN1, SW_POW_EN2 |
| 1 | SWITCH_PUSH | SW_SPST_B3U-1000P | SW_RESET1 |
| 1 | SWITCH_PUSH | Hybrid_Kailh_MX_Socket_Through_Hole_No_Alignment_Pad | SW_RESET2 |
| 1 | SWCLK | PAD-1.5X2.0 | TP1 |
| 2 | SWDIO | PAD-1.5X2.0 | TP2, TP3 |
| 48 | DIODE | Diode-dual | D1, D2, D3, D4, D5, D6, D7, D8 +40 |
| 1 | MBR120 | SOD-123 | D49 |
| 1 | YELLOW | CHIPLED_0805_NOOUTLINE | L1 |
| 1 | RED | CHIPLED_0805_NOOUTLINE | L2 |
| 1 | BLUE | CHIPLED_0805_NOOUTLINE | L3 |
| 1 | ORANGE | CHIPLED_0805_NOOUTLINE | L4 |
| 3 | 10µF | Capacitor-0805MP | C1, C3, C5 |
| 4 | 1µF | Capacitor-0805MP | C2, C4, C6, C7 |
| 1 | 100nF | Capacitor-0805MP | C20 |
| 2 | 1K | 0805-NO | R1, R10 |
| 3 | 100K | 0805-NO | R2, R4, R5 |
| 1 | 10K | 0805-NO | R3 |
| 3 | 2.2K | 0805-NO | R6, R7, R13 |
| 2 | 22 | 0805-NO | R8, R9 |
| 2 | 5.1K | 0805-NO | R11, R12 |
Backup design files
The KiCad project lives in the kitsunekeyboards/shapeshifter4060 repository on GitHub; these links point at the commit this page was built from.
Backup: common questions
What microcontroller does the Backup use?
The Backup is built around the MDBT40, from the Nordic nRF family.
How big is the Backup PCB?
The Backup measures 285 × 94.6 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the Backup?
143 components, from 78 distinct parts. The full bill of materials is listed on this page.
Where can I download the Backup design files?
From the kitsunekeyboards/shapeshifter4060 repository on GitHub, which has the KiCad layout; the links under Design files point to each one.
Can I use the Backup design in my own project?
Yes, under the terms of its MIT license, which kitsunekeyboards chose for the repository.
Can I test firmware for the Backup without the hardware?
Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug Nordic nRF firmware against it before you order a PCB.
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