4 layers63.5 × 26.2 mm
PiggybackBT 1 0
NCKiser/Piggyback
Piggyback is a 32u4-MU carrier board that fitw between keyswitches on keyboard PCBs
49 parts1
2 layers55.6 × 22.2 mm
Piggyback 3 0
NCKiser/Piggyback1Piggyback is a 32u4-MU carrier board that fitw between keyswitches on keyboard PCBs
- Size
- 55.6 × 22.2 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 60
- Nets
- 92
- Pads
- 287
- Tracks, vias
- 47, 3
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 7 (file 20221018)
- Created
- 20 Oct 2021
- Updated
- 27 Apr 2023
Overview
Piggyback 3 0 is an open-source printed circuit board by NCKiser, from the NCKiser/Piggyback repository on GitHub. It is a 2-layer board of 55.6 × 22.2 mm with 60 parts on 92 nets, routed with 47 tracks and 3 vias.
It is built around the W25Q128JVSIQ, SN74LVC1T45DBV and SRV05-4. Its parts include 15 switches, 14 capacitors, 11 resistors, 5 ICs and 3 diodes. It belongs with the RP2040 boards of this library.
Main components
3
W25Q128JVSIQ
SOIC-8-208mil-40℃~+85℃ 100,000 cycles 120ms@(32KB) 128Mbit 133MHz 1uA 2.7V~3.6V 20 Years 3ms Power-on reset、Hardware write protection、Software write protection、Write enable latch、Absolute write protection SPI SOIC-8-208mil NOR FLASH ROHSWinbondNOR FLASH
SN74LVC1T45DBV
SOT-23-6-40℃~+85℃ 1 1 1.65V~5.5V 1.65V~5.5V 420Mbps Bidirectional Tri-State SOT-23-6 Translators, Level Shifters ROHSTexas InstrumentsTranslators, Level ShiftersSRV05-4
SOT-23-6L-55℃~+150℃ 15V 1pF 4A 5V 5uA 6V 80W ESD Four channels IEC 61000-4-2、IEC 61000-4-5 Unidirectional SOT-23-6L ESD and Surge Protection (TVS/ESD) ROHShongjiachengESD And Surge Protection (TVS/ESD)
README
Readme.mdPiggyback is a small circuit board that carries an Atmega-32u4-MU microprocessor and all of the supporting components needed for it to run. The only thing you need to provide is 5V power and ground.
Piggyback has 4 legs, each with 8 castellated holes spaced 0.1in (2.54mm) apart. These legs break out all of the GPIO, power, and USB Data pins. Each leg roughly corresponds to a port of the 32u4's IO.
Piggyback was designed with custom mechanical keyboard PCBs in mind. The board fits snuggly under a row of MX or Alps style switches spaced 0.75in (19.05mm) apart. The legs fit within the space between the switch footprints.
Piggyback features ESD protection on the USB data lines, as well as a 500mA resettable polyfuse on the 5V line.
To use the Piggyback in your PCB designs, (load and place the symbol and footprint in your schematic and PCB), and wire it up to your USB port and key matrix. If you are using a USB-C connector, you will need to take care of the CC pins on your own (usually with 5.1k resistors to ground).
This is open-source, as long as you give credit, and is free for commercial use. You can make, modify, and sell this board as you please, as long as you do not claim to own the copyright.
Parts
60| Qty | Value | Footprint | References |
|---|---|---|---|
| 15 | MX_SW_solder | marbastlib-mx:SW_MX_1u | SW1, SW2, SW3, SW4, SW5, SW6, SW7, SW8, SW9, SW10, SW11, SW12, SW13, SW14, SW15 |
| 7 | 100n | Capacitor_SMD:C_0402_1005Metric | C7, C8, C9, C10, C11, C12, C16 |
| 4 | 10k | Resistor_SMD:R_0402_1005Metric | R1, R2, R7, R9 |
| 4 | 1u | Capacitor_SMD:C_0402_1005Metric | C1, C2, C3, C5 |
| 3 | 10u | Capacitor_SMD:C_0402_1005Metric | C4, C6, C13 |
| 3 | 51k | Resistor_SMD:R_0402_1005Metric | R11, R12, R13 |
| 3 | D_Small | Diode_SMD:D_SOD-123 | D1, D2, D3 |
| 2 | 1k | Resistor_SMD:R_0402_1005Metric | R6, R10 |
| 2 | 27 | Resistor_SMD:R_0402_1005Metric | R4, R5 |
| 2 | Conn_01x06_Female | Connector_PinHeader_2.54mm:PinHeader_1x06_P2.54mm_Vertical | J1, J5 |
| 2 | EMH3 | Package_TO_SOT_SMD:SOT-563 | Q1, Q2 |
| 2 | LOGO | LOGO | G***, G*** |
| 1 | 500mA | Fuse:Fuse_1206_3216Metric | F1 |
| 1 | 78171-0004 | locallib:PicoEZMate-Reinforced-Lite | EZ1 |
| 1 | Conn_01x01_Socket | Connector_PinSocket_2.54mm:PinSocket_1x01_P2.54mm_Vertical | RGB1 |
| 1 | Conn_01x23_Female | Connector_PinHeader_2.54mm:PinHeader_1x22_P2.54mm_Vertical | J2 |
| 1 | Crystal_GND2_Small | Crystal:Resonator_SMD_Murata_CSTxExxV-3Pin_3.0x1.1mm | Y2 |
| 1 | RP2040TR7 | SnapEDA Library:QFN40P700X700X90-57N | U1 |
| 1 | SN74LVC1T45DBV | Package_TO_SOT_SMD:SOT-23-6 | U5 |
| 1 | SRV05-4 | marbastlib-various:SOT-23-6-routable | U3 |
| 1 | SW_SPST | Button_Switch_SMD:SW_Push_SPST_NO_Alps_SKRK | SWR1 |
| 1 | W25Q128JVS | Package_SO:SOIC-8_5.23x5.23mm_P1.27mm | U4 |
| 1 | XC6206PxxxMR | Package_TO_SOT_SMD:SOT-23 | U2 |
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Questions
How big is the Piggyback 3 0 PCB?
It measures 55.6 × 22.2 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Piggyback 3 0 use?
60 parts, built around the W25Q128JVSIQ, SN74LVC1T45DBV and SRV05-4. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
Where can I download the Piggyback 3 0 KiCad files?
From the NCKiser/Piggyback repository on GitHub, at the commit this page was made from: the board is Piggyback_3_0/Piggyback_3_0.kicad_pcb and its schematic PiggybackBT_1_0/PiggybackBT_1_0.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Piggyback 3 0 design in my own project?
Its repository states no licence, so its author keeps all rights: ask NCKiser before reusing the design.