2 layers302 × 93.1 mm
4 layers76.2 × 115.5 mm
Tfk21-avr
biosmanager/tfkA WIP collection of open-source high-end keyboard PCBs featuring hot-swap sockets, per-key and underglow RGB lighting, USB-C and overcurrent/overvoltage/ESD protection. Designed to be hand-solderable.
- Size
- 76.2 × 115.5 mm
- Copper layers
- 4
- Thickness
- 1.6 mm
- Parts
- 123
- Nets
- 107
- Pads
- 566
- Tracks, vias
- 1,464, 232
- Pours
- 3
- Routed
- Yes
- KiCad
- KiCad 5 (file 20171130)
- Created
- 16 Jan 2021
- Updated
- 25 Jul 2021
Overview
Tfk21-avr is an open-source printed circuit board by biosmanager, from the biosmanager/tfk repository on GitHub. It is a 4-layer board of 76.2 × 115.5 mm with 123 parts on 107 nets, routed with 1,464 tracks and 232 vias.
It is built around the ATMEGA32U4-AU, IS31FL3733B-TQLS4-TR and WS2812B, with the PRTR5V0U2X among its other parts. Its parts include 51 diodes, 23 capacitors, 13 resistors, 2 ICs and 2 connectors. It belongs with the keyboards and input and lEDs and displays boards and the AVR (ATmega, ATtiny) boards of this library.
Main components
4
ATMEGA32U4-AU
QFP-44(10x10)-40℃~+85℃ 10bit 16MHz 1KB 2.5KB 2.7V~5.5V 26 32KB 8 Bit AVR Built-in FLASH QFP-44(10x10) Microcontrollers (MCU/MPU/SOC) ROHSMicrochip TechnologyMicrocontrollers (MCU/MPU/SOC)
IS31FL3733B-TQLS4-TR
eTQFP-48(7x7)-40℃~+125℃ 1.05kHz~26.7kHz 16 2.7V~5.5V 46mA Analog、PWM Short Circuit Protection、LED open-circuit protection eTQFP-48(7x7) LED Drivers ROHSISSILED Drivers
WS2812B
5mm X 5mm Surface Mount RGB LED with Intelligent ControlWorldsemiUncategorised
PRTR5V0U2X
SOT-143-55℃~+125℃ 0.3pF、0.8pF 100W 10V、15V 5V 6.5V 6A 80nA ESD IEC 61000-4-2、IEC 61000-4-5、IEC 61000-4-4 Three channels Unidirectional SOT-143 ESD and Surge Protection (TVS/ESD) ROHSTECH PUBLICESD And Surge Protection (TVS/ESD)
README
tfk21-avr/README.mdtfk21-avr
21 key hot-swap RGB numpad with extra row on top. Uses Microchip ATmega32U4-AU microcontroller. All footprints should be suitable for hand soldering.
Parts
123| Qty | Value | Footprint | References |
|---|---|---|---|
| 21 | LED_RGBA | random-keyboard-parts:RGB-6028 | D31, D32, D33, D34, D35, D36, D37, D38, D39, D40, D41, D42, D43, D44, D45, D46 +5 |
| 21 | Switch diode | Diode_SMD:D_SOD-123 | D4, D10, D11, D12, D13, D14, D15, D16, D17, D18, D19, D20, D21, D22, D23, D24 +5 |
| 18 | MX-NoLED | Switch_Keyboard_Kailh:SW_Hotswap_Kailh_1.00u_NoFrontSilk | MX1, MX2, MX3, MX4, MX5, MX6, MX7, MX10, MX11, MX12, MX13, MX14, MX16, MX17, MX18, MX20 +2 |
| 9 | 100n | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C11, C12, C13, C14, C15, C16, C19, C21, C23 |
| 6 | WS2812B | LED_SMD:LED_WS2812B_PLCC4_5.0x5.0mm_P3.2mm | D25, D26, D27, D28, D29, D30 |
| 4 | 0.1u | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C1, C2, C3, C4 |
| 4 | 470n | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C17, C18, C20, C22 |
| 3 | MX-NoLED | Switch_Keyboard_Kailh:SW_Hotswap_Kailh_2.00u_NoFrontSilk | MX15, MX19, MX21 |
| 3 | MountingHole | MountingHole:MountingHole_2.5mm_Pad | H1, H3, H4 |
| 3 | Stabilizer | Mounting_Keyboard_Stabilizer:Stabilizer_Cherry_MX_2u_CrtYd | H5, H6, H7 |
| 2 | 100k | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R9, R12 |
| 2 | 10k | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R1, R7 |
| 2 | 1M | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R4, R8 |
| 2 | 22 | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R5, R6 |
| 2 | 22p | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C9, C10 |
| 2 | 2k | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R10, R11 |
| 2 | 4.7n | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C6, C8 |
| 2 | 5.1k | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R2, R3 |
| 1 | 10u | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C5 |
| 1 | 16MHz | Crystal:Crystal_SMD_3225-4Pin_3.2x2.5mm_HandSoldering | Y1 |
| 1 | 1u | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C7 |
| 1 | 20k | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R13 |
| 1 | 500mA | Fuse:Fuse_1206_3216Metric_Pad1.42x1.75mm_HandSolder | F1 |
| 1 | 6V | Diode_SMD:D_SOD-123 | D1 |
| 1 | ATmega32U4-AU | Package_QFP:TQFP-44_10x10mm_P0.8mm | U1 |
| 1 | AVR-ISP-6 | random-keyboard-parts:Reset_Pretty-Mask | J2 |
| 1 | Case | MountingHole:MountingHole_2.5mm_Pad | H2 |
| 1 | Case ESD | Diode_SMD:D_SOD-123 | D3 |
| 1 | IS31FL3733B-TQLS4-TR | Package_QFP:TQFP-48-1EP_7x7mm_P0.5mm_EP5x5mm_ThermalVias | U2 |
| 1 | LOGO | biosmanager:biosmanager_pcb | G1 |
| 1 | PRTR5V0U2X | Package_TO_SOT_SMD:SOT-143 | D2 |
| 1 | Reset | random-keyboard-parts:SKQG-1155865 | SW1 |
| 1 | USB_C_Receptacle_USB2.0 | Connector_USB:USB_C_Receptacle_HRO_TYPE-C-31-M-12 | J1 |
Questions
How big is the Tfk21-avr PCB?
It measures 76.2 × 115.5 mm and has 4 copper layers, 1.6 mm thick.
What parts does the Tfk21-avr use?
123 parts, built around the ATMEGA32U4-AU, IS31FL3733B-TQLS4-TR, WS2812B and PRTR5V0U2X. 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 Tfk21-avr KiCad files?
From the biosmanager/tfk repository on GitHub, at the commit this page was made from: the board is tfk21-avr/tfk21-avr.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the Tfk21-avr design in my own project?
Its repository states no licence, so its author keeps all rights: ask biosmanager before reusing the design.
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