4 layers234 × 84 mm
Main panel
google/mozc-devices
Circuit diagrams and firmware source code for Gboard DIY keyboards
234 parts3kApache-2.0
2 layers98 × 71 mm
Mozc dial
google/mozc-devices3kCircuit diagrams and firmware source code for Gboard DIY keyboards
- Size
- 98 × 71 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 112
- Nets
- 198
- Pads
- 604
- Tracks, vias
- 2,397, 249
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 25 Mar 2015
- Updated
- 1 Oct 2026
Overview
Mozc dial is an open-source printed circuit board by google, from the google/mozc-devices repository on GitHub, published under the Apache-2.0 licence. It is a 2-layer board of 98 × 71 mm with 112 parts on 198 nets, routed with 2,397 tracks and 249 vias.
It is built around the RP2040, W25Q128JVSIQ and TBD62083AFNG, with the 74HC238D and AMS1117-3.3 among its other parts. Its parts include 45 capacitors, 31 connectors, 14 resistors, 14 ICs and 3 switches. It belongs with the keyboards and input boards and the RP2040 boards of this library.
Main components
5
RP2040
LQFN-56(7x7)12bit 133MHz 30 LQFN-56(7x7) Microcontrollers (MCU/MPU/SOC) ROHSRaspberry PiMicrocontrollers (MCU/MPU/SOC)
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
TBD62083AFNG
SOIC188 Channel Sink Type DMOS Transistor ArrayToshibaUncategorised
74HC238D
SOP-16SOP-16 Signal Switches, Multiplexers, Decoders ROHSMDDSignal Switches, Multiplexers, Decoders
AMS1117-3.3
SOT-223-40℃~+125℃ 0.003%Vout 1 1.1V@(800mA) 15V 1A 3.3V 5mA 72dB@(120Hz) Fixed Over Current Protection、Short Circuit Protection、Thermal shutdown Positive SOT-223 Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSAdvanced Monolithic SystemsVoltage Regulators - Linear, Low Drop Out (LDO) Regulators
README
README.mdCircuit diagrams and firmware source code for Gboard DIY keyboards, previously known as Google Japanese Input / Gboard April Fools.
This is not an officially supported Google product.
Products
Please refer to the README in each directory for more details.
Parts
112| Qty | Value | Footprint | References |
|---|---|---|---|
| 36 | 100n | Capacitor_SMD:C_0402_1005Metric | C102, C103, C104, C105, C106, C107, C108, C109, C110, C111, C112, C113, C114, C115, C116, C117 +20 |
| 20 | Conn_01x05_Pin | Connector_PinHeader_2.54mm:PinHeader_1x05_P2.54mm_Vertical | J106, J107, J108, J109, J110, J111, J112, J113, J114, J115, J116, J117, J118, J119, J120, J121 +4 |
| 6 | Conn_01x01 | TestPoint:TestPoint_Pad_1.0x1.0mm | J104, J105, J202, J203, J302, J303 |
| 5 | TBD62083AFNG | Package_SO:SSOP-18_4.4x6.5mm_P0.65mm | U102, U103, U105, U107, U109 |
| 4 | 1K | Resistor_SMD:R_0402_1005Metric | R205, R207, R305, R307 |
| 4 | 1u | Capacitor_SMD:C_0603_1608Metric | C201, C209, C301, C309 |
| 4 | 20p | Capacitor_SMD:C_0402_1005Metric | C210, C211, C310, C311 |
| 4 | 27.4 | Resistor_SMD:R_0402_1005Metric | R201, R202, R301, R302 |
| 4 | 5.1K | Resistor_SMD:R_0402_1005Metric | R203, R204, R303, R304 |
| 4 | 74HC238 | Package_SO:SOP-16_3.9x9.9mm_P1.27mm | U104, U106, U108, U110 |
| 3 | MountingHole_3.2mm_M3 | MountingHole:MountingHole_3.2mm_M3 | REF1, REF2, REF3 |
| 3 | SW_Push | Gboard:SW_SMD_PUSH | SW101, SW201, SW301 |
| 2 | 10K | Resistor_SMD:R_0402_1005Metric | R206, R306 |
| 2 | 12MHz_GND24 | Crystal:Crystal_SMD_SeikoEpson_TSX3225-4Pin_3.2x2.5mm | Y201, Y301 |
| 2 | Conn_01x03 | Connector_PinSocket_2.54mm:PinSocket_1x03_P2.54mm_Vertical | J102, J103 |
| 2 | RP2040 | Package_DFN_QFN:QFN-56-1EP_7x7mm_P0.4mm_EP3.2x3.2mm | U201, U301 |
| 2 | USB_C_Receptacle | Gboard:USBC_24P | J201, J301 |
| 2 | W25Q128JVS | Package_SO:SOIC-8_5.3x5.3mm_P1.27mm | U202, U302 |
| 1 | 10u | Capacitor_SMD:C_0603_1608Metric | C101 |
| 1 | AMS1117-3.3 | Package_TO_SOT_SMD:SOT-223-3_TabPin2 | U101 |
| 1 | Conn_01x01 | TestPoint:TestPoint_Pad_2.0x2.0mm | J101 |
Questions
How big is the Mozc dial PCB?
It measures 98 × 71 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Mozc dial use?
112 parts, built around the RP2040, W25Q128JVSIQ, TBD62083AFNG and 74HC238D. 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 Mozc dial KiCad files?
From the google/mozc-devices repository on GitHub, at the commit this page was made from: the board is mozc-dial/board/main/main.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the Mozc dial design in my own project?
Its repository publishes it under the Apache-2.0 licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).
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