4 layers90.5 × 67 mm
AS 4
beaked99/air-scales
2025-11-20. Updated all the footprints and symbols to their proper layouts. no more fkn errors. Hallefuckinglujah. Fucked up with LM74610 not using the right footprint. minor fix. 2025-11-16.
131 parts
4 layers
WatchBorad
ValentiWorkLearning/GradWork39Development board based on NRF52832 E73 module with C++20/CMake/VSCode based development flow
- Copper layers
- 4
- Thickness
- 1.6 mm
- Parts
- 119
- Nets
- 68
- Pads
- 385
- Tracks, vias
- 1,241, 162
- Pours
- 5
- Routed
- Yes
- KiCad
- KiCad 5 (file 20171130)
- Created
- 22 Sep 2019
- Updated
- 7 Apr 2023
Overview
WatchBorad is an open-source printed circuit board by ValentiWorkLearning, from the ValentiWorkLearning/GradWork repository on GitHub, published under the MIT licence. It is a 4-layer board with 119 parts on 68 nets, routed with 1,241 tracks and 162 vias.
It is built around the CAT4002ATD-GT3, M41T62Q6F and MAX17048G+T10, with the MAX809S, ME4055AM6G and TPS73501DRBR among its other parts. Its parts include 34 capacitors, 33 resistors, 11 ICs, 5 switches and 3 diodes. It belongs with the microcontroller boards boards and the nRF52 and nRF5x boards of this library.
Main components
9
CAT4002ATD-GT3
TSOT-23-6-40℃~+85℃ 1% 2 2.4V~5.5V 20mA Buck Built-in DC-DC Over-Temperature Protection (OTP) PWM TSOT-23-6 LED Drivers ROHSonsemiLED Drivers
M41T62Q6F
QFN-16-EP(3x3)-40℃~+85℃ 1.3V~4.4V 20uA 350nA Built-in I2C Watchdog timer、Programmable clock output、Alarm function Yes QFN-16-EP(3x3) Real Time Clocks ROHSSTMicroelectronicsReal Time Clocks
MAX17048G+T10
DFN-8-EP(2x2)-40℃~+85℃ 1 2.5V~4.5V 3uA I2C Lithium Battery Not supported Not supported DFN-8-EP(2x2) Battery Management ROHSMaxim Integrated (Analog Devices)Battery Management
MAX809S
SOT-23-40℃~+125℃ 1 140ms 1V~5.5V 2.93V 8uA Active Low Push-pull Voltage Detector SOT-23 Supervisor and Reset ICs ROHSUMWSupervisor And Reset ICsME4055AM6G
SOT-23-6-40℃~+85℃ 1 1.05A 4.2V 4V~6.5V 55uA Charging IC Lithium Battery SOT-23-6 Battery Management ROHSMICRONEBattery Management
TPS73501DRBR
VDFN-8-EP(3x3)-40℃~+125℃ 1 1.25V~6V 13.2uVrms 280mV@(500mA) 46uA 500mA 6.5V 68dB@(1kHz) Adjustable Positive Under Voltage Lockout、Over Current Protection、Over Temperature Protection、Enable VDFN-8-EP(3x3) Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSTexas InstrumentsVoltage Regulators - Linear, Low Drop Out (LDO) RegulatorsHX2301A
SOT-23-55℃~+150℃ 1 P-Channel 112mΩ@4.5V、140mΩ@2.5V 1W 2.3A 20V 3.2nC@4.5V 325pF 37pF 63pF 700mV P-Channel SOT-23 MOSFETs ROHSHXMOSFETsSL2300
SOT-23-55℃~+150℃ 1 N-channel 1.2V 1.2W 150pF 20V 4.2A 40mΩ@2.5V 650pF N-Channel SOT-23 MOSFETs ROHSSlkorMOSFETs
TYPE-C-31-M-17
SMD-30℃~+80℃ 1 20V 3,000 Cycles 5A 6.8mm 6P Female Surface Mount, Right Angle Type-C SMD USB Connectors ROHSHRO ElectronicsUSB Connectors
README
README.mdGradWork
Development board for smart-handwatch based on NRF52832 E73 module with C++20/CMake/VSCode based development flow
- Uses the C++20 features as wide as possible
- Uses С++20 coroutines for non-blocking interactions
- Port of LVGL 8.0 library for ST7789V/GC9A01 display and NRFSDK
- Simulator for fimware development without target MCU
- CI for Windows Simulator build and GCC build for target
Article:
C++20 Coroutines on NRF52832 with GTest
Revision v1.2
Revision v1.0
Parts
119| Qty | Value | Footprint | References |
|---|---|---|---|
| 23 | 10k | Resistor_SMD:R_0603_1608Metric | R1, R2, R10, R11, R12, R13, R14, R17, R18, R20, R21, R22, R25, R27, R31, R32 +7 |
| 20 | TestPoint | TestPoint:TestPoint_Pad_D2.0mm | TP1, TP2, TP3, TP4, TP5, TP10, TP11, TP12, TP13, TP14, TP15, TP16, TP17, TP18, TP19, TP20 +4 |
| 15 | 100 nF | Capacitor_SMD:C_0603_1608Metric | C6, C7, C10, C12, C14, C16, C22, C25, C26, C27, C29, C32, C36, C37, C38 |
| 10 | 10 uF | Capacitor_SMD:C_0603_1608Metric | C2, C8, C9, C20, C21, C23, C24, C28, C33, C40 |
| 6 | 330 | Resistor_SMD:R_0603_1608Metric | R15, R16, R26, R28, R29, R30 |
| 5 | SW_Push | OmronSwitch:SW_B3U-3000P | SW1, SW2, SW3, SW4, SW5 |
| 2 | 0.8 pF | Capacitor_SMD:C_0603_1608Metric | C13, C15 |
| 2 | 10 pF | Capacitor_SMD:C_0603_1608Metric | C1, C4 |
| 2 | 100 pF | Capacitor_SMD:C_0603_1608Metric | C3, C5 |
| 2 | 130 pF | Capacitor_SMD:C_0603_1608Metric | C18, C19 |
| 2 | HX2301A | Package_TO_SOT_SMD:SOT-23 | VT3, VT5 |
| 2 | SL2300 | Package_TO_SOT_SMD:SOT-23 | VT1, VT2 |
| 1 | 100n X7R 16V | Capacitor_SMD:C_0603_1608Metric | C34 |
| 1 | 10K | Resistor_SMD:R_0603_1608Metric | R34 |
| 1 | 1A 20V | Diodes_SMD:D_SMA_Handsoldering | D2 |
| 1 | 1K | Resistor_SMD:R_0603_1608Metric | R24 |
| 1 | 220k | Resistor_SMD:R_0603_1608Metric | R19 |
| 1 | 330k | Resistor_SMD:R_0603_1608Metric | R3 |
| 1 | Antenna_Chip | ANT2012LL13R2400A:ANT2012LL13R2400A | AE1 |
| 1 | Antenna_Loop | LocalFootprints:BatteryPads | AE2 |
| 1 | Battery_Cell | LocalFootprints:BatteryPads | BT1 |
| 1 | CAT4002ATD-GT3 | TO_SOT_Packages_SMD:SOT-23-6_Handsoldering | U3 |
| 1 | Crystal_GND24_Small | Crystals:Crystal_SMD_2016-4pin_2.0x1.6mm | X1 |
| 1 | Crystal_Small | Crystal:Crystal_SMD_3215-2Pin_3.2x1.5mm | Y1 |
| 1 | D | Diode_SMD:D_SOD-323 | D3 |
| 1 | D_TVS | LocalFootprints:TVS_DFN1006 | D1 |
| 1 | GC9A01 | LocalFootprints:GC9A01_Extended_FPC | U11 |
| 1 | L | Capacitor_SMD:C_0603_1608Metric | 3.9nH1 |
| 1 | LSM6DSRTR | LSM6DSRTR:LSM6DSRTR_LGA-14L | U1 |
| 1 | M41T62Q6F | M41T62Q6F:QFN50P300X300X100-17N | U10 |
| 1 | MAX17048G+T10 | LocalFootprints:MAX17048G | U6 |
| 1 | MAX809S | TO_SOT_Packages_SMD:SOT-23 | U9 |
| 1 | ME4055A | Package_TO_SOT_SMD:SOT-23-6 | U5 |
| 1 | MX25R1635F | LocalFootprints:W25Q128JVPIQ | U4 |
| 1 | Motor_DC | LocalFootprints:VibrationMorot4x4x11 | M1 |
| 1 | SL2300 | TO_SOT_Packages_SMD:SOT-23 | VT4 |
| 1 | SN74LVC2G74-EP_DCU_8 | SN74LVC2G74:SN74LVC2G74 | U7 |
| 1 | TPS73501DRBR | TPS73501DRBR:TPS73501DRBR | U12 |
| 1 | TYPE-C-31-M-17 | USB:TYPE-C-31-M-17 | J3 |
| 1 | nRF52832-QFxx | Housings_DFN_QFN:QFN-48-1EP_6x6mm_Pitch0.4mm | U2 |
Questions
What parts does the WatchBorad use?
119 parts, built around the CAT4002ATD-GT3, M41T62Q6F, MAX17048G+T10 and MAX809S. 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 WatchBorad KiCad files?
From the ValentiWorkLearning/GradWork repository on GitHub, at the commit this page was made from: the board is Schematic/WatchBorad/WatchBorad.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the WatchBorad design in my own project?
Its repository publishes it under the MIT 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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