8 layers37 × 42 mm
Watch main
ben5049/Smart-Watch
This project aims to take a cheap, common smart watch and upgrade it by replacing the screen and all internal electronics with custom hardware.
157 partsApache-2.0
8 layers37 × 40.5 mm
Watch main
ben5049/Smart-WatchThis project aims to take a cheap, common smart watch and upgrade it by replacing the screen and all internal electronics with custom hardware.
- Size
- 37 × 40.5 mm
- Copper layers
- 8
- Thickness
- 0.78 mm
- Parts
- 206
- Nets
- 363
- Pads
- 1,026
- Tracks, vias
- 2,461, 643
- Pours
- 44
- Routed
- Yes
- KiCad
- KiCad 7 (file 20221018)
- Created
- 11 Dec 2023
- Updated
- 17 Mar 2025
Overview
Watch main is an open-source printed circuit board by ben5049, from the ben5049/Smart-Watch repository on GitHub, published under the Apache-2.0 licence. It is an 8-layer board of 37 × 40.5 mm with 206 parts on 363 nets, routed with 2,461 tracks and 643 vias.
It is built around the ICE40UP5K-UWG30ITR1K, STM32U5A9NJH6Q and BGA725L6E6327FTSA1, with the NRF5340-QKAA-R7, TESEO-LIV3FL and ADP5301ACBZ-2-R7 among its other parts. Its parts include 99 capacitors, 36 resistors, 17 ICs, 15 inductors and 5 transistors. It belongs with the wearables boards and the STM32, nRF52 and nRF5x and FPGA and CPLD boards of this library.
Main components
12
ICE40UP5K-UWG30ITR1K
WLCSP-30(2.1x2.5)-40℃~+100℃ 1171456bit 5280 660 WLCSP-30(2.1x2.5) Programmable Logic Device (CPLDs/FPGAs) ROHSLatticeProgrammable Logic Device (CPLDs/FPGAs)
STM32U5A9NJH6Q
TFBGA-216(13x13)-40℃~+85℃ 1.71V~3.6V 156 160MHz 2.5MB 32 Bit 4MB ARM Cortex-M33 Built-in+External FLASH TFBGA-216(13x13) Microcontrollers (MCU/MPU/SOC) ROHSSTMicroelectronicsMicrocontrollers (MCU/MPU/SOC)
BGA725L6E6327FTSA1
DFN-6(0.7x1.1)-15dBm -2dBm -40℃~+85℃ 0.65dB 1.55GHz~1.615GHz 1.5V~3.6V 14dB 20dB 20dB 3.6mA Low-power mode、Digital control interface、Electrostatic protection DFN-6(0.7x1.1) RF Amplifiers ROHSInfineon TechnologiesRF Amplifiers
NRF5340-QKAA-R7
AQFN-94(7x7)-104dBm -40℃~+105℃ 1.7V~5.5V 2.4GHz 2.6mA 2Mbps 3.2mA 3dBm Bluetooth、802.15.4 SPI、USB、UART、ADC、I2S、PWM transceiver AQFN-94(7x7) RF Transceiver ICs ROHSNordic SemiconRF Transceiver ICsTESEO-LIV3FL
LCC-18(9.7x10.1)-163dBm -40℃~+85℃ 1.75V~4.2V GPS、BeiDou、Galileo、GLONASS Hot start acceleration、RTC backup power LCC-18(9.7x10.1) GNSS Modules ROHSSTMicroelectronicsGNSS Modules
ADP5301ACBZ-2-R7
WLCSP-9(1.6x1.9)-40℃~+125℃@(TJ) 1 180nA 2.15V~6.5V 2MHz 50mA、500mA 800mV~5V Adjustable Buck Built-in Overcurrent Protection、Output discharge、Operating status indication、Cycle-by-cycle current limiting、Frequency synchronization Step-down type Yes WLCSP-9(1.6x1.9) DC-DC Converters ROHSAnalog DevicesDC-DC Converters
OPT3004DNPR
WSON-6-EP(2x2)-40℃~+85℃ 0.65mm 1.6V~3.6V 1.8uA 2mm 2mm 83klx I2C Light Intensity WSON-6-EP(2x2) Ambient Light Sensors ROHSTexas InstrumentsAmbient Light Sensors
S26HS512TGABHI000
VBGA-24-40℃~+85℃ 1.7V~2V 512Mbit SPI VBGA-24 NOR FLASH ROHSInfineon TechnologiesNOR FLASHADP5360ACBZ-2-R7
WLCSP-32(2.6x2.6)-40℃~+85℃ 1 2V 3.5uA 320mA 4.1V~6.8V 4.2V Charging IC、Protection IC I2C Lithium Battery Support WLCSP-32(2.6x2.6) Power Management - Specialized ROHSAnalog DevicesBattery Management
LSM6DSO16IS
LGA-14(2.5x3)-40℃~+85℃ 1.71V~3.6V 16bit 6uA IMU (accelerometer + gyroscope) SPI、I2C X,Y,Z X,Y,Z ±16g ±2000dps LGA-14(2.5x3) Accelerometers ROHSSTMicroelectronicsAccelerometers
MAX9027EBT+T
WLP-6-40℃~+85℃ 1 1.6us 1.8V~5.5V 15us 300uV 450nA 4mV 4nA 6V CMOS Push-pull Rail-to-Rail Input, Rail-to-Rail Output WLP-6 Comparators ROHSMaxim Integrated (Analog Devices)Comparators
NVT4858HKZ
XQFN-16(1.8x2.6)-40℃~+85℃ 1 1.08V~1.95V 1.65V~3.6V 104Mbps 6 Bidirectional XQFN-16(1.8x2.6) Translators, Level Shifters ROHSNXP SemiconductorsTranslators, Level Shifters
README
README.mdSmart-Watch
Introduction
This project aims to take a cheap, common smart watch and upgrade it by replacing the screen and all internal electronics with custom hardware.
Repository structure
- /Documentation - all the documents to do with the project, including hardware and software design, datasheets, reference manuals, images etc.
- /PCBs - KiCad projects for all the circuit boards used, libraries for all components, and old versions.
- /Firmware - code for STM32 and nRF53 microcontrollers, including drivers for most chips.
- /CAD - 3D models for components and assemblies, as well as 3D printing files.
- /Simulations - Spice simulations of certain (mainly analogue) circuits.
Parts
206| Qty | Value | Footprint | References |
|---|---|---|---|
| 43 | 100n | Capacitor_SMD:C_0402_1005Metric | C1003, C1004, C1005, C1102, C1204, C1205, C1206, C1207, C1208, C1210, C1302, C1304, C1305, C1306, C1307, C1703 +27 |
| 22 | 1.5mm | TestPoint:TestPoint_Pad_D1.5mm | TP201, TP202, TP203, TP204, TP205, TP206, TP207, TP208, TP209, TP301, TP302, TP303, TP801, TP1701, TP1702, TP1703 +6 |
| 15 | 10u | Capacitor_SMD:C_0402_1005Metric | C203, C204, C205, C206, C207, C208, C209, C210, C906, C919, C1101, C1303, C1401, C1403, C1404 |
| 10 | 1u | Capacitor_SMD:C_0402_1005Metric | C202, C301, C302, C310, C311, C316, C905, C1001, C1002, C1704 |
| 7 | 4k7 | Resistor_SMD:R_0402_1005Metric | R801, R802, R803, R804, R805, R806, R1709 |
| 6 | 10k | Resistor_SMD:R_0402_1005Metric | R201, R401, R1701, R1713, R1720, R1722 |
| 6 | 1k | Resistor_SMD:R_0402_1005Metric | R1704, R1708, R1710, R1714, R1718, R1721 |
| 5 | 4u7 | Capacitor_SMD:C_0402_1005Metric | C916, C1201, C1202, C1203, C1209 |
| 4 | 10n | Capacitor_SMD:C_0402_1005Metric | C401, C1501, C1707, C1709 |
| 4 | 10u | Inductor_SMD:L_TDK_MLZ1608 | L301, L302, L1401, L1402 |
| 4 | 6p | Capacitor_SMD:C_0402_1005Metric | C801, C802, C803, C804 |
| 3 | 100R | Resistor_SMD:R_0402_1005Metric | R1202, R1702, R1715 |
| 3 | 100p | Capacitor_SMD:C_0402_1005Metric | C1708, C1712, C1713 |
| 3 | 2u2 | Capacitor_SMD:C_0402_1005Metric | C201, C920, C921 |
| 3 | DMN21D2UFB-7B | watch_footprints:DMN21D2UFB7B | Q1701, Q1703, Q1704 |
| 2 | 100k | Resistor_SMD:R_0402_1005Metric | R202, R204 |
| 2 | 1n5 | Inductor_SMD:L_0402_1005Metric | L1601, L1604 |
| 2 | 220n | Capacitor_SMD:C_0402_1005Metric | C1301, C1702 |
| 2 | 330k | Resistor_SMD:R_0402_1005Metric | R1717, R1719 |
| 2 | 33k | Resistor_SMD:R_0402_1005Metric | R1711, R1712 |
| 2 | 4R7 | Resistor_SMD:R_0402_1005Metric | R1706, R1707 |
| 2 | 4n7 | Capacitor_SMD:C_0402_1005Metric | C1706, C1710 |
| 2 | 4u7 | Inductor_SMD:L_Murata_DFE201610P | L201, L202 |
| 1 | 0R | Resistor_SMD:R_0402_1005Metric | R1601 |
| 1 | 0n6 | Inductor_SMD:L_0402_1005Metric | L1602 |
| 1 | 0p7 | Capacitor_SMD:C_0402_1005Metric | C315 |
| 1 | 100nF | Capacitor_SMD:C_0402_1005Metric | C1402 |
| 1 | 105162-0001 | watch_footprints:105162-0001 | J1101 |
| 1 | 11k8 | Resistor_SMD:R_0402_1005Metric | R203 |
| 1 | 120p | Capacitor_SMD:C_0402_1005Metric | C402 |
| 1 | 16MHz | Crystal:Crystal_SMD_2016-4Pin_2.0x1.6mm | Y801 |
| 1 | 1M | Resistor_SMD:R_0402_1005Metric | R1705 |
| 1 | 1n | Capacitor_SMD:C_0402_1005Metric | C1701 |
| 1 | 20k | Resistor_SMD:R_0402_1005Metric | R1723 |
| 1 | 2n2 | Capacitor_SMD:C_0402_1005Metric | C307 |
| 1 | 2n2 | Inductor_SMD:L_0402_1005Metric | L303 |
| 1 | 2n7 | Inductor_SMD:L_0402_1005Metric | L1603 |
| 1 | 2u2 | Inductor_SMD:L_TDK_MLZ1608 | L203 |
| 1 | 2u2 | Inductor_SMD:L_Murata_DFE201610P | L901 |
| 1 | 32.768kHz | Crystal:Crystal_SMD_2012-2Pin_2.0x1.2mm | Y802 |
| 1 | 32MHz | Crystal:Crystal_SMD_2016-4Pin_2.0x1.6mm | Y301 |
| 1 | 330 | Resistor_SMD:R_0402_1005Metric | R1716 |
| 1 | 330p | Capacitor_SMD:C_0402_1005Metric | C1705 |
| 1 | 43p | Capacitor_SMD:C_0402_1005Metric | C1601 |
| 1 | 5k1 | Resistor_SMD:R_0402_1005Metric | R1703 |
| 1 | 7n5 | Inductor_SMD:L_0402_1005Metric | L401 |
| 1 | 7p5 | Capacitor_SMD:C_0402_1005Metric | C1602 |
| 1 | ACDBQC0130L-HF | Diode_SMD:D_SOD-923 | D1701 |
| 1 | ADP5301ACBZ-2-R7 | watch_footprints:BGA9C50P3X3_165X187X66 | IC202 |
| 1 | ADP5360ACBZ-2-R7 | watch_footprints:ADP5360ACBZ1R7 | IC201 |
| 1 | ANT161575TT-3000A1 | watch_footprints:ANT161575TT3000A1 | ANT1601 |
| 1 | AXG110144A | watch_footprints:AXG110144A | J601 |
| 1 | AXG120144 | watch_footprints:AXG120144 | J701 |
| 1 | B39162B4327P810 | watch_footprints:B39162B4327P810 | FL401 |
| 1 | BGA725L6E6327FTSA1 | watch_footprints:BGS12SN6E6327XTSA1 | IC401 |
| 1 | DMP2104LP-7 | watch_footprints:DMP2104LP7 | Q201 |
| 1 | DMP21D5UFB4-7B | watch_footprints:DMP21D5UFB47B | Q1702 |
| 1 | EVP-AEJB2A | watch_footprints:Panasonic-EVP-AEJB2A-MFG | SW1501 |
| 1 | FH26W-45S-0.3SHW(60) | watch_footprints:FH26W-45S-0.3SHW(60) | J501 |
| 1 | GPS_&_BT_Antenna_Keepout | watch_footprints:GPS & BT Antenna | U1601 |
| 1 | ICE40UP5K-UWG30ITR1K | watch_footprints:BGA30C40P5X6_211X254X60_modified | IC1201 |
| 1 | IIS2MDCTR | watch_footprints:IIS2MDCTR | IC1301 |
| 1 | IM70D122V01XTMA1 | watch_footprints:PG-TLGA-5-2_INF | MIC1801 |
| 1 | LSM6DSO16IS | watch_footprints:LGA14_LSM6_STM | U1301 |
| 1 | MAX9027EBT+T | watch_footprints:BGA6C50P3X2_152X100X69 | IC1702 |
| 1 | NRF5340-QKAA-R7 | watch_footprints:NRF5340-QKAA-R7_modified | U301 |
| 1 | NVT4858HKZ | watch_footprints:NVT4858HKZ | IC1101 |
| 1 | OPT3004DNPR | watch_footprints:SON65P200X200X65-7N-D | IC1302 |
| 1 | S26HS512TGABHI000 | watch_footprints:BGA24C100P5X5_600X800X100 | IC1001 |
| 1 | STM32U5A9NJH6Q | watch_footprints:TFBGA216_13X13_STM | U801 |
| 1 | TESEO-LIV3FL | watch_footprints:TESEOLIV3FL | U401 |
| 1 | TLV9004SIRTER | watch_footprints:QFN50P300X300X80-17N-D | IC1701 |
| 1 | TPS65631WDSKR | watch_footprints:SON50P250X250X80-11N-D | IC1401 |
| 1 | TR1102-0491J | watch_footprints:TR1102-0491J | L1701 |
| 1 | Watch_Outline | watch_footprints:Watch Outline V1 | U101 |
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Questions
How big is the Watch main PCB?
It measures 37 × 40.5 mm and has 8 copper layers, 0.78 mm thick.
What parts does the Watch main use?
206 parts, built around the ICE40UP5K-UWG30ITR1K, STM32U5A9NJH6Q, BGA725L6E6327FTSA1 and NRF5340-QKAA-R7. 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 Watch main KiCad files?
From the ben5049/Smart-Watch repository on GitHub, at the commit this page was made from: the board is PCBs/archived/watch_main_v1/watch_main.kicad_pcb and its schematic PCBs/archived/rfid_module_v1/boost_converter.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Watch main 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).