8 layers37 × 40.5 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.
206 partsApache-2.0
4 layers22.3 × 13.9 mm
Rfid module
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
- 22.3 × 13.9 mm
- Copper layers
- 4
- Thickness
- 0.78 mm
- Parts
- 66
- Nets
- 55
- Pads
- 188
- Tracks, vias
- 361, 60
- Pours
- 26
- Routed
- Yes
- KiCad
- KiCad 8.0 (file 20240108)
- Created
- 11 Dec 2023
- Updated
- 17 Mar 2025
Overview
Rfid module 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 a 4-layer board of 22.3 × 13.9 mm with 66 parts on 55 nets, routed with 361 tracks and 60 vias.
It is built around the MAX17291BANT+T, MAX9027EBT+T and DMN21D2UFB-7B, with the ACDBQC0130L-HF and DMP21D5UFB4-7B among its other parts. Its parts include 29 resistors, 19 capacitors, 5 ICs, 5 transistors and 2 inductors. It belongs with the radio and wireless boards and the STM32 boards of this library.
Main components
5MAX17291BANT+T
-- Lack of specifications ROHSMaxim Integrated (Analog Devices)Uncategorised
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)ComparatorsDMN21D2UFB-7B
X1-DFN1006-3-55℃~+150℃ 1 N-channel 1V 2.8pF 20V 27.6pF 3Ω@1.5V 4pF 760mA 900mW 930pC@10V N-Channel X1-DFN1006-3 MOSFETs ROHSDiodes IncorporatedMOSFETs
ACDBQC0130L-HF
SOD-923F100mA 10uA@10V 300mV@10mA 35V SOD-923F Schottky Diodes ROHSComchipSchottky Diodes
DMP21D5UFB4-7B
X2-DFN1006-3-55℃~+150℃ 1 P-Channel 1V 20V 3Ω@1.5V 46.1pF 500pC@4.5V 700mA 950mW P-Channel X2-DFN1006-3 MOSFETs ROHSDiodes IncorporatedMOSFETs
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
66| Qty | Value | Footprint | References |
|---|---|---|---|
| 6 | 10k | Resistor_SMD:R_0402_1005Metric | R201, R207, R213, R220, R222, R401 |
| 6 | 1k | Resistor_SMD:R_0402_1005Metric | R204, R208, R210, R214, R218, R221 |
| 4 | 1.5mm | TestPoint:TestPoint_Pad_D1.5mm | TP101, TP201, TP202, TP203 |
| 4 | 100n | Capacitor_SMD:C_0402_1005Metric | C203, C211, C302, C304 |
| 4 | DMN21D2UFB-7B | watch_footprints:DMN21D2UFB7B | Q201, Q203, Q204, Q401 |
| 3 | 100R | Resistor_SMD:R_0402_1005Metric | R202, R206, R215 |
| 3 | 100p | Capacitor_SMD:C_0402_1005Metric | C208, C212, C213 |
| 2 | 100k | Resistor_SMD:R_0402_1005Metric | R402, R504 |
| 2 | 10n | Capacitor_SMD:C_0402_1005Metric | C207, C209 |
| 2 | 1M | Resistor_SMD:R_0402_1005Metric | R205, R503 |
| 2 | 1u | Capacitor_SMD:C_0402_1005Metric | C204, C303 |
| 2 | 330k | Resistor_SMD:R_0402_1005Metric | R217, R219 |
| 2 | 33k | Resistor_SMD:R_0402_1005Metric | R211, R212 |
| 2 | 4n7 | Capacitor_SMD:C_0402_1005Metric | C206, C210 |
| 2 | 4u7 | Capacitor_SMD:C_0402_1005Metric | C301, C502 |
| 1 | 10-Pin_Pogo_Connector_Male | watch_footprints:10-Pin Pogo Connector Male | J401 |
| 1 | 10u | Inductor_SMD:L_TDK_MLZ1608 | L501 |
| 1 | 1n | Capacitor_SMD:C_0402_1005Metric | C201 |
| 1 | 20k | Resistor_SMD:R_0402_1005Metric | R223 |
| 1 | 220n | Capacitor_SMD:C_0402_1005Metric | C202 |
| 1 | 22u | Capacitor_SMD:C_0402_1005Metric | C501 |
| 1 | 330 | Resistor_SMD:R_0402_1005Metric | R216 |
| 1 | 330p | Capacitor_SMD:C_0402_1005Metric | C205 |
| 1 | 3M48 | Resistor_SMD:R_0402_1005Metric | R501 |
| 1 | 402k | Resistor_SMD:R_0402_1005Metric | R502 |
| 1 | 4k7 | Resistor_SMD:R_0402_1005Metric | R209 |
| 1 | 5k1 | Resistor_SMD:R_0402_1005Metric | R203 |
| 1 | ACDBQC0130L-HF | Diode_SMD:D_SOD-923 | D201 |
| 1 | DMP21D5UFB4-7B | watch_footprints:DMP21D5UFB47B | Q202 |
| 1 | MAX17291BANT+T | watch_footprints:BGA6C40P3X2_127X87X50 | IC501 |
| 1 | MAX9027EBT+T | watch_footprints:BGA6C50P3X2_152X100X69 | IC202 |
| 1 | STM32G071G8Ux | Package_DFN_QFN:QFN-28_4x4mm_P0.5mm | U301 |
| 1 | TLV9004SIRTER | watch_footprints:QFN50P300X300X80-17N-D | IC201 |
| 1 | TR1102-0491J | watch_footprints:TR1102-0491J | L201 |
| 1 | Watch_Module_Outline_V2 | watch_footprints:Watch Module Outline V2 | U101 |
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Questions
How big is the Rfid module PCB?
It measures 22.3 × 13.9 mm and has 4 copper layers, 0.78 mm thick.
What parts does the Rfid module use?
66 parts, built around the MAX17291BANT+T, MAX9027EBT+T, DMN21D2UFB-7B and ACDBQC0130L-HF. 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 Rfid module KiCad files?
From the ben5049/Smart-Watch repository on GitHub, at the commit this page was made from: the board is PCBs/rfid_module_v1.1/rfid_module.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 Rfid module 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).