4 layers66 × 142 mm
4 layers50 × 50 mm
Watch
plumpastry/PHW2Plum's Embedded Devices Hardware and Firmware
- Size
- 50 × 50 mm
- Copper layers
- 4
- Thickness
- 1.6 mm
- Parts
- 99
- Nets
- 103
- Pads
- 413
- Tracks, vias
- 729, 234
- Pours
- 192
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 16 Feb 2026
- Updated
- 22 Mar 2026
Overview
Watch is an open-source printed circuit board by plumpastry, from the plumpastry/PHW repository on GitHub. It is a 4-layer board of 50 × 50 mm with 99 parts on 103 nets, routed with 729 tracks and 234 vias.
It is built around the NRF54L15-QFAA-R, ST25R3916B-AQET and ISM330DHCXTR, with the NPM1100-QDAA-R, LXRW0YV201-059 and W3008 among its other parts. Its parts include 52 capacitors, 13 resistors, 8 inductors, 5 ICs and 5 connectors. It belongs with the wearables boards and the nRF52 and nRF5x boards of this library.
Main components
7
NRF54L15-QFAA-R
QFN-48(6x6)Power-on reset (POR)、Undervoltage detection (BOR/LVD/LVR/LVI)、Watchdog reset、Software reset、External pin reset (NRST)、Built-in general-purpose timer、Calendar function、Built-in temperature sensor QFN-48(6x6) Microcontrollers (MCU/MPU/SOC) ROHSNordic SemiconMicrocontrollers (MCU/MPU/SOC)
ST25R3916B-AQET
UFQFPN-32(5x5)13.56MHz 2.6V~5.5V 53Kbit/s、424Kbit/s、848Kbit/s Built-in antenna driver、Low power wake-up FeliCa,ISO 14443A,ISO 14443B,ISO 15693,NFC I2C,SPI UFQFPN-32(5x5) RFID ICs ROHSSTMicroelectronicsRFID ICs
ISM330DHCXTR
LGA-14LLGA-14L New Arrivals ROHSTexas InstrumentsUncategorisedNPM1100-QDAA-R
QFN-24(4x4)-40℃~+85℃ 1 4.1V~6.7V Lithium-ion/Polymer QFN-24(4x4) Power Management - Specialized ROHSNordic SemiconBattery Management
LXRW0YV201-059
SMD,0.6x0.6x0.3mm-25℃~+85℃ 0.28mm 0.65mm 0.6mm 100pF~200pF 50V SMD,0.6x0.6x0.3mm Trimmers, Variable Capacitors ROHSMurataTrimmers, Variable Capacitors
W3008
1206-40℃~+85℃、-40℃~+85℃、-40℃~+85℃ 1.1dBi 1.1mm 1.6mm 2.44175GHz 3.2mm 50Ω 5W 83.5MHz 1206 Antennas ROHSPulse ElecAntennas
XRCGB27M120F3M13R0
SMD2016-4P-30℃~+85℃ 10pF 27.12MHz 60Ω ±30ppm ±40ppm SMD2016-4P Crystals ROHSMurataCrystals
README
README.mdPlum's HardWare
PHW-Board#-Part#-Revision#
PHW-1-1-2:
NFC smartwatch development board
PHW-1-1-1:
NFC smartwatch original board - infeasible manual assembly due to STM32WL
Parts
99| Qty | Value | Footprint | References |
|---|---|---|---|
| 10 | C0.1uF | Capacitor_SMD:C_0402_1005Metric | C9, C10, C14, C15, C18, C22, C23, C24, C25, C37 |
| 6 | C10nF | Capacitor_SMD:C_0201_0603Metric | C27, C28, C30, C32, C34, C36 |
| 6 | R10K | Resistor_SMD:R_0402_1005Metric | R4, R7, R8, R14, R15, R16 |
| 5 | C2.2uF | Capacitor_SMD:C_0201_0603Metric | C16, C29, C31, C33, C35 |
| 5 | C2.2uF | Capacitor_SMD:C_0402_1005Metric | C3, C4, C8, C26, C51 |
| 4 | C10uF | Capacitor_SMD:C_0402_1005Metric | C2, C5, C6, C21 |
| 4 | C4.7uF | Capacitor_SMD:C_0402_1005Metric | C7, C11, C13, C17 |
| 4 | LXRW0YV201-059 | varicap:LXRW0YV201059 | C1, C43, C44, C45 |
| 3 | Conn_01x02_Pin | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | J3, J5, J6 |
| 3 | SW_Push | buttons:SW_B3U-1100P | SW2, SW3, SW4 |
| 2 | 10pF | Capacitor_SMD:C_0402_1005Metric | C46, C48 |
| 2 | 220pF | Capacitor_SMD:C_0402_1005Metric | C47, C49 |
| 2 | 620pF | Capacitor_SMD:C_0402_1005Metric | C41, C42 |
| 2 | C12pF | Capacitor_SMD:C_0402_1005Metric | C39, C40 |
| 2 | FerriteBead | Inductor_SMD:L_0402_1005Metric | FB1, FB2 |
| 2 | L3.5nH | Inductor_SMD:L_0201_0603Metric | L7, L8 |
| 2 | LEMC1 | Inductor_SMD:L_0402_1005Metric | L3, L4 |
| 2 | R1.6 | Resistor_SMD:R_0402_1005Metric | R11, R12 |
| 1 | 212134-0002 | rotary_enc:2121340002 | J2 |
| 1 | 32MHz | Crystal:Crystal_SMD_2016-4Pin_2.0x1.6mm | Y2 |
| 1 | Antenna_Loop | Capacitor_SMD:C_0805_2012Metric | AE1 |
| 1 | C0.3pF | Capacitor_SMD:C_0201_0603Metric | C55 |
| 1 | C1.5pF | Capacitor_SMD:C_0201_0603Metric | C53 |
| 1 | C1uF | Capacitor_SMD:C_0402_1005Metric | C38 |
| 1 | C2.0pF | Capacitor_SMD:C_0201_0603Metric | C54 |
| 1 | C2.2nF | Capacitor_SMD:C_0402_1005Metric | C50 |
| 1 | C3.9pF | Capacitor_SMD:C_0402_1005Metric | C52 |
| 1 | Conn_02x10_Odd_Even | Connector_PinHeader_2.54mm:PinHeader_2x10_P2.54mm_Vertical | J4 |
| 1 | DRV2625YFFR | lra_driver:BGA9C40P3X3_147X133X62 | IC1 |
| 1 | HD-LA0503-LW28 | rotary_enc:PUI_HD-LA0503-LW28 | B1 |
| 1 | ISM330DHCXTR | accel:LSM6DS3USTR | IC3 |
| 1 | L10uH | Inductor_SMD:L_1008_2520Metric | L2 |
| 1 | L2.2uH | Inductor_SMD:L_0805_2012Metric | L1 |
| 1 | L2.7nH | Inductor_SMD:L_0201_0603Metric | L6 |
| 1 | L4.7uH | Inductor_SMD:L_0603_1608Metric | L5 |
| 1 | NPM1100-QDAA-R | rotary_enc:QFN50P400X400X90-25N-D | IC4 |
| 1 | NRF54L15-QFAA-R | Package_DFN_QFN:QFN-48-1EP_6x6mm_P0.4mm_EP4.6x4.6mm | U2 |
| 1 | NTC | Capacitor_SMD:C_0201_0603Metric | TH1 |
| 1 | R15k | Resistor_SMD:R_0402_1005Metric | R1 |
| 1 | R1k | Capacitor_SMD:C_0402_1005Metric | R3 |
| 1 | R510K | Resistor_SMD:R_0402_1005Metric | R6 |
| 1 | R750K | Resistor_SMD:R_0402_1005Metric | R2 |
| 1 | R75K | Resistor_SMD:R_0402_1005Metric | R5 |
| 1 | RotaryEncoder | rotary_enc:alps_ec05e | SW1 |
| 1 | ST25R3916B-AQET | nfc:QFN50P500X500X60-33N-D | IC2 |
| 1 | TPS61046YFFR | rotary_enc:BGA6C40P2X3_88X123X62 | PS1 |
| 1 | Trans Rights now Back | beepy:Trans Rights now Back | TRNSRTS |
| 1 | Trans Rights now Front | beepy:Trans Rights now Front | TRNSRTS |
| 1 | W3008 | w3008:ANTENNA_W3008 | ANT1 |
| 1 | XRCGB27M120F3M13R0 | rotary_enc:XRCGB | Y1 |
| 1 | ~ | rotary_enc:P0.7_FPC | O1 |
Questions
How big is the Watch PCB?
It measures 50 × 50 mm and has 4 copper layers, 1.6 mm thick.
What parts does the Watch use?
99 parts, built around the NRF54L15-QFAA-R, ST25R3916B-AQET, ISM330DHCXTR and NPM1100-QDAA-R. 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 KiCad files?
From the plumpastry/PHW repository on GitHub, at the commit this page was made from: the board is nfc-watch/hardware/watch.kicad_pcb and its schematic nfc-watch/hardware/watch.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Watch design in my own project?
Its repository states no licence, so its author keeps all rights: ask plumpastry before reusing the design.
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