2 layers50.7 × 23.5 mm
Plajtime aux
Plajta/PlajTime-Hardware
Here lays the current and past HW designs of our PlajTime smartwatch. That includes all the boards and the chassis.
21 parts3CC-BY-SA-4.0
6 layers15.2 × 34 mm
Plajtime main
Plajta/PlajTime-Hardware3Here lays the current and past HW designs of our PlajTime smartwatch. That includes all the boards and the chassis.
- Size
- 15.2 × 34 mm
- Copper layers
- 6
- Thickness
- 1 mm
- Parts
- 85
- Nets
- 96
- Pads
- 510
- Tracks, vias
- 940, 200
- Pours
- 278
- Routed
- Yes
- KiCad
- KiCad 10.0 (file 20260206)
- Created
- 19 Sep 2025
- Updated
- 7 Nov 2026
Overview
Plajtime main is an open-source printed circuit board by Plajta, from the Plajta/PlajTime-Hardware repository on GitHub, published under the CC-BY-SA-4.0 licence. It is a 6-layer board of 15.2 × 34 mm with 85 parts on 96 nets, routed with 940 tracks and 200 vias.
It is built around the RP2350A, TPS628438YKAR and W25Q64JWBYIM TR, with the W25Q64JWUUIQ, BMA456 and MAX17055ETB+ among its other parts. Its parts include 46 capacitors, 12 resistors, 10 connectors, 8 ICs and 6 inductors. It belongs with the RP2350 and nRF52 and nRF5x boards of this library.
Main components
6
RP2350A
QFN-60-EP(7x7)Power-on reset (POR)、Undervoltage detection (BOR/LVD/LVR/LVI)、Watchdog reset、Integrated LDO、True random number generator (TRNG)、Hardware ECC check QFN-60-EP(7x7) Microcontrollers (MCU/MPU/SOC) ROHSRaspberry PiMicrocontrollers (MCU/MPU/SOC)
TPS628438YKAR
DSBGA-6(0.6x1)-40℃~+125℃ 1 1.5MHz 1.8V~3.6V 1.8V~5.5V 275nA 600mA Adjustable Buck Built-in Step-down type Yes DSBGA-6(0.6x1) DC-DC Converters ROHSTexas InstrumentsDC-DC ConvertersW25Q64JWBYIM TR
WLCSP-12(2x2.3)-40℃~+85℃ 1.7V~1.95V 100,000 cycles 133MHz 20 Years 3ms 64Mbit SPI WLCSP-12(2x2.3) NOR FLASH ROHSWinbond ElecNOR FLASH
W25Q64JWUUIQ
USON8-4mmX3mmUSON-8-(4X3) New Arrivals ROHSWinbond ElecNOR FLASH
BMA456
LGA-12(2x2)-40℃~+85℃ 1.62V~3.6V 16bit 1KB 3.5uA Accelerometer SPI、I2C X,Y,Z ±16g LGA-12(2x2) Accelerometers ROHSBosch SensortecAccelerometers
MAX17055ETB+
TDFN-10-EP(2x2.5)-40℃~+85℃ 2.3V~4.9V 7uA I2C Lithium Battery、LiFePO4 Battery Monitoring IC Not supported Support TDFN-10-EP(2x2.5) Battery Management ROHSAnalog DevicesBattery Management
README
README.mdPlajTime Hardware
This repository has the full history of PlajTime hardware development. Before 19.9.2025 development took place in a single private repository and it was starting to be a little bit messy. With beginning work on PlajTime's second prototype we made the decision to split the repos and make the code and design finally available.
What about the older versions?
Every "release" will have it's own tag so you (and we) can look at the older versions and laugh how bad at engineering we are.
License
This project is licensed under the Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.
Parts
85| Qty | Value | Footprint | References |
|---|---|---|---|
| 19 | 0.1uF | Capacitor_SMD:C_0201_0603Metric | C10, C11, C14, C16, C18, C19, C20, C21, C22, C23, C24, C25, C27, C30, C36, C38 +3 |
| 10 | 4.7uF | Capacitor_SMD:C_0402_1005Metric | C1, C6, C8, C9, C12, C17, C31, C35, C41, C43 |
| 5 | 10k | Resistor_SMD:R_0201_0603Metric | R8, R9, R10, R11, R12 |
| 3 | 1uF | Capacitor_SMD:C_0201_0603Metric | C2, C29, C42 |
| 2 | 10uF | Capacitor_SMD:C_0402_1005Metric | C13, C15 |
| 2 | 12pF_H | Capacitor_SMD:C_0201_0603Metric | C32, C33 |
| 2 | 15pF_H | Capacitor_SMD:C_0201_0603Metric | C3, C4 |
| 2 | 270pF_H | Capacitor_SMD:C_0201_0603Metric | C44, C45 |
| 2 | Conn_Coaxial | Library:W.FL_Hirose_W.FL2-R-SMT-1_Vertical | J6, J9 |
| 2 | TBD | Resistor_SMD:R_0201_0603Metric | R13, R14 |
| 2 | TBD | Capacitor_SMD:C_0201_0603Metric | C46, C47 |
| 1 | 0.47uF | Capacitor_SMD:C_0201_0603Metric | C26 |
| 1 | 1.2pF_H | Capacitor_SMD:C_0201_0603Metric | C34 |
| 1 | 10m | Resistor_SMD:R_0402_1005Metric | R5 |
| 1 | 10uH | Inductor_SMD:L_0402_1005Metric | L6 |
| 1 | 133k | Resistor_SMD:R_0201_0603Metric | R2 |
| 1 | 13MHz | Oscillator:Oscillator_SMD_Abracon_ASCO-4Pin_1.6x1.2mm | Y1 |
| 1 | 15nH | Inductor_SMD:L_0201_0603Metric | L5 |
| 1 | 1k | Resistor_SMD:R_0201_0603Metric | R4 |
| 1 | 1pF_H | Capacitor_SMD:C_0201_0603Metric | C37 |
| 1 | 1uH | Inductor_SMD:L_0805_2012Metric | L2 |
| 1 | 2.2nH | Resistor_SMD:R_0201_0603Metric | L3 |
| 1 | 3.3uH | Inductor_SMD:L_0603_1608Metric | L1 |
| 1 | 32.768kHz Crystal | Crystal:Crystal_SMD_MicroCrystal_CM9V-T1A-2Pin_1.6x1.0mm | Y3 |
| 1 | 32MHz | Crystal:Crystal_SMD_WE_IQXC-26-4Pin_1.6x1.2mm | Y2 |
| 1 | 33 | Resistor_SMD:R_0201_0603Metric | R3 |
| 1 | 4.7nH | Inductor_SMD:L_0201_0603Metric | L4 |
| 1 | 7.32k | Resistor_SMD:R_0201_0603Metric | R1 |
| 1 | 820pF | Capacitor_SMD:C_0201_0603Metric | C40 |
| 1 | BMA456 | Library:LGA-12_2x2mm_P0.5mm | U6 |
| 1 | Battery Connector | Library:CONN_505066-0622_MOL | J7 |
| 1 | Display connector | Library:ConnectorDisplay-30 | J4 |
| 1 | Extention connector | Library:5050660822 | J5 |
| 1 | Internal connector | Library:5050660822 | J10 |
| 1 | MAX17055 | Library:SON40P250X200X80-11N | U7 |
| 1 | MP2664 | Library:MPS_MP2664_QFN-10_2x2mm_P0.5mm | U4 |
| 1 | Nordic SWD | Library:PinHeader_1x03_P1.00mm_Vertical_1 | J8 |
| 1 | RP SWD | Library:PinHeader_1x03_P1.00mm_Vertical | J1 |
| 1 | RP USB | Library:PinHeader_1x03_P1.00mm_Vertical | J2 |
| 1 | RP2350A | Package_DFN_QFN:QFN-60-1EP_7x7mm_P0.4mm_EP3.4x3.4mm | U5 |
| 1 | TPS628438YKA | Library:Texas_DSBGA-6_0.757x1.01mm_Layout2x3_P0.35mm | U3 |
| 1 | USB | Library:CONN_505066-0622_MOL | J11 |
| 1 | W25Q64JWBYIM | Library:BGA-24_4x6_6.0x6.0mm | U2 |
| 1 | W25Q64JWUUIQ | Package_SON:Winbond_USON-8-2EP_3x4mm_P0.8mm_EP0.2x0.8mm | U1 |
| 1 | nRF52833_QDxx | Package_DFN_QFN:QFN-40-1EP_5x5mm_P0.4mm_EP3.6x3.6mm | U9 |
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Questions
How big is the Plajtime main PCB?
It measures 15.2 × 34 mm and has 6 copper layers, 1 mm thick.
What parts does the Plajtime main use?
85 parts, built around the RP2350A, TPS628438YKAR, W25Q64JWBYIM TR and W25Q64JWUUIQ. 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 Plajtime main KiCad files?
From the Plajta/PlajTime-Hardware repository on GitHub, at the commit this page was made from: the board is PCBs/plajtime-main/plajtime-main.kicad_pcb and its schematic PCBs/plajtime-aux/plajtime-aux.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Plajtime main design in my own project?
Its repository publishes it under the CC-BY-SA-4.0 licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).