2 layers16 × 25 mm
2 layers87.6 × 25.4 mm
Lis3dh board
explora26/tablet_sensor_board- Size
- 87.6 × 25.4 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 25
- Nets
- 25
- Pads
- 82
- Tracks, vias
- 139, 80
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 10.0 (file 20260206)
- Created
- 17 Oct 2026
- Updated
- 19 Oct 2026
Overview
Lis3dh board is an open-source printed circuit board by explora26, from the explora26/tablet_sensor_board repository on GitHub. It is a 2-layer board of 87.6 × 25.4 mm with 25 parts on 25 nets, routed with 139 tracks and 80 vias.
It is built around the LIS3DH, TLV75530PDBV and BSS138. Its parts include 8 capacitors, 8 resistors, 4 connectors, 2 ICs and 1 transistor.
Main components
3
LIS3DH
LGA-16(3x3)-40℃~+85℃ 1.71V~3.6V 16bit 500nA Accelerometer Motion event detection SPI、I2C X,Y,Z ±16g LGA-16(3x3) Accelerometers ROHSSTMicroelectronicsAccelerometers
TLV75530PDBV
SOT-23-5-40℃~+125℃@(Tj) 1 238mV@(500mA) 25uA 3V 46dB@(100kHz) 5.5V 500mA Fixed Over Current Protection、Short Circuit Protection、Thermal shutdown、Enable control、Input under-voltage protection、Output discharge、Built-in soft-start Positive SOT-23-5 Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSTexas InstrumentsVoltage Regulators - Linear, Low Drop Out (LDO) Regulators
BSS138
SOT-23-55℃~+150℃ 1 N-channel 1.1Ω@10V、1.2Ω@4.5V 1.2V 1.7nC@10V 17.5pF 340mA 350mW 50V 6.5pF N-Channel SOT-23 MOSFETs ROHShongjiachengMOSFETs
README
power_button/README.md平板電源鍵小板
KRHRO K6-6277D-02 直角 LED 輕觸開關（紅光）、LED 限流電阻、JST PH 2.0 4P 接頭和一個 M3 鎖孔。
狀態：原理圖、layout、3D 模型完成（16 × 25 mm，雙層板）；KiCad 10 ERC / DRC 無錯誤。
J1（JST PH 2.0，4P）
| J1 | 訊號 | 說明 |
|---|---|---|
| 1 | VCC | 5V，LED 電源（經 R1 1k 到 LED 正極） |
| 2 | SW | 按下時接到 GND；上拉電阻放在主板 |
| 3 | LED_CTRL | LED 負極；主板拉到 GND 時 LED 亮 |
| 4 | GND |
- LED 電流：(5V − 紅光約 2V) / 1k ≈ 3 mA
- LED_CTRL 會被 LED 拉到接近 5V − Vf，不可直接接 3V GPIO；主板請用 NPN / N-MOSFET 或開汲極輸出控制，要常亮就直接接 GND
- 開關額定 DC 30V 0.3A
機構重點
- 按鍵中心離板面 3.80 mm，按鍵帽 Ø8.30 × 2.50 mm，帽子底部比板面低 0.35 mm，所以按鍵帽必須伸出板邊
- 板子下緣在第 4 腳往前 4.58 mm（本體前緣附近），頸部和按鍵帽伸出板外；按鍵帽後緣在第 4 腳往前 6.7 mm、帽面 9.2 mm
- 本體外框：寬 7.6 mm，第 4 腳往後 4.05 mm 到往前 4.7 mm，高 7.4 mm
- H1：M3 鎖孔（3.2 mm，不鍍銅）
3d/power_button_board.step：整片板子含零件的 STEP，可直接匯入機構軟體3d/KRHRO_K6-6277D.step：開關的簡化模型（依 KRHRO 圖面尺寸建立，外形包絡正確，內部細節省略）
檔案
power_button.kicad_pro / .kicad_sch / .kicad_pcb：KiCad 專案；fp-lib-table指到專案內的power_button.prettypower_button.pretty/KRHRO_K6-6277D.kicad_mod：開關封裝（依圖面 PCB Layout 繪製，已掛 3D 模型）fab/power_button_gerbers.zip、fab/positions.csv、fab/bom.csv：製造檔docs/schematic.pdf、docs/pcb_3d_top.png、docs/pcb_3d_iso.pngscripts/gen_sch.py、scripts/gen_pcb.py、scripts/gen_3d.py：產生原理圖、PCB（Freerouting 佈線）和 3D 模型的腳本
Parts
25| Qty | Value | Footprint | References |
|---|---|---|---|
| 3 | 1000uF 10V | Capacitor_SMD:CP_Elec_8x10.5 | C5, C7, C8 |
| 3 | 10k | Resistor_SMD:R_0603_1608Metric | R4, R5, R7 |
| 2 | 100nF | Capacitor_SMD:C_0603_1608Metric | C3, C6 |
| 2 | 1R | Resistor_SMD:R_0805_2012Metric | R8, R9 |
| 2 | 1uF | Capacitor_SMD:C_0603_1608Metric | C1, C2 |
| 2 | 4.7k | Resistor_SMD:R_0603_1608Metric | R1, R2 |
| 2 | M3 | MountingHole:MountingHole_3.2mm_M3 | H1, H2 |
| 1 | 10uF | Capacitor_SMD:C_0603_1608Metric | C4 |
| 1 | 4.7R | Resistor_SMD:R_0805_2012Metric | R6 |
| 1 | BQ25798_BOARD | Connector_JST:JST_PH_B5B-PH-K_1x05_P2.00mm_Vertical | J2 |
| 1 | BSS138 | Package_TO_SOT_SMD:SOT-23 | Q1 |
| 1 | LIS3DH | Package_LGA:LGA-16_3x3mm_P0.5mm_LayoutBorder3x5y | U2 |
| 1 | RFID_ANT | Connector_Molex:Molex_PicoBlade_53047-0210_1x02_P1.25mm_Vertical | J4 |
| 1 | T4_IF | Connector_PinHeader_2.54mm:PinHeader_1x07_P2.54mm_Vertical | J1 |
| 1 | TLV75530PDBV | Package_TO_SOT_SMD:SOT-23-5 | U1 |
| 1 | WL-125 | Connector_PinSocket_2.54mm:PinSocket_1x10_P2.54mm_Vertical | J3 |
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Questions
How big is the Lis3dh board PCB?
It measures 87.6 × 25.4 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Lis3dh board use?
25 parts, built around the LIS3DH, TLV75530PDBV and BSS138. 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 Lis3dh board KiCad files?
From the explora26/tablet_sensor_board repository on GitHub, at the commit this page was made from: the board is lis3dh_board.kicad_pcb and its schematic lis3dh_board.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Lis3dh board design in my own project?
Its repository states no licence, so its author keeps all rights: ask explora26 before reusing the design.