4 layers202 × 125 mm
2 layers40 × 41 mm
Sx1255 eval
M17-Project/SX125510Evaluation board for the SX1255 RF transceiver chip
- Size
- 40 × 41 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 31
- Nets
- 39
- Pads
- 121
- Tracks, vias
- 160, 189
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 7 (file 20221018)
- Created
- 17 Dec 2023
- Updated
- 4 Jun 2025
Overview
Sx1255 eval is an open-source printed circuit board by M17-Project, from the M17-Project/SX1255 repository on GitHub. It is a 2-layer board of 40 × 41 mm with 31 parts on 39 nets, routed with 160 tracks and 189 vias.
It is built around the CRCW0603100RFKECC and C0603C103K5RAC7081. Its parts include 12 capacitors, 9 resistors, 5 connectors, 2 inductors and 1 IC. It belongs with the radio and wireless boards of this library.
Main components
2
CRCW0603100RFKECC
0603-55℃~+155℃ 100mW 100Ω Thick Film Resistor ±1% ±100ppm/℃ 0603 Chip Resistor - Surface Mount ROHSVishay IntertechnologyChip Resistor - Surface Mount
C0603C103K5RAC7081
060310nF 50V X7R ±10% 0603 Multilayer Ceramic Capacitors MLCC - SMD/SMT ROHSKEMETMultilayer Ceramic Capacitors MLCC - SMD/SMT
README
README.md
SX1255
Minimalistic evaluation board for the SX1255 RF transceiver chip, with PMOD connectors.
Clocking
Remember to provide a clock signal at the PMOD REF pin or EXT_REF SMA connector. The source is selectable with a jumper. A range of clock frequencies can be used, see the SX1255's documentation for details.
Raspberry Pi GPIO header connections
| PMOD pin name | RPi header pin number |
|---|---|
| VCC | 1 (3.3V) |
| OUT | 12 (GPIO18) |
| MOSI | 19 (SPI_MOSI) |
| MISO | 21 (SPI_MISO) |
| RST | 22 (GPIO25) |
| SCK | 23 (SPI_CLK) |
| /CS | 24 (SPI_CE0_N) |
| IO2 | 35 (GPIO19) |
| I_OUT | 38 (GPIO20) |
| GND | 39 (GND) |
| I_IN | 40 (GPIO21) |
Sample Raspberry Pi code for SX1255 control can be found here. I2S slave overlay is required.
License
This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.
Parts
31| Qty | Value | Footprint | References |
|---|---|---|---|
| 9 | 100R | Resistor_SMD:R_0603_1608Metric | R1, R2, R3, R4, R5, R6, R7, R8, R9 |
| 7 | 100n | Capacitor_SMD:C_0603_1608Metric | C4, C5, C6, C7, C8, C9, C12 |
| 3 | 10n | Capacitor_SMD:C_0603_1608Metric | C1, C2, C3 |
| 2 | PMOD | Connector_PinHeader_2.54mm:PinHeader_2x06_P2.54mm_Horizontal | J4, J5 |
| 1 | 27p | Capacitor_SMD:C_0603_1608Metric | C11 |
| 1 | 33p | Capacitor_SMD:C_0603_1608Metric | C10 |
| 1 | 39n | Inductor_SMD:L_0603_1608Metric | L2 |
| 1 | 82n | Inductor_SMD:L_0603_1608Metric | L1 |
| 1 | EXT_CLK_IN | Connector_Coaxial:SMA_Samtec_SMA-J-P-X-ST-EM1_EdgeMount | J1 |
| 1 | EXT_CLK_SRC | Connector_PinHeader_2.54mm:PinHeader_1x03_P2.54mm_Vertical | JP1 |
| 1 | RX_SMA | Connector_Coaxial:SMA_Samtec_SMA-J-P-X-ST-EM1_EdgeMount | J3 |
| 1 | SX1255 | Parts:QFN50P500X500X80-33N-D | IC1 |
| 1 | TX_SMA | Connector_Coaxial:SMA_Samtec_SMA-J-P-X-ST-EM1_EdgeMount | J2 |
The 30 most common of 31 parts.
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Questions
How big is the Sx1255 eval PCB?
It measures 40 × 41 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Sx1255 eval use?
31 parts, built around the CRCW0603100RFKECC and C0603C103K5RAC7081. 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 Sx1255 eval KiCad files?
From the M17-Project/SX1255 repository on GitHub, at the commit this page was made from: the board is sx1255_eval.kicad_pcb and its schematic sx1255_eval.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Sx1255 eval design in my own project?
Its repository states no licence, so its author keeps all rights: ask M17-Project before reusing the design.