LR1121
About the LR1121 PCB
LR1121 is an open source STM32 PCB design by WilliamSanchez, published on GitHub. It is a 4-layer board measuring 50 × 85 mm, with 68 components from 54 distinct parts.
Its main chip is the PCMF2HDMI2SZ, from the STM32 family. Other key parts include the KSZ9131RNXI, USB5744_2G, LTC4368IDD-2_PBF and AOZ2261AQI-15. By type, the board carries 28 capacitors, 19 resistors, 6 ICs, 3 antennas, 3 diodes and 3 inductors.
Main components on the LR1121
LR1121 bill of materials (BOM)
68 components, 54 distinct parts — part numbers from the project's BOM.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | KSZ9131RNXI LBAA0XV2GT | LBAA0XV2GT | U1 |
| 1 | PCMF2HDMI2SZ STM32L552CCUx | QFN-48-1EP_7x7mm_P0.5mm_EP5.6x5.6mm | U2 |
| 1 | USB5744_2G MT29F4G01ABAFDWB-IT:F TR | SON127P600X800X65-8N | U3 |
| 1 | LTC4368IDD-2_PBF PCMF1USB3S | WLCSP52-1-2_NEX | U4 |
| 1 | AOZ2261AQI-15 MAX-M10S | ublox_MAX | U5 |
| 1 | AOZ2261AQI-15 BQ25619ERTWR | BQ25619ERTWR | U7 |
| 1 | 25MHZ 32.768KHz | Crystal_SMD_3215-2Pin_3.2x1.5mm | Y1 |
| 1 | 25MHZ 25MHz | Crystal_SMD_3225-4Pin_3.2x2.5mm | Y2 |
| 1 | DF40C-80DP-0.4V_51_ USB_B_Micro | USB_Mini-B_Wuerth_65100516121_Horizontal | J1 |
| 1 | PinOUT | PinHeader_2x15_P2.54mm_Vertical | J2 |
| 1 | 2.4Gz | SMA_Molex_73251-1153_EdgeMount_Horizontal | AE1 |
| 1 | SUB-GHz | SMA_Molex_73251-1153_EdgeMount_Horizontal | AE2 |
| 1 | GPS | U.FL_Hirose_U.FL-R-SMT-1_Vertical | AE3 |
| 1 | NRST | SW_Push_1P1T_XKB_TS-1187A | SW1 |
| 1 | BOOT0 | SW_Push_1P1T_XKB_TS-1187A | SW2 |
| 1 | SMAJ30CA GREEN | LED_0402_1005Metric | D1 |
| 1 | RED | LED_0402_1005Metric | D2 |
| 1 | GREEN | LED_0402_1005Metric | D3 |
| 1 | 2.2UH_12A 27nH | L_0402_1005Metric | L1 |
| 1 | 1.5UH_16A 2.2uH | L_Taiyo-Yuden_MD-4040 | L2 |
Show 34 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | 2.2UH_4A 15uH | L_Taiyo-Yuden_MD-4040 | L3 |
| 2 | 16PF NU | C_0402_1005Metric | C1, C2 |
| 1 | 47UF NU | C_0402_1005Metric | C3 |
| 1 | 100NF NU | C_0402_1005Metric | C4 |
| 1 | 2.2NF 12pF | C_0402_1005Metric | C5 |
| 1 | 100NF 12pF | C_0402_1005Metric | C6 |
| 2 | 47UF 12pF | C_0402_1005Metric | C7, C8 |
| 1 | 47UF 10uF | C_0603_1608Metric | C9 |
| 3 | 100NF 100nF | C_0402_1005Metric | C10, C12, C18 |
| 5 | 10UF 100nF | C_0402_1005Metric | C11, C14, C15, C16, C20 |
| 1 | 1UF 2.2uF | CP_EIA-1608-08_AVX-J | C13 |
| 1 | 4.7UF 100nF | C_0402_1005Metric | C17 |
| 1 | 100NF 1uF | C_0402_1005Metric | C19 |
| 3 | 47UF 10uF | C_0805_2012Metric | C21, C22, C23 |
| 1 | 47UF 0.047uF | C_0402_1005Metric | C24 |
| 1 | 4.7UF 0.1uF | C_0402_1005Metric | C25 |
| 1 | 100NF 0.1uF | C_0402_1005Metric | C26 |
| 1 | 100NF 10uF | C_0805_2012Metric | C27 |
| 1 | 100NF 470nF | C_0402_1005Metric | C28 |
| 2 | 0 | R_0402_1005Metric | R1, R2 |
| 3 | 100K 10K | R_0402_1005Metric | R3, R9, R10 |
| 1 | 47K 100 | R_0402_1005Metric | R4 |
| 1 | 8.87K 100 | R_0402_1005Metric | R5 |
| 2 | 100K 100 | R_0402_1005Metric | R6, R7 |
| 1 | 510K 10K | R_0402_1005Metric | R8 |
| 1 | 787K 0.01 | R_2010_5025Metric | R11 |
| 1 | 80.6K 10K | R_0402_1005Metric | R12 |
| 1 | 18.2K 2.21K | R_0402_1005Metric | R13 |
| 1 | 80.6K 2.2K | R_0402_1005Metric | R14 |
| 1 | 0.01 10K | R_0402_1005Metric | R15 |
| 1 | 10K | R_0402_1005Metric | R16 |
| 1 | 100 10K | R_0402_1005Metric | R17 |
| 1 | 100K 2.21K | R_0402_1005Metric | R18 |
| 1 | 47K 0 | R_0402_1005Metric | R19 |
LR1121 design files
The KiCad project lives in the WilliamSanchez/Hardware repository on GitHub; these links point at the commit this page was built from.
LR1121: common questions
What microcontroller does the LR1121 use?
The LR1121 is built around the PCMF2HDMI2SZ, from the STM32 family.
How big is the LR1121 PCB?
The LR1121 measures 50 × 85 mm, has 4 copper layers and is 1.6 mm thick.
How many components are on the LR1121?
68 components, from 54 distinct parts, with part numbers taken from the project's own BOM. The full bill of materials is listed on this page.
Where can I download the LR1121 design files?
From the WilliamSanchez/Hardware repository on GitHub, which has the KiCad layout, the schematic and the BOM; the links under Design files point to each one.
Can I use the LR1121 design in my own project?
The repository has no license, so all rights stay with WilliamSanchez. Use it as a reference, and ask the author before reusing the design.
Can I test firmware for the LR1121 without the hardware?
Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug STM32 firmware against it before you order a PCB.
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