Lboard2
About the Lboard2 PCB
Lboard2 is an open source STM32 PCB design by electrodyssey, published on GitHub under the LGPL-3.0 license. It is a 4-layer board measuring 203.2 × 101.6 mm, with 214 components from 74 distinct parts.
Its main chip is the STM32F401RBTx, from the STM32 family. Other key parts include the CDCE913PW, M25P16-VME, USBLC6-2SC6, NCP1117-3.3_SOT223 and AMS1117-ADJ. By type, the board carries 106 capacitors, 51 resistors, 14 ICs, 5 crystals, 5 LEDs and 4 inductors.
From the project
experimental Spartan-6 sound processing board with XC6SLX9-TQG144 and TLV320AIC3204
experimental sound processing board with XC6SLX9-TQG144 and TLV320AIC3204
Currently board is capable of receiving and sending the audio samples with a codec and passes the loopback test from FPGA pins.
FPGA bitstream config is stored inside the STM32F401RE internal flash.
Quick and dirty firmware loader is here: https://github.com/electrodyssey/lboard2flashboot
Main components on the Lboard2
Lboard2 bill of materials (BOM)
214 components, 74 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | CDCE913PW | TSSOP-14_4.4x5mm_Pitch0.65mm | U1 |
| 1 | STM32F401RBTx | LQFP-64_10x10mm_Pitch0.5mm | U2 |
| 2 | M25P16-VME | SOIC-8_3.9x4.9mm_Pitch1.27mm | U3, U11 |
| 1 | USBLC6-2SC6 | SOT-23-6 | U4 |
| 1 | NCP1117-3.3_SOT223 | SOT-223-3_TabPin2 | U5 |
| 1 | AMS1117-ADJ | SOT-223-3_TabPin2 | U6 |
| 1 | AMS1117-33 | SOT-223-3_TabPin2 | U7 |
| 1 | L5973D | SOIC-8-1EP_3.9x4.9mm_Pitch1.27mm | U8 |
| 1 | XC6SLX9-TQG144 | LQFP-144_20x20mm_Pitch0.5mm | U9 |
| 1 | AS7C34098A | tsop2-44 | U10 |
| 1 | FT232RL | SSOP-28_5.3x10.2mm_Pitch0.65mm | U12 |
| 1 | TLV320AIC3204 | QFN-32-1EP_5x5mm_Pitch0.5mm | U13 |
| 1 | AMS1117-1.8 | SOT-223-3_TabPin2 | U14 |
| 1 | 27MHz | Crystal_HC49-4H_Vertical | Y1 |
| 1 | 8MHz | Crystal_SMD_HC49-SD_HandSoldering | Y2 |
| 1 | DNP | Crystal_HC49-U_Vertical | Y3 |
| 1 | ABS25-32.768KHZ-6-T | Crystal_SMD_SeikoEpson_MC306-4pin_8.0x3.2mm_HandSoldering | Y4 |
| 1 | DNP32 | Crystal_DS10_d1.0mm_l4.3mm_Vertical | Y5 |
| 1 | Conn_01x04 | ATX-PSU-MOLEX-4PIN-5.08mm | J2 |
| 1 | PSU_SYNC | Pin_Header_Straight_1x01_Pitch2.54mm | J3 |
Show 54 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | PSU_REF | Pin_Header_Straight_1x01_Pitch2.54mm | J4 |
| 2 | Jumper_NC_Dual | Pin_Header_Straight_1x03_Pitch2.54mm | JP1, JP2 |
| 5 | Audio-Jack-3 | audiosock-3.5-3pin | J_AIN_LINE1, J_AIN_LINE2, J_AIN_MIC1, J_AOUT_HP1, J_AOUT_LINE1 |
| 1 | Conn_01x07_Male | Pin_Header_Straight_1x07_Pitch2.54mm | J_CBUS_DBG1 |
| 1 | Barrel_Jack | BARREL_JACK | J_DC_BARREL1 |
| 1 | Conn_02x07_Odd_Even | IDC_Header_Straight_14pins | J_FPGA_JTAG1 |
| 1 | Conn_01x04 | Pin_Header_Straight_1x04_Pitch2.54mm | J_I2C_CLK_DBG1 |
| 2 | Conn_02x10_Odd_Even | IDC_Header_Straight_20pins | J_MCU_JTAG1, J_X3 |
| 2 | Conn_01x05 | Pin_Header_Straight_1x05_Pitch2.54mm | J_SPIFLASHF_DBG2, J_SPIFLASH_DBG1 |
| 2 | TEST_2P | Pin_Header_Straight_1x02_Pitch2.54mm | J_TGND1, J_TGND2 |
| 1 | Conn_01x03 | Pin_Header_Straight_1x03_Pitch2.54mm | J_UART1_DBG1 |
| 2 | USB_B | USB_B | J_USBMCU1, J_USB_FPGA1 |
| 2 | Conn_02x08_Odd_Even | IDC_Header_Straight_16pins | J_X0, J_X2 |
| 1 | SW_Push | SW_SPST_EVQPE1 | SW_RESET1 |
| 5 | LED | LED_0805_HandSoldering | D_USB_UART_RX1, D_USB_UART_TX1, LED_MCU1, LED_MCU2, LED_PSU_5V1 |
| 1 | DFLS1100-7 | D_PowerDI-123 | D1 |
| 1 | D_Schottky | D_SMB | D2 |
| 1 | LED | LED_0805_HandSoldering | D3 |
| 3 | Ferrite_Bead | Choke_SMD_1206_Handsoldering | L1, L2, L4 |
| 1 | 15uH | Choke_SMD_12x12mm_h8mm | L3 |
| 23 | 1uF | C_0805_HandSoldering | C1, C3, C6, C13, C16, C18, C22, C37 +15 |
| 40 | 0.1 | C_0805_HandSoldering | C2, C4, C5, C7, C9, C17, C19, C20 +32 |
| 2 | 20pF | C_0805_HandSoldering | C8, C10 |
| 2 | 2.2uF | C_0805_HandSoldering | C11, C14 |
| 2 | 4.3pF | C_0805_HandSoldering | C12, C15 |
| 1 | 220pF | C_0805_HandSoldering | C24 |
| 1 | 22nF | C_0805_HandSoldering | C25 |
| 1 | 10uF x 25v | C_1210_HandSoldering | C26 |
| 1 | 330uF | CP_Tantalum_Case-D_EIA-7343-31_Hand | C27 |
| 11 | 10uF | C_0805_HandSoldering | C30, C31, C32, C33, C85, C86, C87, C88 +3 |
| 6 | 1uF | R_0805_HandSoldering | C34, C36, C39, C42, C45, C93 |
| 6 | 0.1 | R_0805_HandSoldering | C35, C38, C41, C43, C46, C94 |
| 2 | DNP | C_0805_HandSoldering | C71, C77 |
| 2 | 47nF | C_0805_HandSoldering | C72, C78 |
| 4 | 0.47uF | C_0805_HandSoldering | C73, C74, C79, C80 |
| 2 | 47uF | C_1206_HandSoldering | C75, C76 |
| 13 | 10k | R_0805_HandSoldering | R1, R2, R3, R4, R5, R8, R9, R22 +5 |
| 1 | 10k DNP | R_0805_HandSoldering | R6 |
| 1 | DNP | R_0805_HandSoldering | R7 |
| 2 | 120 | R_0805_HandSoldering | R10, R44 |
| 1 | 47k | R_0805_HandSoldering | R11 |
| 1 | 68k | R_0805_HandSoldering | R12 |
| 1 | 390 | R_0805_HandSoldering | R13 |
| 3 | 4.7k | R_0805_HandSoldering | R14, R35, R43 |
| 1 | 12k | R_0805_HandSoldering | R15 |
| 1 | 3.9k | R_0805_HandSoldering | R16 |
| 1 | 220 | R_0805_HandSoldering | R17 |
| 4 | 100 | R_0805_HandSoldering | R18, R19, R31, R33 |
| 3 | 4k7 | R_0805_HandSoldering | R20, R24, R28 |
| 4 | 330 | R_0805_HandSoldering | R21, R27, R29, R30 |
| 2 | 2.7k | R_0805_HandSoldering | R32, R34 |
| 6 | 27 | R_0805_HandSoldering | R36, R37, R38, R39, R40, R41 |
| 3 | 10 | R_0805_HandSoldering | R42, R45, R51 |
| 3 | 18 | R_0805_HandSoldering | R46, R47, R48 |
Lboard2 design files
The KiCad project lives in the electrodyssey/lboard2 repository on GitHub; these links point at the commit this page was built from.
- Layoutlboard2.kicad_pcb
Lboard2: common questions
What microcontroller does the Lboard2 use?
The Lboard2 is built around the STM32F401RBTx, from the STM32 family.
How big is the Lboard2 PCB?
The Lboard2 measures 203.2 × 101.6 mm, has 4 copper layers and is 1.6 mm thick.
How many components are on the Lboard2?
214 components, from 74 distinct parts. The full bill of materials is listed on this page.
Where can I download the Lboard2 design files?
From the electrodyssey/lboard2 repository on GitHub, which has the KiCad layout; the links under Design files point to each one.
Can I use the Lboard2 design in my own project?
Yes, under the terms of its LGPL-3.0 license, which electrodyssey chose for the repository.
Can I test firmware for the Lboard2 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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