Gk
About the Gk PCB
Gk is an open source STM32 PCB design by jncronin, published on GitHub. It is a 6-layer board measuring 120.7 × 110 mm, with 245 components from 73 distinct parts.
Its main chip is the STM32MP255DAI3, from the STM32 family. Other key parts include the STPMIC25B JC Module, BQ24075RGT (_not_ BQ24075*T*RGT), MAX17048, INA236[AB]IDDFR and IS43LQ32256A-062BLI. By type, the board carries 127 capacitors, 59 resistors, 19 ICs, 14 connectors, 13 test points and 4 switches.
It belongs with the power & battery designs in this gallery.
From the project
This directory contains PDF schematics, KiCAD projects and Gerbers for the gkv4 PCBs.
This directory contains PDF schematics, KiCAD projects and Gerbers for the gkv4 PCBs.
- gk: This is the main board for the gkv4 and includes the high speed components. It is implemented as a 6 layer board with impedance control requirements specified in the PCBnew file. - pmic: This is a standalone 1 inch square board that contains the STPMIC25 power management chip and associated passive components. It is implemented as a 4 layer board and additionally provided as a panelized board. It is mounted using LGA/castellated holes onto the main board. - controls: This is a daughter board…
Main components on the Gk
Gk bill of materials (BOM)
245 components, 73 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | STPMIC25B JC Module | jc_pmic | U1 |
| 1 | BQ24075RGT (_not_ BQ24075*T*RGT) | VQFN-16-1EP_3x3mm_P0.5mm_EP1.6x1.6mm | U2 |
| 1 | MAX17048 | TDFN-8-1EP_2x2mm_P0.5mm_EP0.8x1.2mm | U3 |
| 1 | INA236[AB]IDDFR | SOT-23-8 | U4 |
| 1 | STM32MP255DAI3 | TFBGA436_STM | U5 |
| 1 | IS43LQ32256A-062BLI | BGA-200_10x14.5mm_Layout12x22_P0.8x0.65mm | U6 |
| 1 | W25Q32JVSN or MX25L6433F | SOIC-8_3.9x4.9mm_P1.27mm | U7 |
| 1 | TPS2051CDBV | SOT-23-5 | U8 |
| 1 | TLV61070ADBV | SOT-23-6 | U9 |
| 2 | WE-TVS-82400102 | SOT-23-6 | U10, U11 |
| 1 | TPS61165DBV | SOT-23-6 | U12 |
| 1 | SN74AVC32T245NMJR | NMJ0096A-IPC_A | U13 |
| 1 | TPS2051BDBV | SOT-23-5 | U14 |
| 1 | LSM6DSL | LGA-14_3x2.5mm_P0.5mm_LayoutBorder3x4y | U15 |
| 1 | TAD5112 | TAD5112 | U16 |
| 1 | PAM8302AAS | MSOP-8_3x3mm_P0.65mm | U17 |
| 1 | LIS2MDL | LGA-12_2x2mm_P0.5mm | U18 |
| 1 | BQ25601 | Texas_RTW_WQFN-24-1EP_4x4mm_P0.5mm_EP2.7x2.7mm_ThermalVias | U19 |
| 1 | 40MHz | Crystal_SMD_SeikoEpson_TSX3225-4Pin_3.2x2.5mm | Y1 |
| 1 | CM8V-T1A-32.768kHz-12.5pF-20PPM-TA-QC | Crystal_SMD_2012-2Pin_2.0x1.2mm | Y2 |
Show 53 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | Conn_01x02 | JST_XH_S2B-XH-A_1x02_P2.50mm_Horizontal | J1 |
| 1 | Conn_01x02 | JST_PH_S2B-PH-K_1x02_P2.00mm_Horizontal | J2 |
| 1 | Bus_M.2_Socket_E | AMPHENOL_MDT275E01001 | J3 |
| 1 | Micro_SD_Card_Det2 | microSD_HC_Molex_104031-0811 | J4 |
| 1 | Conn_ARM_Cortex_Debug_ETM_20 | PinHeader_2x10_P1.27mm_Vertical_SMD | J5 |
| 1 | USB_A | USB_A_Molex_67643_Horizontal | J6 |
| 1 | USB_C_Receptacle_USB2.0 | USB_C_Receptacle_HRO_TYPE-C-31-M-12 | J7 |
| 1 | Conn_01x40 | TE_4-1734839-0_1x40-1MP_P0.5mm_Horizontal | J8 |
| 1 | Conn_01x06 | TE_0-1734839-6_1x06-1MP_P0.5mm_Horizontal | J9 |
| 1 | Conn_ARM_JTAG_SWD_10 | PinHeader_2x05_P1.27mm_Vertical_SMD | J10 |
| 1 | Conn_01x20 | PinHeader_2x10_P1.27mm_Vertical_SMD | J11 |
| 1 | AudioJack3_SwitchTR | Jack_3.5mm_Ledino_KB3SPRS_Horizontal | J12 |
| 1 | Conn_01x02 | Molex_PicoBlade_53048-0210_1x02_P1.25mm_Horizontal | J13 |
| 1 | Conn_01x03 | PinHeader_1x04_P2.54mm_Vertical | J14 |
| 2 | SW_Push | SW_SPST_PTS647_Sx38 | SW1, SW2 |
| 2 | SW_Push | TouchButton-8x8mm_2 | SW_R1, SW_R2 |
| 13 | TestPoint | PinHeader_1x01_P2.54mm_Vertical | TP1, TP2, TP3, TP4, TP5, TP6, TP7, TP8 +5 |
| 3 | SW_Push | SW_Tactile_SKHH_Angled | SW_ONOFF1, SW_VOLDOWN1, SW_VOLUP1 |
| 1 | D_Schottky | D_SOD-128 | D2 |
| 1 | 2.2u XAL4020-222ME | L_Coilcraft_XAL4020-XXX | L1 |
| 1 | 10u/150mOhm/500mA WLPN404018M100LE | L_Coilcraft_XAL4040-XXX | L2 |
| 1 | DFE252012F-1R0M=P2 / 1u | L_1008_2520Metric | L6 |
| 4 | 22u/6.3V | C_0603_1608Metric | C1, C2, C3, C4 |
| 2 | 22u/10V | C_0805_2012Metric | C5, C6 |
| 3 | 4.7u | C_0805_2012Metric | C7, C8, C25 |
| 18 | 100n | C_0603_1608Metric | C9, C10, C15, C19, C20, C36, C37, C98 +10 |
| 1 | 4.7u | C_0402_1005Metric | C11 |
| 2 | 2.2u | C_0402_1005Metric | C12, C62 |
| 25 | 1u | C_0402_1005Metric | C13, C14, C16, C17, C26, C27, C29, C30 +17 |
| 2 | 220n | C_0603_1608Metric | C18, C111 |
| 12 | 10u | C_0805_2012Metric | C21, C24, C94, C95, C100, C106, C121, C123 +4 |
| 1 | 47n | C_0603_1608Metric | C22 |
| 37 | 100n | C_0402_1005Metric | C23, C49, C51, C54, C55, C56, C57, C58 +29 |
| 5 | 10n | C_0603_1608Metric | C28, C117, C118, C119, C120 |
| 5 | 1u | C_0805_2012Metric | C96, C97, C129, C130, C132 |
| 4 | 15p | C_0603_1608Metric | C101, C102, C103, C104 |
| 1 | 175p | C_0603_1608Metric | C107 |
| 1 | 22u | C_0805_2012Metric | C108 |
| 1 | 1u/50V | C_0805_2012Metric | C109 |
| 1 | 4.7u/10V | C_0805_2012Metric | C110 |
| 2 | 0.1u | C_0603_1608Metric | C133, C134 |
| 1 | NC (v1) / 5.23k (v2) | R_0603_1608Metric | R1 |
| 24 | 10k | R_0603_1608Metric | R2, R3, R4, R5, R14, R18, R19, R22 +16 |
| 1 | NC/10k (v1) / 30.1k (v2 with NTC) / 7.5k (v2 without NTC) | R_0603_1608Metric | R6 |
| 9 | 1.5k | R_0603_1608Metric | R10, R30, R31, R32, R33, R34, R35, R36 +1 |
| 2 | 1k | R_0603_1608Metric | R11, R45 |
| 1 | 10m | R_1206_3216Metric | R12 |
| 2 | 200R | R_0603_1608Metric | R13, R41 |
| 2 | 240R | R_0603_1608Metric | R15, R38 |
| 13 | 100k | R_0603_1608Metric | R16, R17, R20, R21, R24, R25, R26, R27 +5 |
| 1 | 910k | R_0603_1608Metric | R47 |
| 2 | 5.1k | R_0603_1608Metric | R50, R51 |
| 1 | 4R/500mW | R_2512_6332Metric | R54 |
Gk design files
The KiCad project lives in the jncronin/gk repository on GitHub; these links point at the commit this page was built from.
- Layoutgk-pcbv4/gk/gk.kicad_pcb
- Schematicgk-pcbv4/gk/gk.kicad_sch
Gk: common questions
What microcontroller does the Gk use?
The Gk is built around the STM32MP255DAI3, from the STM32 family.
How big is the Gk PCB?
The Gk measures 120.7 × 110 mm, has 6 copper layers and is 1.5584 mm thick.
How many components are on the Gk?
245 components, from 73 distinct parts. The full bill of materials is listed on this page.
Where can I download the Gk design files?
From the jncronin/gk repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.
Can I use the Gk design in my own project?
The repository has no license, so all rights stay with jncronin. Use it as a reference, and ask the author before reusing the design.
Can I test firmware for the Gk 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.
More boards in gk
STM32Gk pcbv3
108 × 158.8 mm276 parts6LNo license78
Gk controls
120.7 × 72.2 mm103 parts2LNo license78
Pmic panel
96.2 × 75.8 mm52 parts4LNo license78
Pmic
25.4 × 25.4 mm52 parts4LNo license78
Gk oled
50.7 × 52 mm44 parts4LNo license78
Gk controls trigger
60 × 38.2 mm7 parts2LNo license78
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