Crystal
About the Crystal PCB
Crystal is an open source STM32 PCB design by Kreyl, published on GitHub. It is a 2-layer board measuring 77 × 77 mm, with 71 components from 29 distinct parts.
Its main chip is the STM32F100C4, from the STM32 family. By type, the board carries 22 capacitors, 18 resistors, 5 transistors, 3 switches, 3 test points and 3 inductors.
Crystal bill of materials (BOM)
71 components, 29 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 4 | LED_5050 | LED_5050 | Q1, Q2, Q3, Q4 |
| 1 | 2N7002 | SOT23-3 | Q5 |
| 1 | ANT_PCB_MONO_2PIN | Locket5_MIRR | ANT1 |
| 1 | 0896BM15A0001E BALUN868JOHANSON | BALUN_JOHANSON868 | BLN1 |
| 1 | MCP1700T-3302E/TT MCP1700 | SOT23-3A | DA1 |
| 1 | CC1101 | QFN20 | DD1 |
| 1 | STM32F100C4 | LQFP48 | DD2 |
| 3 | HOLE_METALLED | Hole2d4_out4d4mm | HOLE1, HOLE2, HOLE3 |
| 4 | REFPOINT | REF_POINT_1MM | RP1, RP2, RP3, RP4 |
| 1 | SS9 | SW_SS9 | SA1 |
| 3 | IT1198 | BTN_IT1198 | SW1, SW2, SW3 |
| 3 | TESTPOINT | TESTPOINT_1MM | TP1, TP2, TP3 |
| 1 | CONN_6 | PLS-6_LOCK | XL1 |
| 1 | CONN_1 | PLS-1Square | XL2 |
| 1 | CONN_2 | SLD_2_2D5 | XL3 |
| 1 | 27MHz | 03225C4 | XTAL1 |
| 1 | - * | IND_0402 | L1 |
| 2 | - BLM15AG102SN1 | IND_0402 | L2, L3 |
| 1 | - 100pF - | CAP_0402 | C1 |
| 2 | - * - | CAP_0402 | C2, C3 |
Show 9 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 2 | - 18pF - | CAP_0603_Silks | C4, C5 |
| 11 | - 0.1u - | CAP_0603_Silks | C6, C8, C9, C10, C11, C12, C13, C15 +3 |
| 4 | - 1u - | CAP_0603_Silks | C7, C19, C21, C22 |
| 1 | - 10u - | CAP_0603_Silks | C14 |
| 1 | - 10n - | CAP_0603_Silks | C20 |
| 2 | - 56k | RES_0603 | R1, R3 |
| 1 | - 10k | RES_0603 | R2 |
| 12 | - 1k | RES_0603 | R4, R5, R6, R7, R8, R9, R10, R11 +4 |
| 3 | - 100k | RES_0603 | R16, R17, R18 |
Crystal design files
The KiCad project lives in the Kreyl/Crystal repository on GitHub; these links point at the commit this page was built from.
- LayoutCrystal_hw/Crystal.kicad_pcb
- SchematicCrystal_hw/Crystal.kicad_sch
Crystal: common questions
What microcontroller does the Crystal use?
The Crystal is built around the STM32F100C4, from the STM32 family.
How big is the Crystal PCB?
The Crystal measures 77 × 77 mm, has 2 copper layers and is 1.456 mm thick.
How many components are on the Crystal?
71 components, from 29 distinct parts. The full bill of materials is listed on this page.
Where can I download the Crystal design files?
From the Kreyl/Crystal repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.
Can I use the Crystal design in my own project?
The repository has no license, so all rights stay with Kreyl. Use it as a reference, and ask the author before reusing the design.
Can I test firmware for the Crystal 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.
Similar boards
STM32LumenPnP Motherboard
opulo-inc
149 × 95 mm296 parts4LCC-BY-SA-4.03.7k
STM32AxxSolder
AxxAxx
39 × 82.5 mm122 parts2LGPL-3.01.7k
STM32LibreVNA
jankae
122 × 98 mm592 parts6LGPL-3.01.6k
STM32AIOC
skuep
21 × 31.5 mm47 parts2LMIT1.4k
STM32Ferris
pierrechevalier83
208.8 × 86.8 mm102 parts2LSHL-2.11.3k
STM32176 pin board
rusefi
61.8 × 73.2 mm76 parts2LGPL-3.01.2k