Cdm324 v2
About the Cdm324 v2 PCB
Cdm324 v2 is an open source STM32 PCB design by limpkin, published on GitHub under the MIT license. It is a 2-layer board measuring 32 × 32.5 mm, with 37 components from 17 distinct parts.
Its main chip is the STM32F301K8U6, from the STM32 family. Other key parts include the LMP7731MF/NOPB, MAX9814ETD+T, NCP163ASN330T1G and PCA8561AHN/AY. By type, the board carries 17 capacitors, 10 resistors, 6 ICs, 3 connectors and 1 inductor.
From the project
Repository for the CDM324 backpack v2
In the unlikely case you want to reflash your device with another firmware, you may either use the GUI present in this repository or the stm32loader python module directly :
If you don't have the companion expansion board, you may use STM32 Flash loader after performing the following toggling sequence: - tie nRESET to GND - bring BOOT0 to 3V3_OUT - release nRESET - releae BOOT0
Main components on the Cdm324 v2
Cdm324 v2 bill of materials (BOM)
37 components, 17 distinct parts — part numbers from the project's BOM.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | LMP7731MF/NOPB LMP7731 Texas Instruments | SOT-23-5 | U1 |
| 1 | ~ | TN_DISPLAY | U2 |
| 1 | MAX9814ETD+T MAX9814 Analog Devices Inc./Maxim Integrated | DFN-14-1EP_3x3mm_P0.4mm_EP1.78x2.35mm | U3 |
| 1 | NCP163ASN330T1G onsemi | SOT-23-5 | U4 |
| 1 | STM32F301K8U6 STM32F301K8Ux STMicroelectronics | QFN-32-1EP_5x5mm_P0.5mm_EP3.45x3.45mm | U5 |
| 1 | PCA8561AHN/AY ~ NXP USA Inc. | QFN-32-1EP_5x5mm_P0.5mm_EP3.65x3.65mm | U6 |
| 1 | PPPC031LFBN-RC Conn_01x03_Female Sullins Connector Solutions | PinHeader_1x03_P2.54mm_Vertical | J2 |
| 2 | PPPC042LFBN-RC Conn_02x04_Odd_Even Sullins Connector Solutions | PinSocket_2x04_P2.54mm_Vertical | J4, J5 |
| 1 | HZ0805D102R-10 Ferrite_Bead Laird-Signal Integrity Products | L_0805_2012Metric | FB1 |
| 6 | CL21A226MOCLRNC 22uF Samsung Electro-Mechanics | C_0805_2012Metric | C1, C3, C5, C10, C11, C13 |
| 9 | C1005X5R1E474K050BB 470nF TDK Corporation | C_0402_1005Metric | C2, C6, C7, C8, C12, C14, C15, C16 +1 |
| 1 | CC0603JRNPO9BN270 200p YAGEO | C_0603_1608Metric | C4 |
| 1 | GRM188R71A225KE15D 2.2uF Murata Electronics | C_0603_1608Metric | C9 |
| 5 | RC0603FR-074K7L 4k7 YAGEO | R_0603_1608Metric | R1, R4, R8, R9, R10 |
| 2 | RC0402JR-0775RL 75 YAGEO | R_0402_1005Metric | R2, R7 |
| 1 | RC0603FR-07620KL 130k YAGEO | R_0603_1608Metric | R3 |
| 2 | ERJ-3EKF1303V 130k Panasonic Electronic Components | R_0603_1608Metric | R5, R6 |
Cdm324 v2 design files
The KiCad project lives in the limpkin/cdm324_fft repository on GitHub; these links point at the commit this page was built from.
Cdm324 v2: common questions
What microcontroller does the Cdm324 v2 use?
The Cdm324 v2 is built around the STM32F301K8U6, from the STM32 family.
How big is the Cdm324 v2 PCB?
The Cdm324 v2 measures 32 × 32.5 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the Cdm324 v2?
37 components, from 17 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 Cdm324 v2 design files?
From the limpkin/cdm324_fft 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 Cdm324 v2 design in my own project?
Yes, under the terms of its MIT license, which limpkin chose for the repository.
Can I test firmware for the Cdm324 v2 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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