2 layers31.5 × 19 mm
4 layers126.5 × 63 mm
- Size
- 126.5 × 63 mm
- Copper layers
- 4
- Thickness
- 1.6 mm
- Parts
- 174
- Nets
- 92
- Pads
- 573
- Tracks, vias
- 777, 146
- Pours
- 10
- Routed
- Yes
- KiCad
- KiCad 5 (file 20171130)
- Created
- 20 Jan 2020
- Updated
- 16 Feb 2021
Overview
Cmc is an open-source printed circuit board by STMBL, from the STMBL/stmbl-hw repository on GitHub. It is a 4-layer board of 126.5 × 63 mm with 174 parts on 92 nets, routed with 777 tracks and 146 vias.
It is built around the HX711, AM26LS31CD and USBLC6-4SC6. Its parts include 74 ICs, 43 capacitors, 38 resistors, 11 connectors and 1 inductor.
Main components
3
HX711
SOP-16-40℃~+85℃ 1.4mA 10Hz、80Hz 1MHz~20MHz、11.0592MHz 2 2.6V~5.5V 20mV、40mV、80mV 24 Built-in External、Built-in SPI Support Yes SOP-16 Analog to Digital Converters (ADC) ROHSAvia SemiconAnalog To Digital Converters (ADC)AM26LS31CD
SOIC-160 0℃~+70℃ 4 4.75V~5.25V Driver SOIC-16 RS-485 / RS-422 ICs ROHSTexas InstrumentsBuffers / Drivers
USBLC6-4SC6
SOT-23-6-55℃~+125℃ 0.3pF 15V 300W@8/20us 4.7A@8/20us 5V 6V 80nA ESD Four channels IEC 61000-4-2、IEC 61000-4-5、IEC 61000-4-4 Unidirectional SOT-23-6 ESD and Surge Protection (TVS/ESD) ROHSTECH PUBLICESD And Surge Protection (TVS/ESD)
Parts
174| Qty | Value | Footprint | References |
|---|---|---|---|
| 48 | non_plated | stmbl:non_plated_1mm | U24, U24, U24, U24, U24, U24, U24, U24, U24, U24, U24, U24, U24, U24, U24, U24 +32 |
| 30 | 100n | stmbl:C_0603 | C101, C103, C104, C106, C201, C202, C301, C302, C303, C304, C305, C308, C310, C312, C313, C316 +14 |
| 10 | 120 | stmbl:R_0603 | R303, R304, R307, R308, R309, R310, R313, R314, R315, R316 |
| 10 | 120 | stmbl:C_0603 | R403, R404, R405, R406, R407, R408, R409, R410, R412, R414 |
| 9 | CMC | stmbl:CMC_0805 | U201, U202, U205, U206, U301, U309, U310, U311, U312 |
| 8 | 10u | stmbl:C_0805 | C1, C2, C306, C307, C311, C314, C401, C406 |
| 7 | 1k | stmbl:R_0603 | R305, R306, R311, R312, R411, R413, R415 |
| 7 | Jumper_NO_Small | stmbl:0603_jumper | JP301, JP302, JP303, JP304, JP401, JP402, JP403 |
| 6 | sp485 | stmbl:SOIC-8-N | U302, U303, U304, U402, U403, U404 |
| 5 | RJ45_LED | stmbl:RJ45_LED | J102, J201, J202, J301, J401 |
| 4 | 560 | stmbl:R_0603 | R104, R105, R201, R202 |
| 4 | 560 | stmbl:C_0603 | R301, R302, R401, R402 |
| 4 | CONN_01X05 | stmbl:Pin_Header_RM2.54_1x5_UP | J302, J303, J304, J305 |
| 4 | USBLC6-4SC6 | stmbl:SOT-23-6 | U203, U204, U307, U308 |
| 3 | 3.9k | stmbl:R_0603 | R101, R102, R103 |
| 3 | LDO | stmbl:SOT-23-5 | U102, U306, U401 |
| 2 | 20pf | stmbl:C_0603 | C318, C323 |
| 2 | HX711 | stmbl:SOIC-16 | U313, U314 |
| 1 | 100p | stmbl:C_0603 | C309 |
| 1 | 1u | stmbl:C_0603 | C102 |
| 1 | 2.2u | stmbl:C_0603 | C315 |
| 1 | 20M | stmbl:Oscillator_SMD_0603_4Pads | U305 |
| 1 | CONN_01X07 | stmbl:Pin_Header_RM2.54_1x7_UP | J101 |
| 1 | CONN_02X06_Odd_Even | stmbl:Pin_Header_RM2.54_2x6_UP | J402 |
| 1 | INDUCTOR | stmbl:R_0603 | L301 |
| 1 | am26ls31 | stmbl:SOIC-16 | U101 |
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Questions
How big is the Cmc PCB?
It measures 126.5 × 63 mm and has 4 copper layers, 1.6 mm thick.
What parts does the Cmc use?
174 parts, built around the HX711, AM26LS31CD and USBLC6-4SC6. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
Where can I download the Cmc KiCad files?
From the STMBL/stmbl-hw repository on GitHub, at the commit this page was made from: the board is merge/cmc.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the Cmc design in my own project?
Its repository states no licence, so its author keeps all rights: ask STMBL before reusing the design.