6 layers54.6 × 57.1 mm
CM5 MINIMA 2
piecol/CM5_MINIMA_REV2
Compact, feature-filled CM5 carrier board
102 parts170CERN-OHL-S-2.0
2 layers93.9 × 83.8 mm
Backplane
dbrgn/ic880a-backplane15Backplane to connect an iC880A-SPI concentrator board to a Raspberry Pi, with protection against reversed power supply and voltage spikes, a temperature / humidity sensor, a step-down voltage regulator, an ADC to measure supply voltage, a general purpose button, three general purpose LEDs and a connector for a 5V DC fan.
- Size
- 93.9 × 83.8 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 72
- Nets
- 31
- Pads
- 201
- Tracks, vias
- 353, 11
- Pours
- 4
- Routed
- Yes
- KiCad
- KiCad 5 (file 20171130)
- Created
- 4 Feb 2017
- Updated
- 2 Sep 2019
Overview
Backplane is an open-source printed circuit board by dbrgn, from the dbrgn/ic880a-backplane repository on GitHub. It is a 2-layer board of 93.9 × 83.8 mm with 72 parts on 31 nets, routed with 353 tracks and 11 vias.
It is built around the SHTC3. Its parts include 10 resistors, 7 connectors, 6 diodes, 5 ICs and 2 capacitors. It belongs with the power and radio and wireless boards of this library.
Main components
1README
README.mdiC880A + Raspberry Pi Backplane
Buy this board at shop.coredump.ch!
This is a backplane to connect an iC880A-SPI concentrator board to a Raspberry Pi. It is inspired by the iC880A backplane by @gonzalocasas, but aims to give you the following additional features:
Power
- Screw terminal and footprint for MP1584 step-down regulator module (6.7-28V)
- Screw terminal for direct power input/output (5V)
- Protection diode and resettable polyfuse against high voltage spikes
- Protection against reverse polarity power input
Headers
- Full access to Raspberry Pi GPIO header
- Pin header for serial communication (RX/TX)
- 2 Pin headers for I²C based sensors (SDA/SCL/GND/3.3V/5V)
Sensors
- A SHT21 temperature/humidity sensor
- An MCP3425 16-bit ADC to measure RPi supply voltage
Other
- Pin header with flyback diode for 5V fan (5V/GND)
- General purpose button connected to GPIO pin (e.g. for controlled Raspi shutdown)
- Three general purpose SMD LEDs (Note: Only usable from Raspi versions with 40-pin GPIO header)
- Mounting holes for Raspberry Pi B+ / 2B / 3B / Zero
PCB
Schematics
See schematics-v1.4.pdf.
Development
This PCB was created using KiCad 4.
Make sure that you clone all submodules:
git submodule init
git submodule updateLicense
© 2017–2018 Danilo Bargen. Licensed under the TAPR Open Hardware License (www.tapr.org/OHL).
If you make any modification to this board, it would be great if you could let me know at mail@dbrgn.ch.
Parts
72| Qty | Value | Footprint | References |
|---|---|---|---|
| 4 | R | Resistors_SMD:R_1206 | R4, R5, R9, R13 |
| 3 | R | Resistors_SMD:R_0805 | R10, R11, R12 |
| 2 | C | Capacitors_SMD:C_1206 | C1, C3 |
| 2 | D | DO214:DO-214AC | D4, D6 |
| 2 | I2C | headers:header_1x5_unmarked | J1, J2 |
| 2 | PWR | Connectors_Terminal_Blocks:TerminalBlock_Pheonix_MPT-2.54mm_2pol | J4, J5 |
| 1 | 220Ω 1/8W | Resistors_SMD:R_1206 | R3 |
| 1 | 330Ω 1/8W | Resistors_SMD:R_1206 | R2 |
| 1 | 82Ω 1/8W | Resistors_SMD:R_1206 | R1 |
| 1 | D_TVS | DO214:DO-214AA | D5 |
| 1 | FAN | headers:header_1x2_marked | J6 |
| 1 | IC880A-SPI | ic880a:IC880A-SPI | U2 |
| 1 | LED_Blue | LEDs:LED_1206 | D1 |
| 1 | LED_Red | LEDs:LED_1206 | D3 |
| 1 | LED_Yellow | LEDs:LED_1206 | D2 |
| 1 | LOGO | oshw-logos:OSHW_MASK_7MM | G*** |
| 1 | MCP3425A0T-E/CH | TO_SOT_Packages_SMD:SOT-23-6 | U5 |
| 1 | MP1584_MODULE | regulators:MP1584_MODULE_ZVEPOWER | U4 |
| 1 | PPS | headers:header_1x1_unmarked | J7 |
| 1 | Polyfuse | Capacitors_SMD:C_1812 | F1 |
| 1 | Q_NMOS_GSD | TO_SOT_Packages_SMD:SOT-23 | Q4 |
| 1 | Q_PMOS_GSD | TO_SOT_Packages_SMD:SOT-23 | Q5 |
| 1 | Raspberry_Pi_2_3 | headers:Pin_Header_Straight_2x20_Pitch2.54mm | U1 |
| 1 | SER | headers:header_1x2_unmarked | J3 |
| 1 | SHTC3 | sensirion:SHTC1 | U6 |
| 1 | SW_Push | buttons:SW_Mikroshop | SW1 |
The 35 most common of 72 parts.
Questions
How big is the Backplane PCB?
It measures 93.9 × 83.8 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Backplane use?
72 parts, built around the SHTC3. 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 Backplane KiCad files?
From the dbrgn/ic880a-backplane repository on GitHub, at the commit this page was made from: the board is backplane.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the Backplane design in my own project?
Its repository states no licence, so its author keeps all rights: ask dbrgn before reusing the design.
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