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Backplane 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.

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iC880A + 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

Rendered

Rendered

Rendered

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 update

License

© 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.

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Backplane 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.

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