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Ic880a backplane

dbrgn·ic880a-backplane

Ic880a backplane PCB layout, top view — open source Raspberry Pi board by dbrgn
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About the Ic880a backplane PCB

Ic880a backplane is an open source Raspberry Pi PCB design by dbrgn, published on GitHub under the TAPR-OHL-1.0 license. It is a 2-layer board measuring 93.9 × 83.8 mm, with 34 components from 25 distinct parts.

Its main chip is the Raspberry_Pi_2_3, from the Raspberry Pi family. Other key parts include the IC880A-SPI, MP1584_MODULE, MCP3425A0T-E/CH and SHTC3. By type, the board carries 10 resistors, 7 connectors, 6 diodes, 5 ICs, 2 transistors and 2 capacitors.

It belongs with the sensors and power & battery designs in this gallery.

From the project

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.

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:

- 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

Ic880a backplane, from the project README
From the project README

Main components on the Ic880a backplane

Raspberry_Pi_2_3IC880A-SPIMP1584_MODULEMCP3425A0T-E/CHSHTC3

Ic880a backplane bill of materials (BOM)

34 components, 25 distinct parts.

QtyPartRefs
1
Raspberry_Pi_2_3
U1
1
IC880A-SPI
U2
1
MP1584_MODULE
U4
1
MCP3425A0T-E/CH
U5
1
SHTC3
U6
1
Q_NMOS_GSD
Q4
1
Q_PMOS_GSD
Q5
2
I2C
J1, J2
1
SER
J3
2
PWR
J4, J5
1
FAN
J6
1
PPS
J7
1
Polyfuse
F1
1
SW_Push
SW1
1
LED_Blue
D1
1
LED_Yellow
D2
1
LED_Red
D3
2
D
D4, D6
1
D_TVS
D5
2
C
C1, C3
Show 5 more
QtyPartRefs
1
82Ω 1/8W
R1
1
330Ω 1/8W
R2
1
220Ω 1/8W
R3
4
R
R4, R5, R9, R13
3
R
R10, R11, R12

Ic880a backplane design files

The KiCad project lives in the dbrgn/ic880a-backplane repository on GitHub; these links point at the commit this page was built from.

Ic880a backplane: common questions

What microcontroller does the Ic880a backplane use?

The Ic880a backplane is built around the Raspberry_Pi_2_3, from the Raspberry Pi family.

How big is the Ic880a backplane PCB?

The Ic880a backplane measures 93.9 × 83.8 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Ic880a backplane?

34 components, from 25 distinct parts. The full bill of materials is listed on this page.

Where can I download the Ic880a backplane design files?

From the dbrgn/ic880a-backplane repository on GitHub, which has the KiCad layout; the links under Design files point to each one.

Can I use the Ic880a backplane design in my own project?

Yes, under the terms of its TAPR-OHL-1.0 license, which dbrgn chose for the repository.

Can I test firmware for the Ic880a backplane without the hardware?

Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug Raspberry Pi firmware against it before you order a PCB.

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