HardLabs

I2S-Hat

raptorlightning·I2S-Hat·I2SHat/I2SHat.kicad_pcb

I2S-Hat layout, top view — open source AVR/Arduino board by raptorlightning

About the I2S-Hat

I2S-Hat is an open source AVR/Arduino PCB design by raptorlightning, published on GitHub under the GPL-3.0 license. It is a 4-layer board measuring 65 × 56 mm, with 94 components from 31 distinct parts.

Its main chip is the Arduino_Nano_v3.x, from the AVR/Arduino family. Other key parts include the 74LVC1G125DBV, NC7SZ157P6X, 74LVC1GU04DBV, 74LV1T04DBV and WM8804. By type, the board carries 33 resistors, 25 capacitors, 11 ICs, 7 inductors, 5 transistors and 5 connectors.

It belongs with the audio and dev boards & breakouts designs in this gallery.

From the project

An SPDIF Hat for the Raspberry Pi 2-X for SPDIF Communication

To make this possible, a combination of software and hardware is required. The schematics and PCB to create the SPDIF hat are provided in KiCAD format in the "I2SHat" folder. Please modify the schematic and PCB as required for component availibility.

The other aspects of the circuit have been tested and proven. Resistor tolerances are of no concern, neither are capacitor tolerances. Regardless, don't use a 10uF Y5U 5V rated MLCC capacitor for the regulator outputs. That will violate the datasheet.

I2S-Hat, from the project README
From the project README

Main components on the I2S-Hat

74LVC1G125DBVNC7SZ157P6X74LVC1GU04DBV74LV1T04DBVWM8804SN74LV1T34DBVLD1117S33Arduino_Nano_v3.x

I2S-Hat bill of materials (BOM)

94 components, 31 distinct parts.

QtyPartRefs
3
74LVC1G125DBV
U1, U3, U4
1
NC7SZ157P6X
U2
1
74LVC1GU04DBV
U5
1
74LV1T04DBV
U6
1
WM8804
U7
1
SN74LV1T34DBV
U8
3
LD1117S33
U9, U10, U11
1
Arduino_Nano_v3.x
A1
5
BSS138
Q1, Q2, Q3, Q4, Q5
1
ABMM-12.000MHZ
Y1
1
TORX142L
J1
1
TOTX142L
J2
1
TX_RCA
J3
1
Raspberry_Pi_2_3
J4
1
RX_RCA
J5
1
GW12RCP
SW1
4
TestPoint
TP4, TP5, TP6, TP7
1
SS1P3L-M3/84A
D1
4
Ferrite_Bead_Small
FB1, FB2, FB3, FB4
3
47uH
L1, L2, L3
Show 11 more
QtyPartRefs
16
100n
C1, C2, C3, C4, C5, C6, C7, C8 +8
3
1u
C12, C13, C17
2
22p
C15, C16
4
47u
C19, C21, C23, C25
10
33
R1, R2, R3, R5, R10, R21, R22, R23 +2
17
10K
R4, R6, R9, R11, R13, R14, R15, R16 +9
1
210
R7
1
110
R8
1
75
R12
1
100K
R30
2
110
R32, R33

I2S-Hat design files

The KiCad project lives in the raptorlightning/I2S-Hat repository on GitHub; these links point at the commit this page was built from.

I2S-Hat: common questions

What microcontroller does the I2S-Hat use?

The I2S-Hat is built around the Arduino_Nano_v3.x, from the AVR/Arduino family.

How big is the I2S-Hat?

The I2S-Hat measures 65 × 56 mm, has 4 copper layers and is 1.6 mm thick.

How many components are on the I2S-Hat?

94 components, from 31 distinct parts. The full bill of materials is listed on this page.

Where can I download the I2S-Hat design files?

From the raptorlightning/I2S-Hat repository on GitHub, which has the KiCad layout; the links under Design files point to each one.

Can I use the I2S-Hat design in my own project?

Yes, under the terms of its GPL-3.0 license, which raptorlightning chose for the repository.

Can I test firmware for the I2S-Hat without the hardware?

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

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