I2S-001
I2S Isolator
Galvanic isolation for I2S and optional I²C between your digital side and audio side. Factory options for power, extra channels, on-board reference clock, and I²C.
Click a photo to enlarge. Pinout, wiring, and package contents: User's Guide.
What it does
I2S-001 sits between your digital side (MCU) and audio side (codec). I2S clocks and data — and optionally I²C and extra GPIO — cross a galvanic barrier so ground loops and digital switching noise are less likely to show up as hum on the analog path.
Both sides are meant to sit at roughly the same potential. Isolation is for noise on supplies and signal wires, not high-voltage stand-off.
Ordering — I2S-001-ABCD
Four factory digits. The board is built to that code; you do not change A–D after delivery. Combinations on Tindie; specials (another clock frequency, …) via the contact links there.
| Digit | 0 | 1 | 2 |
|---|---|---|---|
| A — power | You supply both sides | 3.3 V noisy in → isolated 3.3 V out | 5 V noisy in → isolated 3.3 V out |
| B — I2S channels | Base 3 + 1 on pins 1–4 | 4 + 4 on pins 1–4 and 7–10 | — |
| C — pin 10 | Your signal (GPIO, external MCLK, …) | On-board 12.288 MHz on pin 10 of both headers | — |
| D — I²C | No I²C on the board | SDA / SCL on pins 11–12 | — |
Digit C applies when B = 1 — a board with B = 0 and C ≠ 0 is not a product. Digit D is independent. Worked examples: I2S-001-0000, I2S-001-1101, I2S-001-2110 — see the wiring drawings.
In the bag
- I2S-001 board
- Two 1×12 male–male pin-header strips (not soldered)
- Adhesive label — part number, serial, factory-test mark, QR
- Resealable ESD bag
1.1 × 1.4 in board, 0.1″ pitch (breadboard). Details in User's Guide §8.
User's Guide
Pin map, power, I2S channel directions, I²C jumpers, wiring examples, and mechanical drawing.
Primers: Understanding I2S Bus and Audio Isolation, Understanding I2C Bus Isolation.