# Infineon_IM72D128

Infineon_IM72D128: PDM MEMs Microphone using ADAU7002 for PDM-TO-I²S convertion. To be fitted into I2S_Carrier.

Daughter card for the standardized [I2S_Carrier](https://wiki.adom.inc/caleb/i2s-carrier): finger-edge board (no machine pins — the carrier provides the dock) pairing the Infineon XENSIV IM72D128 PDM microphone with an ADI ADAU7002 PDM→I2S bridge.

## Signal chain

`IM72D128 (PDM, 1-bit ΣΔ) → ADAU7002 (PDM→I2S) → J2 fingers (SD / WS / SCK)`

`MIC_SEL` (J1.2) drives the mic's SELECT pin — pulled to +3v3 through 100 kΩ on-board (default = right/rising edge); the I2S_Carrier's jumper ties it to GND for left/falling.

## IM72D128 key specs (XENSIV, Sealed Dual Membrane)

| Parameter | Value |
|---|---|
| SNR | 72 dB(A) @ 3.072 MHz clock |
| Sensitivity | −36 dBFS ±1 dB @ 94 dB SPL |
| AOP | 128 dB SPL (10 % THD) |
| Dynamic range | 106 dB |
| THD | 0.5 % @ 94 dB SPL |
| Frequency range | 20 Hz – 20 kHz |
| VDD | 1.62 – 3.6 V (3.3 V on this board) |
| IDD | 980 µA @ 3.072 MHz · 25 µA standby |
| Ingress | IP57 (sealed dual-membrane MEMS) |
| Package | 4.00 × 3.00 × 1.2 mm, PG-LLGA |
| Port | Bottom (PCB sound hole under mic) |

Power mode is auto-selected by clock frequency; ultrasonic capture to 80 kHz @ 4.8 MHz clock.

## Pin Map

### J1 — POWER / SELECT (fingers, 3×1 mm)

| Pin | Net | Notes |
|---|---|---|
| 1 | `+3v3` | mic VDD + ADAU7002 IOVDD |
| 2 | `MIC_SEL` | SELECT; 100 kΩ pull-up to +3v3 |
| 3 | `GND` | |

### J2 — I2S (fingers, 3×1 mm)

| Pin | Net | Notes |
|---|---|---|
| 1 | `SD` | ADAU7002 SDATA; 100 kΩ to GND |
| 2 | `WS` | ADAU7002 LRCLK |
| 3 | `SCK` | ADAU7002 BCLK |

### U2 — IM72D128 (internal)

| Pin | Net |
|---|---|
| 1 DATA | `PDM_DATA` |
| 2 VDD | `+3v3` |
| 3 CLOCK | `PDM_CLK` |
| 4 SELECT | `MIC_SEL` |
| 5 GND | `GND` |

## Conversion note

Standard (non-molecule) OCCT conversion — this daughter has no MP markers or machine pins by design; anchoring and footprint JSON do not apply. Dock mechanics live on the I2S_Carrier.