Capture High-Fidelity Audio with Precision The INMP441 is a high-performance, low-power, omnidirectional MEMS microphone designed for digital audio applications. Unlike traditional analog microphones, the INMP441 features a built-in 24-bit I2S interface, allowing it to connect directly to digital processors like the ESP32, DSPs, or microcontrollers without needing an external audio codec. With its compact circular design (approx. 1.5cm diameter) and pre-soldered headers, this module is perfect for near-field audio recording, voice recognition projects, and DIY smart home devices. Key Features: Digital Clarity: Industry-standard 24-bit I2S interface for direct digital output. High Performance: Excellent Signal-to-Noise Ratio (SNR) of 61 dBA and high sensitivity (-26 dBFS). Broadband Response: Flat frequency response from 60 Hz to 15 kHz ensures natural, high-definition sound. Low Power: Extremely low current consumption (1.4mA), ideal for battery-operated devices. Bottom Port Design: Omnidirectional pickup pattern for consistent audio capture from all directions. Technical Specifications: Input Voltage (VCC): 1.8V to 3.3V Interface: I2S (Inter-IC Sound) PSR: -75 dBFS Dimensions: Diameter ~1.5cm Pin Definition & Wiring Guide: Pin Name Function SCK Serial Clock Serial data clock for the I2S interface. WS Word Select Selection for I2S interface (Left/Right clock). L/R Channel Select Low (GND): Left Channel output. High (VDD): Right Channel output. SD Serial Data Digital audio data output. VCC Power Input power (1.8V - 3.3V). GND Ground Common ground. ESP32 Connection Tutorial: Get started quickly with your ESP32 development board: SCK → GPIO 14 WS → GPIO 15 SD → GPIO 32 L/R → GND (for Left Channel) GND → GND VDD → 3.3V
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