INMP441 MEMS High Precision Omnidirectional Microphone Module

INMP441 MEMS High Precision Omnidirectional Microphone Module delivers clear, low-noise digital audio capture over I²S. Designers integrate it into voice assistants, IoT nodes, and audio recorders to stream high-fidelity mono data with simple clocking and minimal CPU load.

Key Features:

• Digital I²S Output: Streams PDM-converted PCM-ready data for direct MCU/SoC input.
• Omnidirectional Pattern: Captures sound uniformly for near- and far-field use.
• Low Noise, High SNR: Typical SNR ~61 dBA for clean voice pickup.
• Wide SPL Handling: Supports loud environments with low distortion.
• Low Power: Operates efficiently for battery-powered designs.
• Simple Left/Right Select: L/R pin configures left or right channel on shared data line.

Technical Specifications:

• Microphone IC: INMP441 digital MEMS microphone
• Interface: I²S (BCLK/SCK, LRCLK/WS, DOUT)
• Supply Voltage (Module): 3.3 V DC typical
• Sensitivity: −26 dBFS ±1 dB (typical)
• Signal-to-Noise Ratio: ~61 dBA (typical)
• Frequency Response: 60 Hz to 15 kHz usable band (voice-band focused)
• Output Format: 24-bit right-justified I²S (common MCU-compatible modes)
• Clocking: BCLK commonly 1–3.072 MHz; LRCLK commonly 16/32/48 kHz
• Current Consumption: ~1 mA to 2 mA (operating, typical)
• Operating Temperature: −40 °C to +85 °C

Mechanical Specifications:

• Form Factor: Compact PCB module with sound port on top
• Mounting: 2.54 mm header-compatible through-holes
• Finish: ENIG or HASL pads for reliable soldering
• Housing: MEMS transducer in protective acoustic cavity

Dimensions:

• Module Size: Approx. 15 mm × 10 mm × 3 mm (varies by batch)
• Hole Pitch: 2.54 mm between adjacent pins
• Sound Port: ~Ø 0.5–1.0 mm top opening

Pinout and Wiring:

• VDD: 3.3 V power input
• GND: Ground
• SCK / BCLK: Bit clock from host
• WS / LRCLK: Word select (left/right clock) from host
• SD / DOUT: Serial data output from microphone
• L/R: Channel select; tie to GND for left, to VDD for right
• Connect VDD and GND to 3.3 V rail. Provide BCLK and LRCLK from MCU/SoC, then read PCM data on DOUT. Use short traces and keep the sound port unobstructed.

Datasheet Reference:

• Search for “INMP441 datasheet” and “INMP441 application notes” for full electrical characteristics, timing diagrams, and recommended I²S configurations.

Applications:

• Voice Assistants and Smart Speakers: Capture commands with low noise.
• IoT and Edge Audio: Stream microphone data to MCUs and Wi-Fi/BT SoCs.
• Environmental Monitoring: Log sound levels and events.
• Portable Recorders and Wearables: Add compact digital audio input.
• Robotics and Drones: Enable voice control and acoustic sensing.

Equivalent Models:

• ICS-43434: I²S digital MEMS microphone with similar performance
• SPH0645LM4H-B: I²S MEMS mic used in low-power audio nodes
• MP34DT05: Digital MEMS alternative; verify pinout and clocking

Package Includes:

• 1 × INMP441 MEMS High Precision Omnidirectional Microphone Module