INMP441 Omnidirectional Microphone Module

The INMP441 is a powerful, energy-saving, omnidirectional MEMS microphone with digital output and connection at the bottom. The complete INMP441 solution consists of a MEMS sensor, signal preparation, analog-to-digital converter, anti-aliasing filter, power management and an industry-standard 24-bit I2S interface.

• Compatible: Via the I2S interface, the INMP441 can be directly connected to digital processors such as DSPs and microcontrollers without the need for an audio codec for use in the system.
• Compact design: The INMP441 has a high signal-to-noise ratio and is an excellent choice for near-field applications. The INMP441 features a flat broadband frequency response that results in a high resolution of natural sound.
• High performance: digital I2S interface with high-precision 24-bit data; the high signal-to-noise ratio is 61 dBA; high sensitivity – 26 dBFS; stable frequency response from 60 Hz to 15 kHz; low power consumption: low power consumption 1.4 mA; high PSR: -75 dBFS

INMP441 Omnidirectional Microphone Module

1. Digital I2S interface with high precision 24-bit data.
2. High signal to noise ratio is 61 dBA
3. High sensitivity – 26 dBFS.
4. Stable frequency response from 60 Hz to 15 kHz
5. Low power consumption: low current consumption 1.4 mA.
6. High PSR: -75 dBFS.
Interface definition:

SCK: Serial data clock for I2S interface.
WS: Serial data word selection for I2S interface.
L/R: Left/Right channel selection.
When set to low, the microphone outputs a signal on the left channel of the I2S frame.
When set to high level, the microphone outputs signals on the right channel
SD: Serial data output of the I2S interface.
VCC: Input power, 1.8V to 3.3V.
GND: power ground.

Connect to ESP32: (INMP441 ESP32)

SCK >> GPIO14
SD >> GPIO32
GPIO15.
L/R >> GND
GND >> GND
VDD >> VDD3.3.