INMP441 MEMS High Precision Omnidirectional Microphone Module I2S

The INMP441 is a digital MEMS microphone that is omnidirectional and has a bottom port. It is designed to be high-performing and low-power, and the complete solution includes a MEMS sensor, signal conditioning, analog to digital converter, anti-aliasing filter, power management, and a 24-bit I2S interface that is industry-standard.

The I2S interface is especially useful because it allows for direct connection to digital processors such as microcontrollers and DSPs without the need for an audio codec. With a high signal-to-noise ratio, the INMP441 is a great option for applications in close proximity. It also has a flat wideband frequency response that results in natural and high-definition sound.

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

NMP441 connection with ESP32:

• SCK -GPIO14
• SD Ð GPIO32
• WS Ð GPIO15
• L/R Ð GND
• GND Ð GND
• VDD Ð VDD3.3

Features:

• Digital I2S interface with high precision 24-bit data
• High signal to noise ratio is 61 dBA
• High sensitivity Ð 26 dBFS
• Stable frequency response from 60 Hz to 15 kHz
• Low power consumption: low current consumption 1.4 mA
• High PSR: -75 dBFS

Package Includes:

• 1 x INMP441 MEMS High Precision Omnidirectional Microphone Module I2S