Description
This PDM MEMS Microphone Breakout Module is a compact digital microphone solution designed for modern microcontrollers that support PDM (Pulse Density Modulation) audio input. Unlike traditional analog microphones or I2S audio devices, this module outputs a 1-bit digital PDM data stream, making it ideal for systems without analog inputs and for low-noise digital audio capture.
The microphone requires an external high-speed clock (typically 1–3 MHz) and outputs a synchronized digital data signal whose pulse density represents the audio waveform. Many 32-bit MCUs (ESP32, RP2040, nRF52, SAMD, etc.) include native PDM peripherals, allowing direct audio capture with minimal external components.
A JST SH 4-pin connector (3V, GND, DATA, CLOCK) is provided for clean, solder-free wiring, making it suitable for compact enclosures, flexible placement, and professional-looking builds. An onboard solder jumper allows selection between Left or Right channel, enabling stereo microphone array designs.
Key Features
Digital PDM output (no analog signal, no external ADC required)
Ideal for MCUs without analog inputs
Requires only clock + data for audio capture
JST SH connector for reliable, compact connections
Channel select (Left / Right) via solder jumper
Fully assembled and tested module
Technical Overview
Microphone Type: MEMS digital microphone
Output Format: Pulse Density Modulation (PDM)
Clock Input: 1 MHz – 3 MHz (external)
Logic Level: 3.3 V
Interface Pins: 3V, GND, DAT, CLK
Channel Select: Left / Right (configurable)
Integration Notes
There are multiple ways to work with PDM microphones depending on your platform:
Native PDM peripheral: Hardware handles sampling and filtering automatically
Partial hardware support: MCU collects raw PDM data, software performs decimation/filtering
No PDM peripheral: Advanced users may implement PDM capture via SPI or timers
Analog workaround: Clock the mic, low-pass filter the data, then read via ADC
Ensure your microcontroller and software environment support PDM before use.
Typical Applications
Voice recognition and wake-word detection
Smart assistants and IoT voice interfaces
Audio logging and sound level monitoring
Wearables and compact embedded systems
Stereo microphone arrays (with L/R configuration)
Package Contents
