Description The M5Stack PDM MEMS Microphone Unit (SPM1423) is a compact digital MEMS silicon microphone for audio data acquisition in wearable, IoT, and smart digital devices. It uses PDM (Pulse Density Modulation) signaling and provides CLK/DAT output for direct digital audio capture. The M5Stack PDM MEMS Microphone Unit (SPM1423) combines high sensitivity, high signal-to-noise ratio, low power consumption, strong RF interference immunity, and smooth frequency response. The microphone can switch between power-off, active, and sleep states according to the clock frequency, helping portable designs balance audio performance and power use. Features PDM signal output with CLK/DAT lines SPM1423 digital MEMS microphone High sensitivity and high signal-to-noise ratio Low power consumption for portable devices Strong RF interference immunity Smooth frequency response for audio acquisition Automatic power-off, active, and sleep state switching by clock frequency LEGO-compatible mounting design Specifications Digital Mic SPM1423 Signal Output PDM, CLK/DAT Sensitivity 94dB SPL@1KHz Typical: -22dBFS SNR 94dB SPL@1KHz, A-weighted Typical: 61.4dB THD 100dB SPL@1KHz Typical: 1% Operating Current 600µA Enclosure Material Plastic (PC) Product Size 24.0 x 24.0 x 13.0mm Product Weight 4.0g Package Size 138.0 x 93.0 x 7.0mm Gross Weight 8.0g Applications Spectrum analyzer projects Audio recording and voice capture Sound level meter prototypes Wearable and smart digital device audio input Embedded audio acquisition with M5Stack controllers Product List 1 x Unit Mini PDM 1 x HY2.0-4P Grove Cable (5cm) Other Content PinMap HY2.0-4P Wire Function Black GND Red 5V Yellow Data White Clock Resources Product documentation Arduino user guide Arduino example UiFlow2 documentation SPM1423 datasheet EasyLoader example FAQ What signal interface does this microphone unit use? It outputs digital PDM audio data through CLK and DAT lines. What is this microphone unit suitable for? It is suitable for audio recording, sound level measurement, spectrum analysis, and wearable or smart device audio acquisition. How does the microphone manage power consumption? The microphone can switch between power-off, active, and sleep states according to the clock frequency.
