M5stack Grove - PDM MEMS Microphone Unit (SPM1423)


Description PDM mini Unit is a digital MEMS silicon-based microphone based on PDM (Pulse Density Modulation) signal. The microphone has high signal-to-noise ratio, high sensitivity, low power consumption, anti-radio frequency interference, smooth frequency response and other characteristics. It automatically switches the microphone state according to the clock frequency (power down/activate/sleep)and can be widely used for audio data collection on wearable devices and smart digital devices.

Product Features

  • I2S PORT,PDM encoding output (CLK/DAT)
  • High sensitivity, high signal to noise ratio
  • Low power consumption
  • Anti-radio frequency interference
  • Compatible with LEGO


  • 1x PDM mini Unit
  • 1x HY2.0 4P Cable(5CM)
  • Specification

    Sensitivity 94dB SPL@1KHz Nom.:-22dBFS
    Signal to Noise Ratio 94dB SPL@1KHz,A-weighted Nom.:61.4dB
    Total Harmonic Distortion 100dB SPL@1KHz Nom.:1%
    Working voltage range 1.6 V to 3.6 V
    Working Current 600µA
    Net Weight 4g
    Gross Weight 8g
    Product Size 24*24*13mm
    Package Size 35*36*18mm
    Case material Plastic(PC)
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