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)


  • Spectrum Analyzer
  • Recorder
  • Noise meter


Resources Parameter
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)


EasyLoader is a concise and fast program writer, which has a built-in case program related to the product. It can be burned to the main control by simple steps to perform a series of function verification.

Download Windows Version Easyloader Download MacOS Version Easyloader

PDM unit is connected to port a (this program does not support M5GO Base), and the sound spectrum is displayed on the screen




Please click here to download Arduino Code.

Last updated: 2020-12-14