PDM
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
Include
- 1x PDM mini Unit
- 1x HY2.0 4P Cable(5CM)
Applications
- Spectrum Analyzer
- Recorder
- Noise meter
Specification
| Resources | Parameter |
|---|---|
| Digital microphone | SPM1423 |
| 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 Current | 600µA |
| Net Weight | 4g |
| Gross Weight | 8g |
| Product Size | 24*24*13mm |
| Package Size | 35*36*18mm |
| Case material | Plastic(PC) |
EasyLoader
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.
PDM unit is connected to port a (this program does not support M5GO Base), and the sound spectrum is displayed on the screen
Schematic
Related Link
- Datasheet
Example
Arduino
Please click here to download Arduino Code.
UIFlow example
UIFlow
- I2S initialize
- record wave file to sdcard
- deinit PDM Unit
