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ADPD188BI Integrated Optical Module for Smoke Detection

數據:

優勢和特點

  • 3.8 mm × 5.0 mm × 0.9 mm module with integrated optical components
  • 1 blue LED, 1 IR LED, and 2 photodiodes
  • 2 external inputs for other sensors (for example, CO and temperature)
  • Three 370 mA LED drivers
  • 20-bit burst accumulator enabling 20 bits per sample period
  • On-board sample to sample accumulator enabling up to 27 bits per data read
  • Optimized SNR for signal limited cases
  • I2C or SPI communications

產品詳情

The ADPD188BI is a complete photometric system for smokedetection using optical dual wavelength technology. The module integrates a highly efficient photometric front end, two lightemitting diodes (LEDs), and two photodiodes (PDs). Theseitems are housed in a custom package that prevents light from going directly from the LED to the photodiode without first entering the smoke detection chamber.

The front end of the application specific integrated circuit(ASIC) consists of a control block, a 14-bit analog-to-digital converter (ADC) with a 20-bit burst accumulator, and three flexible, independently configurable LED drivers. The controlcircuitry includes flexible LED signaling and synchronous detection. The analog front end (AFE) features best-in-classrejection of signal offset and corruption due to modulatedinterference commonly caused by ambient light. The dataoutput and functional configuration occur over a 1.8 V I2Cinterface or serial peripheral interface (SPI) port.

Applications

  • Smoke Detection

方框圖





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