Transcription of Integrated Optical Module for Smoke ... - Analog Devices
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Integrated Optical Module for Smoke ... - Analog Devices
Integrated Optical Module for Smoke Detection Data Sheet ADPD188BI. FEATURES GENERAL DESCRIPTION. mm mm mm Module with Integrated Optical The ADPD188BI is a complete photometric system for Smoke components detection using Optical dual wavelength technology. The Module 1 blue LED, 1 IR LED, and 2 photodiodes integrates a highly efficient photometric front end, two light 2 external inputs for other sensors (for example, carbon emitting diodes (LEDs), and two photodiodes (PDs). These monoxide (CO) and temperature) items are housed in a custom package that prevents light from Three 370 mA LED drivers going directly from the LED to the photodiode without first 20-bit burst accumulator enabling 20 bits per sample period entering the Smoke detection chamber. On-board sample to sample accumulator enabling up to The front end of the application specific Integrated circuit 27 bits per data read (ASIC) consists of a control block, a 14-bit Analog -to-digital Optimized SNR for signal limited cases converter (ADC) with a 20-bit burst accumulator, and three I2C or SPI communications flexible, independently configurable LED drivers.
detection. The analog front end (AFE) features best- in-class rejection of signal offset and corruption due to modulated interference commonly caused by ambient light. The data output and functional configuration occur over a 1.8 2V I C interface or serial peripheral interface (SPI) port. FUNCTIONAL BLOCK DIAGRAM . TIME SLOT A TIME SLOT B ...
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