Datasheet Analog Devices ADPD188BI — Ficha de datos

Data Sheet Integrated Optical Module for
Smoke Detection
ADPD188BI FEATURES GENERAL DESCRIPTION 3.8 mm Г— 5.0 mm Г— 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 The ADPD188BI is a complete photometric system for smoke
detection using optical dual wavelength technology. The module
integrates a highly efficient photometric front end, two light
emitting diodes (LEDs), and two photodiodes (PDs). These
items 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 control …