AN-2033 APPLICATION NOTE Calibrating the ADPD188BI Optical Smoke and Aerosol Detection Module

PublishTime：2021-12-30

■INTRODUCTION
●The ADPD188BI is a complete photometric system for smoke detection using optical, dual-wavelength technology. The module integrates a highly efficient photometric front end, blue and infrared (IR) light emitting diodes (LEDs), and a photodiode, housed in a custom package that prevents light going directly from the LED to the photodiode without first entering the smoke detection chamber. The ADPD188BI is used with an EVAL-CHAMBER smoke chamber to create a complete, optical smoke detection solution for implementation in residential and industrial smoke detectors. The EVAL-CHAMBER is available for purchase with an order of the EVAL-ADPD188BIZ-S2.
●This application note describes the calibration of the ADPD188BI using calibration coefficients that are programmed into the on-chip, nonvolatile memory (NVM) to reduce device to device variation to <+10%.
●For specific LED drive settings and test/application environments, the ADPD188BI exhibits device to device variability in LED response. The LED response has a slope (gain) and intercept (offset) that varies from device to device, which results in device to device v ariation in response to a common environment and can be calibrated with gain and offset calibration coefficients. The primary application of this calibration is to allow more effective comparison of multiple device outputs as they are instantiated in the end application. This calibration significantly reduces any device to device o ptical variation and allows simplified observation of the variations specific to the application environment.

Brand of Product：	ADI
Part#：	ADPD188BI 、 EVAL-ADPD188BIZ-S2 More Part#
Product Category：	Detection Module 、 photometric system More
Application：	More
Data Type：	Application note & Design Guide More
Safety & Environment Standards：	More
Operating Temperature：	Please see the document for details
Qualification Grade：	More
Qualification Approval：	More
Package：
Language：	English Chinese Chinese and English Japanese
Date of Creation：	2/2021
Version Number：	Rev. A
Data Encoding：	AN-2033
Data Size：	248 KB

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