The Analog Devices Inc. CN0537 Reference Design for UL-217 Smoke Detector makes use of the EVAL-CN0537-ARDZ Evaluation Board. This Evaluation Board features a pre-mounted ADPD188BI Module, housed in a proprietary Smoke Chamber that is specifically designed to meet device and industry requirements. The internal geometry of this smoke chamber allows for the highest signal-to-noise ratio (SNR) readings and, therefore, optimal PTR values for the ADPD188BI.
When combined with the EVAL-ADICUP3029 Development Platform, the EVAL-CN0537-ARDZ Evaluation Board can be used to create a Reference Design for a smoke/fire detector circuit compliant with the ANSI/UL-217 Standard for Smoke Alarms. The UL 217 Standard includes criteria to reduce nuisance alarms and address smoke characteristics between fast-moving and smoldering fires, greatly increasing accuracy and safety.
As battery-powered devices are a common use case for smoke detectors, the Reference Design minimizes data required from the sensor and the number of computations per alarm determination. This design allows the ADPD188BI to output less data, thereby saving power and reducing consumption cycles in the microcontroller, yet still meeting the strict UL-217 specifications.