Integrated optical module reduces smoke detector false alarms

An integrated optical module featuring two LEDs, photodiode and analogue front-end (AFE) integrated in a single package has been launched by Analog Devices (ADI)

ADPD188BI’s, high-performing AFE offers high ambient light rejection and, says the company, reduces power consumption to support longer battery life.

The two LEDs help reduce false alarms often caused by steam and dust. False alarms are a leading factor in detectors being removed or disabled by consumers. According to the National Fire Protection Association, 23 per cent of deaths in the USA occurred where smoke detectors were not working or disabled.

The ADPD188BI is engineered to meet new UL217 requirements as well as EN54/14604 specifications. Its integrated design uses two colours to separate particle sizes, increasing the ability to detect and classify smoke types and reject nuisance sources.

The ADI solution enables a back-scattering design with closer proximity of the LED to the photodiode, reducing circuit board size and allowing for smaller smoke detectors that are more architecturally compatible for residential and commercial use.

Key features include 3.8 mm × 5.0 mm × 0.9 mm module with integrated optical components, Blue (470 nm) and IR (850 nm) LED, two external sensor inputs, 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, optimised SNR for signal limited cases and I2C or SPI communications.

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