Analog Devices Inc. ADPD188BI Integrated Optical Module 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). The module is housed in a custom package to prevent light from going from the LED to the photodiode without 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 circuitry includes flexible LED signaling and synchronous 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 1.8V I2C interface or serial peripheral interface (SPI) port.
Features
- 3.8mm x 5.0mm x 0.9mm 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)
- 20-bit burst accumulator enabling 20 bits per sample period
- Three 370mA LED drivers
- On-board sample to sample accumulator enabling up to 27 bits per data read
- Optimized SNR for signal limited cases
- I2C or SPI communications
Read more: ANALOG DEVICES INC. ADPD188BI INTEGRATED OPTICAL MODULE
