The RAA239101 is a low-power Analog Front-End (AFE) IC; combined with a microcontroller, photoelectric emitter/detector(s), horn, and minimal external components, it forms a complete smoke detector.

The IC operates from a 3.3V or 9V battery and has an LDO to provide power to a microcontroller. The battery-check feature can be used to signal an alarm when the battery is low.

The RAA239101 provides a driver that can switch between two LEDs to pulse the smoke detection LED emitters with a DAC adjustable current. Two photodiode receiver channels with programmable gain amplification using an ADC allow the detection of smoke by sensing the LED light scattered off of smoke in a detection chamber.

Features

  • Ultra-low current consumption
  • 9V or 3.3V battery operation
  • LDO for microcontroller supply
  • 10-bit ADC for measuring voltage on 7 analog pins
  • Drives two LED emitters with 8-bit current DAC control from 45mA to 600mA
  • Two photodiode receivers with programmable gain amplifiers
  • General purpose IO
  • Horn driver with clamp diodes
  • SPI interface

Applications

  • Photoelectric smoke detectors

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Active QFN 32 Reel
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descriptionDocumentation

Title language Type Format File Size Date
Datasheets & Errata
star RAA239101 Short-Form Datasheet Datasheet - Short-form PDF 142 KB
RAA239101 Datasheet Datasheet PDF 1.65 MB