Overview

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 3V to 5V 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.

RAA239101 Block Diagram
RAA239101 Block Diagram
  • Ultra-low current consumption
  • 9V or 3V to 5V 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

Documentation

= Featured Documentation
Type Title Date
Datasheet - Short-form
RAA239101 Short-Form Datasheet
PDF 144 KB
Datasheet
RAA239101 Datasheet
Log in to Download PDF 1.63 MB
Product Change Notice
PCN21057 - Alternate assembly facility of the listed Renesas QFN / TQFN packaged products
PDF 179 KB
3 items

Design & Development

EU070-SMOKEDETPOCZ Smoke Detector Board

EU070-SMOKEDETPOCZ

Development
Learn More

Household Smoke Detector Development Board

A photoelectric smoke detector consists of an IR photodiode (sender) and a phototransistor (receiver/detector) arranged inside a so-called smoke chamber. Inside this...

Featured Documents:
EU070-SMOKEDETPOCZ Smoke Detector - Hardware Guide
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ECAD Models

Schematic symbols, PCB footprints, and 3D CAD models from SamacSys can be found by clicking on products in the Product Options table. If a symbol or model isn't available, it can be requested directly from the website.

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Product Options

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    Pkg. Type
    Lead Count (#)
    Carrier Type
    Moisture Sensitivity Level (MSL)
    Buy / Sample
    Part Number
    RAA239101A2GNP#HA0
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    Samples Available
    		 QFN 32 Reel 3 Get Samples,
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