Smoke & heat detector

Products and reference designs

Smoke & heat detector

Block diagram

Overview

Wireless connectivity, audio and multiple sensing (temperature, humidity and motion) are new trends in smoke and heat detectors. Our integrated circuits and reference designs help you solve challenges from emerging standards and technologies such as photoelectric, ionization, and heat/carbon dioxide detection.

Design requirements

Smoke and heat detector designs often require:

  • Sensors at an optimized bill of material (BOM) cost that meet industry standards.
  • Ten-year battery life with increased functionality.
  • Distinction between real and nuisance sources of smoke.
  • Various input power sources with a wide supply voltage range.
  • Efficient sensing of obstructions relative to detector placement.

Extend the capabilities of this application

Block diagram

Find products and reference designs for your system.

Residential smoke & heat detector

24V DC 24V DC Wired DC Power Option Wired DC Power Option Battery power option Battery power option Point of Load Point of Load Buzzer, LEDs Buzzer, LEDs Wired AC power with battery backup option Wired AC power with battery backup option Piezo buzzer Piezobuzzer Photoelectric IR LED drive Photoelectric IR LED drive LED (1/Chan.) LED(1/Chan.) Amp 1/Ch Amp1/Ch Photoelectric analog front-end Photoelectric analog front-end Photodiode (1/Chan.) Photodiode(1/Chan.) Amp 1-2/Ch Amp1-2/Ch Ionization analog front-end Ionization analog front-end Ionization sensor Ionization sensor Amp x2 Ampx2 Heat detector analog front-end Heat detector analog front-end Temperature sensor Temperature sensor OR OR Thermistor Thermistor Amp Amp Gas detection analog front-end Gas detection analog front-end CO sensor CO sensor Amp (Pot) Amp(Pot) Amp (Vref) Amp(Vref) Obstruction sensing Obstruction sensing Optical sensor Optical sensor Ultrasonic transducer Ultrasonic transducer OR OR Amp 1-2/Ch Amp1-2/Ch Visual indicators Visual indicators Status LEDs Status LEDs RGB & white LED Driver RGB & white LED Driver Self-diagnostics/monitoring Self-diagnostics/monitoring Voltage supervisor, RESET, Watchdog timer Voltage supervisor, RESET, Watchdog timer Audible alarm interface Audible alarm interface Transistor level implementation Transistor level implementation Piezo driver Piezo driver OR OR OR OR Amp Amp Audio interface Audio interface Speaker amp Speaker amp Audio speaker Audio speaker Audio DAC Audio DAC Tamper detection Tamper detection Hall effect sensor Hall effect sensor Ambient light sensor Ambient light sensor Reed switch Reed switch Push to test and silence function Push to test and silence function Silence/Test button Silence/Test button ESD protection ESD protection Hall effect sensor Hall effect sensor OR OR Push button controller Push button controller Wireless Interface Wireless Interface Radio (2.4GHz, Sub-1GHz or Wi-Fi) Radio (2.4GHz, Sub-1GHz or Wi-Fi) Energy storage Energy storage MOSFETs (reverse p.) MOSFETs (reverse p.) Battery fuel gauge Battery fuel gauge 3/9V Battery 3/9V Battery Isolated AC/DC power supply Isolated AC/DC power supply Offline converter Offline converter MOSFETs (blocking) MOSFETs (blocking) 120/230V AC 120/230V AC 3/9V backup battery 3/9V backup battery Shunt voltage reference Shunt voltage reference Non-isolated DC/DC power supply Non-isolated DC/DC power supply Wide Vin buck or LDO Wide Vin buck or LDO OR OR Buck or LDO Buck or LDO Boost converter Boost converter Buck or LDO Buck or LDO Boost converter Boost converter OR OR Load switch Load switch Digital processing Digital processing MCU (with integrated analog) or Wireless MCU (with integrated... MCU (with integrated analog)orWireless MCU(with integrated radio) Buffer/Driver Buffer/Driver Voltage translator Voltage translator Logic gate Logic gate Voltage reference Voltage reference

Technical documentation

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Type Title Date
Technical article What’s with chirping smoke detectors? PDF | HTML 30 Jun 2023
Application note LPV801 Micropower Ionization Smoke Detector 29 Nov 2016
Circuit design Driving a SAR ADC directly without a front-end buffer circuit (Rev. B) PDF | HTML 23 Sep 2024
White paper Enabling tomorrow’s sensing applications with smart analog microcontrollers (Rev. A) 22 Nov 2019
Application note Dual-Ray Smoke Detector with the TPS8802 and MSPM0 MCUs PDF | HTML 22 Aug 2023
White paper Smart Analog Combo Enabling Tomorrow's Sensing and Measurement Applications (Rev. B) PDF | HTML 22 Aug 2018
Application note Comparing EMI Performance of LPV802 with Other Devices in a Gas Sensor App 18 Oct 2016
White paper Connected microcontrollers essential to automation in buildings (Rev. A) 15 Apr 2021
Application note Wireless Smoke Alarms With Sub-1GHz SimpleLink Wireless MCU (Rev. B) 13 Mar 2018
Application note Dual-Ray Smoke Detector Design With MSP430FR2355 MCUs 11 May 2022
Application note Dual-Ray Smoke Detector Design With MSP430FR2355 MCUs 11 May 2022
Application note How to Use the Smart Analog Combo in MSP430™ MCUs (Rev. A) PDF | HTML 10 May 2022
Application note How to Use the Smart Analog Combo and Transimpedance Amplifier on MSP430FR2311 (Rev. A) PDF | HTML 08 May 2022
Application note SC Temp Sensors Challenge Precision RTDs and Thermistors in Build Automation (Rev. A) 08 May 2019
Technical article Designing a smoke detector with the MSP430 MCU Smart Analog Combo PDF | HTML 06 Sep 2023
Application brief Power Cycling an IoT System with a Nano-power System Timer 06 Dec 2016
Application note Precision Voltage Offset: When Does it Matter? (Rev. A) 02 Nov 2016

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