Fire & Carbon Monoxide Alarm Detector Reference Design with Low BOM Cost & Integrated Battery Backup


Design files


This reference design is a carbon monoxide (CO) and fire alarm detector reference design which can identify typical alarm sounds, and has the wireless capabilities to alert the user if one is detected. This design is intended for home automation and "smart" environmental sensing. Once a 3kHz or 520Hz signal frequency is identified based on FFT power spectral density analysis, this system determines whether an alarm is occurring which can then be used with sensor to cloud to alert the homeowner in the case of an alarm outside of their detectible hearing range.

  • 3kHz and 520Hz alarm target frequencies
  • CO and fire alarm detection
  • Low BOM cost design
  • Variable microphone gain based on proximity to alarm
  • Sub-1GHz wireless communication enabled for sensor to cloud configuration
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A fully assembled board has been developed for testing and performance validation only, and is not available for sale.

Design files & products

Design files

Download ready-to-use system files to speed your design process.

TIDUDD1.PDF (22195 K)

Reference design overview and verified performance test data

TIDRT50.PDF (1493 K)

Detailed schematic diagram for design layout and components

TIDRT51.PDF (19 K)

Complete listing of design components, reference designators, and manufacturers/part numbers

TIDRT52.PDF (439 K)

Detailed overview of design layout for component placement

TIDRT54.ZIP (1460 K)

Files used for 3D models or 2D drawings of IC components

TIDCDX5.ZIP (2094 K)

Design file that contains information on physical board layer of design PCB

TIDRT53.PDF (2092 K)

PCB layer plot file used for generating PCB design layout


Includes TI products in the design and potential alternatives.

AC/DC & DC/DC converters (integrated FET)

UCC28881700-V Lowest Quiescent current off-line switcher

Data sheet: PDF | HTML

LM2903Dual differential comparator

Data sheet: PDF | HTML
ESD protection diodes

TPD1E10B0612-pF, ±5.5V, ±30-kV ESD protection diode in 0402 and SOD-523 package

Data sheet: PDF | HTML
General-purpose op amps

TLV2313Dual, 5.5-V, 1-MHz, low quiescent current (65-μA), RRIO operational amplifier

Data sheet: PDF | HTML
Linear & low-dropout (LDO) regulators

TPS780150-mA, nano-IQ, low-dropout voltage regulator with pin-selectable, dual-level output voltage

Data sheet: PDF | HTML
Load switches

TPS27081A8-V, 3-A, 44-mΩ load switch with adj. rise time

Data sheet: PDF | HTML
Sub-1 GHz wireless MCUs

CC1310SimpleLink™ 32-bit Arm Cortex-M3 Sub-1 GHz wireless MCU with 128kB Flash

Data sheet: PDF | HTML

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TIDCDX6 TIDA-01519_Firmware

Technical documentation

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Type Title Date
* Design guide Fire, CO Alarm Detector Ref Design w/ Low BOM Cost and Integrated Battery Backup Oct. 10, 2017

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