Overview
Description
This reference design offers a multiwavelength smoke detector for commercial buildings. The board consists only of the RL78/G22 microcontroller, an analog front-end (AFE), LEDs, photodiodes, and several external components. Additionally, by utilizing the SNOOZE mode sequencer (SMS) of the RL78/G22, it enables ultra-low power consumption and high-precision smoke detection, allowing for a compact multi-wavelength smoke detector design.
Features
- Compact, low-power, high-performance MCU
- Integrated low-power AFE for photoelectric smoke detection that contains all necessary peripherals
- Minimal external components, achieving the lowest BOM and a smaller size
Applications
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Smoke Detector for Commercial Buildings
Commerical smoke detector system for fire alarms achieves ultra-low power consumption with a simple configuration.
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Documentation
Featured Documentation
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| Type | Title | Date |
| PCB Design Files | RTK7RL22SMD00000BJ Design Files
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| Quick Start Guide |
PDF
1.29 MB
日本語
Provides a quick start overview for the RL78/G22 multiwavelength smoke detector evaluation board. Explains initial hardware setup, system configuration, and sample software operation to help developers evaluate multiwavelength smoke detection using the RL78/G22 microcontroller and accelerate early proof-of-concept development.
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| Application Note |
PDF
895 KB
日本語
Describes a reference design for a multiwavelength photoelectric smoke detector using the RL78/G22 microcontroller and RAA23910X analog front end. This application note explains system architecture, operating principles, detection algorithms, and smoke test results to help developers design, evaluate, and tune high-accuracy, low-power smoke detector systems.
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| Manual - Software |
PDF
1.22 MB
日本語
Describes the sample firmware for the RL78/G22 multiwavelength smoke detector evaluation board. This user’s software manual explains software architecture, processing flow, peripheral configuration, and operational modes to support firmware evaluation, customization, and integration with the evaluation hardware.
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| Manual - Development Tools |
PDF
3.74 MB
日本語
Describes the RL78/G22 multiwavelength smoke detector evaluation board. This user’s hardware manual explains board architecture, component functions, power configurations, interfaces, and electrical characteristics to support hardware evaluation, system design, and integration of photoelectric smoke detector applications.
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5 items
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Design & Development
Software & Tools
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Lab on the Cloud
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Product Options
| Part Number | Status | Sampleable |
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| RTK7RL22SMD00000BJ | Active | Available |
Videos & Training
This video introduces a highly sensitive, ultra-low power smoke detector solution. It covers the types of smoke detectors, various detection methods, and a multi-LED smoke detector solution designed to meet the updated UL standards.
Additional Videos
News & Blog Posts
Blog Post Oct 27, 2025 |
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