Renesas RAA239101

The highly integrated RAA239101 low-power Analog Frontend (AFE) IC includes peripherals & features required for a photoelectric smoke detector system, mainly focused on residential smoke detector designs. Therefore, it is very simple and straightforward to realize a complete photoelectric smoke detector electronics circuitry with only two key components: MCU + AFE.

The Renesas Winning Combination "EU070 - Household Smoke Detector" demonstrates the simplicity & functionality of such a compact smoke detector design.

Key features

• Extend battery life due to ultra-low power consumption in Sleep Mode
• Reduce overall BOM cost by integrating multiple functions usually done by discrete devices
• Dual Channel allows two different IR Wavelength LEDs/photodetectors to increase accuracy
• 10-bit ADC for measuring voltage on 7 analog pins

Additional features

• Ultra-low power consumption
• 9 V or 3.3 V 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 45 mA to 600 mA
• Two photodiode receivers with programmable gain amplifiers
• General-purpose I/O (GPIO)
• Horn driver with clamp diodes
• SPI interface

Applications

• Smoke detectors based on photoelectric detection principle

Available Tools 

The Renesas winning combination "EU070 - Household Smoke Detector" is available as proof-of-concept hardware. It demonstrates the simplicity and functionality of such a compact and cost-effective smoke detector design. Users can instantly test and evaluate this Board via Lab on the Cloud. 

• Key Functionality:
  • Fully operational residential smoke detector (photoelectric principle)
  • Battery-powered (3 V or 9 V) and optional AC mains supply
  • Mechanical smoke chamber (3D print)

• Benefits:
  • Complete smoke detector system with only two key components (RL78 MCU and AFE)
  • Ultra-low current consumption enables 10+ years battery lifetime
  • Cost-optimized BOM enabling compact solutions

• Available Resources:
  • PoC board, firmware, documentation
  • Available at Lab on the Cloud: www.renesas.com/labonthecloud