概览
描述
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.
特性
- 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
产品对比
应用
设计和开发
开发板与套件
家用烟雾探测器开发板
光电烟雾探测器由一个红外光电二极管(发射器)和一个光电晶体管(接收器/探测器)组成,安装在所谓的“小白盒”内。 空气在盒子内流动,而空气中可能含有来自附近(早期)明火的烟雾,等等。
”小白盒“的结构可防止(日)光进入盒子,以免干扰测量。 由于发射器和探测器都位于 ~120 至 150 度的角度,因此光线不会在未受污染或“低污染”的空气中照射到传感器。 但是,如果(例如,由于烟雾或灰尘)盒子中的空气含有颗粒,光会散射,有些光会照射到探测器,从而触发声音警报(压电喇叭、蜂鸣器)。
该款烟雾探测器设计采用了瑞萨的 RAA239101 低功耗模拟前端(AFE)IC 和 RL78/G12...
远程测试该板卡
模型
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