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...
可在云上实验室使用
使用我们基于 PC 的 GUI，无需物理板即可在虚拟实验室中立即开始配置和测试设计
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
- Photoelectric smoke detectors
设计和开发
开发板与套件
模型
ECAD 模块
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