使开关更聪明与真正的微霍尔效应传感器

　　使开关更聪明与真正的微霍尔效应传感器

　　线性霍尔效应传感器可以给消费者带来物联网技术和物联网应用的宝贵优势，但必须实现功耗显著降低，才能满足设备设计者和最终用户的期望

　　更好的感知是进步的关键

　　改善传感是至关重要的，以提供改进的用户体验，如智能手机，摄像头和游戏控制器的消费设备的需求，也需要实现物联网的潜力（物联网）。在消费者应用中，需要多功能智能按钮来支持复杂的交互和基于手势的控件。在物联网，感知分钟运动或位置差异的能力，使控制器能够准确地推断资产状况。在智能建筑的安全系统中，例如，一个基本的传感器可以检测到一个窗口是否关闭，而一个更聪明的传感器可以通知系统是否该窗口被锁定或解锁。

　　Linear Hall-effect sensors provide a means to achieve more sophisticated sensing compared to alternatives such as mechanical switches， which are often the incumbent technology in computer accessories like joysticks， or game controllers. Linear Hall-effect sensors deliver a non-contact position sensing solution that is highly reliable and convenient to design in. Moreover， compared to other non-contact sensing devices such as optical sensors， the linear Hall-effect device is not susceptible to errors that can be caused by obscuring of the optical windows by dust or other contaminants. Linear Hall-effect sensors are already widely used in numerous industrial applications， for example for sensing the position of rotary valves.

　　The Hall-effect and linear sensors

　　The Hall-effect refers to the measurable voltage developed across a conductor when a magnetic field acts on an electric current flowing in the conductive material. This voltage is proportional to the current flowing and the magnetic flux perpendicular to the conductor， as Figure 1 illustrates. Hall-effect sensor ICs integrate high-gain amplification and other signal-conditioning circuitry such as offset cancellation to generate an output that is representative of the magnetic flux detected， at voltages that are compatible with other logic or analog circuitry.