使開關更聰明與真正的微霍爾效應傳感器

　　線性霍爾效應傳感器可以給消費者帶來物聯網技術和物聯網應用的寶貴優勢，但必須實現功耗顯著降低，才能滿足設備設計者和最終用戶的期望

　　更好的感知是進步的關鍵

　　改善傳感是至關重要的，以提供改進的用戶體驗，如智能手機，攝像頭和游戲控制器的消費設備的需求，也需要實現物聯網的潛力（物聯網）。在消費者應用中，需要多功能智能按鈕來支持復雜的交互和基于手勢的控件。在物聯網，感知分鐘運動或位置差異的能力，使控制器能夠準確地推斷資產狀況。在智能建筑的安全系統中，例如，一個基本的傳感器可以檢測到一個窗口是否關閉，而一個更聰明的傳感器可以通知系統是否該窗口被鎖定或解鎖。

　　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.