使開關更聰明與真正的微霍爾效應傳感器

　　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(lián)網(wǎng)技術和物聯(lián)網(wǎng)應用的寶貴優(yōu)勢，但必須實現(xiàn)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(xiàn)物聯(lián)網(wǎng)的潛力（物聯(lián)網(wǎng)）。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(lián)網(wǎng)，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(chǎn)狀況。在智能建筑的安全系統(tǒng)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(tǒng)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.