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手持式触摸屏应用程序设计成接近传感器
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2011-12-01
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Abstract: This application note discusses the advantages of using the Maxim MAX44000 proximity sensors in handheld touch-screen
applications. It then addresses a few application considerations. These include reducing crosstalk, improving noise immunity, and
reducing the load on the application processor in the system. Sample C code for threshold hysteresis is available in the appendix.
Why Use Proximity Sensors?
Touch screens can be found in various handheld electronic devices, not the least of which are smartphones. While touch screens
greatly improve a device's functionality, they present several new challenges. This includes knowing how and when to interpret
interaction with the touch screen. For example, the screen must interpret how to react when the phone is against a user's face;
inadvertent contact with the ear or cheek can be wrongly interpreted as desired user input.
The most popular way to get around this problem—and simultaneously add to the device's capabilities—is to integrate a proximity
sensor into the phone. This sensor can turn off the touch screen when the proximity reading is sufficiently large and the user is on
the phone.
Devices containing infrared-based proximity sensors with digital outputs, such as the MAX44000, make this task relatively simple,
compared to discrete solutions.
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