New Touch-Screen Controllers Offer Robust Sensing for Portable Displays

Analog Devices

Touch-screen displays that sense the occurrence and location of a physical touch on the display area are increasingly being used to replace mechanical buttons in a variety of devices, including smartphones, MP3 players, GPS navigation systems, digital cameras, laptop computers, video games, and laboratory instruments. First generation devices were not very accurate, suffered from false detection, and consumed too much power. Newer touch-screen controllers,1 such as the AD7879,2 offer improved accuracy, lower power consumption, and result filtering. They can also sense temperature, supply voltage, and touch pressure, facilitating robust sensing for modern touch-screen displays.