DESCRIPTION
The TSC2005 is a very low-power touch screen controller designed to work with power-sensitive, hand held applications that are based on an advanced low-voltage processor. It works with a supply voltage as low as 1.6V, which can be supplied by a single-cell battery. It contains a complete, ultralow-power, 12-bit, analog-to-digital (A/D)resistive touch screen converter, including drivers and the control logic to measur etouch pressure.

Page - 15. Variable Resolution
The TSC2005 provides either 10-bit or 12-bit resolution for the A/D converter. Lower resolution is often practical
for measuring slow changing signals such as touch pressure. Performing the conversions at lower resolution
reduces the amount of time it takes for the A/D converter to complete its conversion process, which also lowers power consumption.

Page 11. - TOUCH SCREEN OPERATION
A resistive touch screen operates by applying a voltage across a resistor network and measuring the change in
resistance at a given point on the matrix where the screen is touched by an input (stylus, pen, or finger). The
change in the resistance ratio marks the location on the touch screen.

4-WIRE TOUCH SCREEN COORDINATE PAIR MEASUREMENT
The TSC2005 supports the resistive 4-wire configurations, as shown in Figure 21. The circuit determines location
in two coordinate pair dimensions, although a third dimension can be added for measuring pressure.
A 4-wire touch screen is typically constructed as shown in Figure 21. It consists of two transparent resistive
layers separated by insulating spacers. The 4-wire touch screen panel works by applying a voltage across the vertical or horizontal resistive network. The A/D converter converts the voltage measured at the point where the panel is touched.