參數(shù)資料
型號(hào)： TSC2302IRGZRG4
廠商： TEXAS INSTRUMENTS INC
元件分類： 消費(fèi)家電
英文描述： SPECIALTY CONSUMER CIRCUIT, PQCC48
封裝： GREEN, PLASTIC, VQFN-48
文件頁(yè)數(shù)： 6/85頁(yè)
文件大小： 1483K
代理商： TSC2302IRGZRG4
www.ti.com
Conductive Bar
Transparent Conductor (ITO)
Bottom Side
X+
X–
Y+
Y–
Transparent Conductor (ITO)
Top Side
Insulating Material (Glass)
ITO= Indium Tin Oxide
Silver Ink
R
TOUCH +
R
X–plate
X–position
4096
Z
2
Z
1
* 1
(1)
R
TOUCH +
R
X–plate
X–position
4096
Z
1
* 1 * RY–plate 1 *
Y–position
4096
(2)
TSC2302
SLAS394 – JULY 2003
DETAILED DESCRIPTION (continued)
The TSC2302 supports the resistive 4-wire configuration. The circuit determines the location in two coordinate
pair dimensions, although a third dimension can be added for measuring pressure.
The 4-Wire Touch Screen Coordinate Pair Measurement
A 4-wire touch screen is constructed as shown in Figure 40. It consists of two transparent resistive layers
separated by insulating spacers.
Figure 40. 4-Wire Touch Screen Construction
The 4-wire touch screen panel works by applying a voltage across the vertical or horizontal resistive network.
The ADC converts the voltage measured at the point where the panel is touched. A measurement of the Y
position of the pointing device is made by connecting the X+ input to the ADC input, driving Y+ to +VDD and Y-
to GND using switches internal to the TSC2302, and digitizing the voltage seen at the X+ input. The voltage
measured is determined by the voltage divider developed at the point of touch. For this measurement, the
horizontal panel resistance in the X+ lead does not affect the conversion, due to the high input impedance of the
ADC.
Voltage is then applied to the other axis, and the ADC converts the voltage representing the X position on the
screen. This provides the X and Y coordinates to the associated processor.
Measuring touch pressure (Z) can also be done with the TSC2302. To determine pen or finger touch, the
pressure of the touch needs to be determined. Generally, it is not necessary to have very high performance for
this test, therefore, the 8-bit resolution mode is recommended (however, calculations are shown with the 12-bit
resolution mode). There are several different ways of performing this measurement. The TSC2302 supports two
methods. The first method requires knowing the X-plate resistance, measurement of the X-position, and two
additional cross panel measurements (Z2 and Z1) of the touch screen (see Figure 41). Using Equation 1
calculates the touch resistance:
The second method requires knowing both the X-plate and Y-plate resistance, measurement of X-position and
Y-position, and Z1. Using Equation 2 also calculates the touch resistance:
14
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