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參數(shù)資料
| 型號(hào)： | TSC2111IRGZTG4 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 0.4 W, 1 CHANNEL, AUDIO AMPLIFIER, QCC48 |
| 封裝： | PLASTIC, QFN-48 |
| 文件頁數(shù)： | 30/99頁 |
| 文件大?。?/td> | 1143K |
| 代理商： | TSC2111IRGZTG4 |
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TSC2111
SLAS495A JUNE 2006 REVISED OCTOBER 2007
www.ti.com
36
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
Figure 25. 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 the panel is touched. A measurement of the Y position
of the pointing device is made by connecting the X+ input to an ADC, turning on the Y drivers, 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 TSC2111. 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 TSC2111
supports two methods. The first method requires knowing the X-plate resistance, measurement of the
X-Position, and two additional cross panel measurements (Z 2 and Z1) of the touch screen (see Figure 26).
Using Equation (1) calculates the touch resistance:
R
TOUCH +
R
X–plate
X–position
4096
Z
2
Z
1
–1
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:
R
TOUCH +
R
Xplate
Xposition
4096
Z
1
* 1
* R
Yplate
1
*
Yposition
4096
i
Measure X-Position
Y+
Y
X-Position
X
X+
Touch
Measure Z1-Position
Touch
Y+
Y
X
X+
Z1-Position
Y+
Y
X
X+
Touch
Z2-Position
Measure Z2-Position
Figure 26. Pressure Measurement
When the touch panel is pressed or touched, and the drivers to the panel are turned on, the voltage across the
touch panel often overshoots and then slowly settles (decays) down to a stable DC value. This is due to
mechanical bouncing which is caused by vibration of the top layer sheet of the touch panel when the panel is
(1)
(2)
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