參數(shù)資料
型號： TSC2100IRHBRG4
廠商： TEXAS INSTRUMENTS INC
元件分類： 消費家電
英文描述： SPECIALTY CONSUMER CIRCUIT, PQCC32
封裝： 5 X 5 MM, GREEN, PLASTIC, QFN-32
文件頁數(shù)： 8/77頁
文件大小： 1079K
代理商： TSC2100IRHBRG4
TSC2100
SLAS378 NOVEMBER 2003
www.ti.com
16
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 15. 4-Wire Touch Screen Construction
The 4-wire touch screen panel works by applying a voltage across the vertical or horizontal resistive network. The A/D
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 a A/D converter, 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 A/D
converter.
Voltage is then applied to the other axis, and the A/D 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 TSC2100. 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 function; 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 TSC2100 supports two methods. The first method requires
knowing the X-plate resistance, measurement of the X-Position, and two additional cross panel measurements (Z2and Z1)
of the touch screen (see Figure 16). Using equation 1 calculates the touch resistance:
RTOUCH + RX–plate
X–position
4096
Z2
Z1
–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:
RTOUCH +
RXplate
Xposition
4096
Z1
* 1
* RYplate
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 16. 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) 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 pressed. This settling time must be accounted for,
or else the converted value is in error. Therefore, a delay must be introduced between the time the driver for a particular
measurement is turned on, and the time measurement is made.
(1)
(2)
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TSC2100IRHBRMULT1 制造商:Texas Instruments 功能描述:
TSC2101 制造商:TI 制造商全稱:Texas Instruments 功能描述:AUDIO CODEC WITH INTERATED HEADPHONE SPEAKER AMPLIFIER AND TOUCH SCREEN CONTROLLER
TSC2101_07 制造商:TI 制造商全稱:Texas Instruments 功能描述:AUDIO CODEC WITH INTEGRATED HEADPHONE, SPEAKER AMPLIFIER AND TOUCH SCREEN CONTROLLER
TSC2101_08 制造商:TI 制造商全稱:Texas Instruments 功能描述:AUDIO CODEC WITH INTEGRATED HEADPHONE, SPEAKER AMPLIFIER AND TOUCH SCREEN CONTROLLER
TSC2101EVM 功能描述:顯示開發(fā)工具 TSC2101 Eval Mod RoHS:否 制造商:4D Systems 產(chǎn)品:4Display Shields 工具用于評估:?OLED-160-G1, ?OLED-160-G2 接口類型:Serial 工作電源電壓:5 V
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