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參數(shù)資料
| 型號(hào)： | TSC2117IRGZT |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 消費(fèi)家電 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, QCC48 |
| 封裝： | 7 X 7 MM, GREEN, PLASTIC, VQFN-48 |
| 文件頁(yè)數(shù)： | 157/192頁(yè) |
| 文件大?。?/td> | 2728K |
| 代理商： | TSC2117IRGZT |
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5.7.1
The Four-Wire Resistive Touch Screen
TransparentConductor(ITO)
TopSide
TransparentConductor(ITO)
BottomSide
ConductiveBar
SilverInk
InsulatingMaterial
(Glass)
Y+
X+
Y–
X–
ITO=Indium TinOxide
M0068-01
TSC2117
Low-Power Audio Codec With Embedded miniDSP, Stereo Class-D
Speaker Amplifier, and Smart Four-Wire Touch-Screen Controller
www.ti.com
SLAS550A – APRIL 2009 – REVISED JUNE 2009
A resistive touch screen works by applying a voltage across a resistor network and measuring the change
in resistance at a given point on the matrix where a screen is touched by an input stylus, pen, or finger.
The change in the resistance ratio marks the location on the touch screen.
The TSC2117 supports the resistive four-wire configurations (see Figure 5-37). The circuit determines
location in two coordinate-pair dimensions.
A four-wire touch screen is constructed as shown in Figure 5-37. It consists of two transparent resistive
layers separated by insulating spacers.
Figure 5-37. Four-Wire Touch-Screen Construction
The four-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 screen 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.
When the touch screen is pressed or touched and the drivers to the panel are turned on, the voltage
across the touch screen 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 screen
when it is pressed. This settling time must be accounted for, or else the converted value will be 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.
APPLICATION INFORMATION
67
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TSC2117IRGZT | 制造商:Texas Instruments 功能描述:Touch Screen Controller IC |
| TSC22 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:EURO TERMINAL BLOCKS |
| TSC2200 | 制造商:BB 制造商全稱:BB 功能描述:PDA ANALOG INTERFACE CIRCUIT |
| TSC2200EVM | 功能描述:觸摸傳感器開發(fā)工具 Touch Screen Contr Eval Mod RoHS:否 制造商:Cypress Semiconductor 工具用于評(píng)估: 接口類型: 工作電壓: 最大工作溫度: |
| TSC2200IPW | 功能描述:觸摸屏轉(zhuǎn)換器和控制器 Prog 4-Wire w/12-Bit 125KHz ADC & Key Ifc RoHS:否 制造商:Microchip Technology 類型:Resistive Touch Controllers 輸入類型:3 Key 數(shù)據(jù)速率:140 SPS 分辨率:10 bit 接口類型:4-Wire, 5-Wire, 8-Wire, I2C, SPI 電源電壓:2.5 V to 5.25 V 電源電流:17 mA 工作溫度:- 40 C to + 85 C 封裝 / 箱體:SSOP-20 |
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