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參數資料
| 型號： | TSC2008IRGVR |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 消費家電 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PQCC16 |
| 封裝： | 4 X 4 MM, GREEN, PLASTIC, VQFN-16 |
| 文件頁數： | 4/40頁 |
| 文件大小： | 1028K |
| 代理商： | TSC2008IRGVR |
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TOUCH SCREEN OPERATION
4-WIRE TOUCH SCREEN COORDINATE PAIR MEASUREMENT
ConductiveBar
InsulatingMaterial(Glass)
Silver
Ink
TransparentConductor(ITO)
BottomSide
Transparent
Conductor(ITO)
TopSide
X+
X-
Y+
Y-
ITO=IndiumTinOxide
R
TOUCH
+ RXplate @
X
Postition
4096
Z
2
Z
1
* 1
(1)
SBAS406B – JUNE 2008 – REVISED MARCH 2009.......................................................................................................................................................... www.ti.com
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.
The TSC2008 supports 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.
Figure 21. 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 converter 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 a data converter chip, turning on the Y+
and 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 because of the high input impedance of the A/D converter.
Voltage is then applied to the other axis, and the A/D converter converts the voltage representing the X position
on the screen. This process provides the X and Y coordinates to the associated processor.
Measuring touch pressure (Z) can also be done with the TSC2008. To determine pen or finger touch, the
pressure of the touch must be determined. Generally, it is not necessary to have very high performance for this
test; therefore, 8-bit resolution mode may be sufficient (however, data sheet calculations are shown using 12-bit
resolution mode). There are several different ways of performing this measurement. The TSC2008 supports two
methods. The first method requires knowing the X-plate resistance, the measurement of the X-Position, and two
additional cross panel measurements (Z2 and Z1) of the touch screen (see Figure 22). Equation 1 calculates the
touch resistance:
12
Copyright 2008–2009, Texas Instruments Incorporated
Product Folder Link(s): TSC2008
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相關代理商/技術參數 |
參數描述 |
|---|---|
| TSC2008IRGVT | 功能描述:觸摸屏轉換器和控制器 Nano-Pwr Touch Screen Controller RoHS:否 制造商:Microchip Technology 類型:Resistive Touch Controllers 輸入類型:3 Key 數據速率: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 |
| TSC2008IYZGR | 功能描述:觸摸屏轉換器和控制器 Nano-Pwr Touch Screen Controller RoHS:否 制造商:Microchip Technology 類型:Resistive Touch Controllers 輸入類型:3 Key 數據速率: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 |
| TSC2008IYZGT | 功能描述:觸摸屏轉換器和控制器 Nano-Pwr Touch Screen Controller RoHS:否 制造商:Microchip Technology 類型:Resistive Touch Controllers 輸入類型:3 Key 數據速率: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 |
| TSC2008-Q1 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:1.2V to 3.6V, 12-Bit, Nanopower, 4-Wire Micro TOUCH SCREEN CONTROLLER with SPIa?￠ |
| TSC2008RGVR | 制造商:TI 制造商全稱:Texas Instruments 功能描述:1.2V to 3.6V, 12-Bit, Nanopower, 4-Wire Micro TOUCH SCREEN CONTROLLER with SPI? |
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