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| 型號(hào)： | TSC2300IPAGRG4 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類(lèi)： | 消費(fèi)家電 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PQFP64 |
| 封裝： | GREEN, PLASTIC, TQFP-64 |
| 文件頁(yè)數(shù)： | 9/83頁(yè) |
| 文件大小： | 1268K |
| 代理商： | TSC2300IPAGRG4 |
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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)
TSC2300
SLAS372 — NOVEMBER 2002
DETAILED DESCRIPTION
OPERATION - TOUCH SCREEN
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 TSC2300 supports the resistive 4-wire configuration (see Figure 44). The circuit determines 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 45. It consists of two transparent resistive layers separated by
insulating spacers.
Figure 45. 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 where the panel is touched. A measurement of the Y position of the
pointing device is made by connecting the X+ input to A/D converter input, driving Y+ to +VDD and Y- to GND using
switches internal to the TSC2300, 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 TSC2300. 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 TSC2300 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 46). 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 will also calculate the touch resistance:
17
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TSC2301 | 制造商:TI 制造商全稱(chēng):Texas Instruments 功能描述:PROGRAMMABLE TOUCH SCREEN CONTROLLER WITH STEREO AUDIO CODEC |
| TSC2301EVM | 功能描述:觸摸傳感器開(kāi)發(fā)工具 TSC2301 Eval Mod RoHS:否 制造商:Cypress Semiconductor 工具用于評(píng)估: 接口類(lèi)型: 工作電壓: 最大工作溫度: |
| TSC2301IGQZ | 功能描述:觸摸屏轉(zhuǎn)換器和控制器 Prog 4-Wire w/20-Bit Stereo Audio Codec RoHS:否 制造商:Microchip Technology 類(lèi)型:Resistive Touch Controllers 輸入類(lèi)型:3 Key 數(shù)據(jù)速率:140 SPS 分辨率:10 bit 接口類(lèi)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 |
| TSC2301IGQZR | 功能描述:觸摸屏轉(zhuǎn)換器和控制器 Prog 4-Wire w/20-Bit Stereo Audio Codec RoHS:否 制造商:Microchip Technology 類(lèi)型:Resistive Touch Controllers 輸入類(lèi)型:3 Key 數(shù)據(jù)速率:140 SPS 分辨率:10 bit 接口類(lèi)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 |
| TSC2301IPAG | 功能描述:觸摸屏轉(zhuǎn)換器和控制器 Prog 4-Wire w/20-Bit Stereo Audio Codec RoHS:否 制造商:Microchip Technology 類(lèi)型:Resistive Touch Controllers 輸入類(lèi)型:3 Key 數(shù)據(jù)速率:140 SPS 分辨率:10 bit 接口類(lèi)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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