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参数资料
| 型号： | TSC2300IPAGRG4 |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 消费家电 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PQFP64 |
| 封装： | GREEN, PLASTIC, TQFP-64 |
| 文件页数： | 9/83页 |
| 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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相关代理商/技术参数 |
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|---|---|
| TSC2301 | 制造商:TI 制造商全称:Texas Instruments 功能描述:PROGRAMMABLE TOUCH SCREEN CONTROLLER WITH STEREO AUDIO CODEC |
| TSC2301EVM | 功能描述:触摸传感器开发工具 TSC2301 Eval Mod RoHS:否 制造商:Cypress Semiconductor 工具用于评估: 接口类型: 工作电压: 最大工作温度: |
| TSC2301IGQZ | 功能描述:触摸屏转换器和控制器 Prog 4-Wire w/20-Bit Stereo Audio Codec RoHS:否 制造商:Microchip Technology 类型:Resistive Touch Controllers 输入类型:3 Key 数据速率:140 SPS 分辨率:10 bit 接口类型:4-Wire, 5-Wire, 8-Wire, I2C, SPI 电源电压:2.5 V to 5.25 V 电源电流:17 mA 工作温度:- 40 C to + 85 C 封装 / 箱体:SSOP-20 |
| TSC2301IGQZR | 功能描述:触摸屏转换器和控制器 Prog 4-Wire w/20-Bit Stereo Audio Codec RoHS:否 制造商:Microchip Technology 类型:Resistive Touch Controllers 输入类型:3 Key 数据速率:140 SPS 分辨率:10 bit 接口类型:4-Wire, 5-Wire, 8-Wire, I2C, SPI 电源电压:2.5 V to 5.25 V 电源电流:17 mA 工作温度:- 40 C to + 85 C 封装 / 箱体:SSOP-20 |
| TSC2301IPAG | 功能描述:触摸屏转换器和控制器 Prog 4-Wire w/20-Bit Stereo Audio Codec RoHS:否 制造商:Microchip Technology 类型:Resistive Touch Controllers 输入类型:3 Key 数据速率:140 SPS 分辨率:10 bit 接口类型:4-Wire, 5-Wire, 8-Wire, I2C, SPI 电源电压:2.5 V to 5.25 V 电源电流:17 mA 工作温度:- 40 C to + 85 C 封装 / 箱体:SSOP-20 |
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