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| 型号： | TSC2046IRGVT |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 消费家电 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PQCC16 |
| 封装： | 4 X 4 MM, 1MM HEIGHT, GREEN, PLASTIC, QFN-16 |
| 文件页数： | 6/33页 |
| 文件大小： | 774K |
| 代理商： | TSC2046IRGVT |
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TSC2046
SBAS265G OCTOBER 2002 REVISED JANUARY 2008
www.ti.com
14
PRESSURE MEASUREMENT
Measuring touch pressure can also be done with the
TSC2046. 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 will be shown here in the 12-bit
resolution mode). There are several different ways of
performing this measurement. The TSC2046 supports two
methods. The first method requires knowing the X-plate
resistance, measurement of the X-Position, and two
additional cross panel measurements (Z1 and Z2) of the
touch screen, as shown in Figure 8. Using Equation (3)
calculates the touch resistance:
R
TOUCH +
R
XPlate
@ XPosition
4096
Z
2
Z
1
*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 (4) also calculates
the touch resistance:
R
TOUCH +
R
XPlate
@ XPosition
4096
Z
1
*1
*R
YPlate 1
* YPosition
4096
DIGITAL INTERFACE
See Figure 9 for the typical operation of the TSC2046
digital interface. This diagram assumes that the source of
the digital signals is a microcontroller or digital signal
processor
with
a
basic
serial
interface.
Each
communication between the processor and the converter,
such as SPI, SSI, or Microwire
t synchronous serial
interface, consists of eight clock cycles. One complete
conversion can be accomplished with three serial
communications for a total of 24 clock cycles on the DCLK
input.
The first eight clock cycles are used to provide the control
byte via the DIN pin. When the converter has enough
information about the following conversion to set the input
multiplexer and reference inputs appropriately, the
converter enters the acquisition (sample) mode and, if
needed, the touch panel drivers are turned on. After three
more clock cycles, the control byte is complete and the
converter enters the conversion mode. At this point, the
input sample-and-hold goes into the hold mode and the
touch panel drivers turn off (in single-ended mode). The
next 12 clock cycles accomplish the actual analog-
to-digital conversion. If the conversion is ratiometric
(SER/DFR = 0), the drivers are on during the conversion
and a 13th clock cycle is needed for the last bit of the
conversion result. Three more clock cycles are needed to
complete the last byte (DOUT will be low), which are
ignored by the converter.
Microwire is a registered trademark of National Semiconductor.
XPosition
Measure
XPosition
Touch
X+
Y+
X
Y
Measure
Z
1Position
Z
1Position
Touch
X+
Y+
Y
X
Measure
Z
2Position
Z
2Position
Touch
X+
Y+
Y
X
Figure 8. Pressure Measurement Block Diagrams
(3)
(4)
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相关代理商/技术参数 |
参数描述 |
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| TSC2046IRGVTG4 | 功能描述:触摸屏转换器和控制器 4-Wire w/low voltage digital I/O 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 |
| TSC2046IZQCR | 功能描述:触摸屏转换器和控制器 4-Wire w/low voltage digital I/O 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 |
| TSC2046IZQCR-90 | 功能描述:触摸屏转换器和控制器 4-Wire w/low voltage digital I/O 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 |
| TSC2046IZQCT | 功能描述:触摸屏转换器和控制器 4-Wire w/low voltage digital I/O 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 |
| TSC2059 | 制造商:TSC 制造商全称:Taiwan Semiconductor Company, Ltd 功能描述:General Purpose NPN Transistor |
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