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參數(shù)資料
| 型號： | TSC2300IPAGRG4 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 消費家電 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PQFP64 |
| 封裝： | GREEN, PLASTIC, TQFP-64 |
| 文件頁數(shù)： | 10/83頁 |
| 文件大?。?/td> | 1268K |
| 代理商： | TSC2300IPAGRG4 |
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Z
2–Position
Touch
X+
X–
Y+
Y–
X-Position
Touch
Measure X-Position
Measure Z1-Position
X+
X–
Z-Position
Touch
Y+
Y–
X+
X–
Y+
Y–
Measure Z2-Position
TSC2300
SLAS372 — NOVEMBER 2002
Figure 46. Pressure Measurement
When the touch panel is pressed or touched, and the drivers to the panel are turned on, the voltage across the touch
panel often overshoots and then slowly settles (decay) 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 panel when the panel is pressed. This settling time
must be accounted for, or else the converted value is 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.
In some applications, external capacitors may be required across the touch screen for filtering noise picked up by the
touch screen, i.e. noise generated by the LCD panel or back-light circuitry. The value of these capacitors provides a
low-pass filter to reduce the noise, but causes an additional settling time requirement when the panel is touched.
Several solutions to this problem are available in the TSC2300. A programmable delay time is available which sets the
delay between turning the drivers on and making a conversion. This is referred to as the panel voltage stabilization
time, and is used in some of the modes available in the TSC2300. In other modes, the TSC2300 can be commanded
to turn on the drivers only without performing a conversion. Time can then be allowed before the command is issued to
perform a conversion.
The TSC2300 touch screen interface can measure position (X,Y) and pressure (Z). Determination of these coordinates
is possible under three different modes of the A/D converter: conversion controlled by the TSC2300, initiated by
detection of a touch; conversion controlled by the TSC2300, initiated by the host responding to the PENIRQ signal; or
conversion completely controlled by the host processor.
A/D CONVERTER
The analog inputs of the TSC2300 are shown in Figure 47. The analog inputs (X, Y, and Z touch panel coordinates,
battery voltage monitors, chip temperature and auxiliary inputs) are provided via a multiplexer to the successive
approximation register (SAR) analog-to-digital (A/D) converter. The A/D architecture is based on capacitive
redistribution architecture which inherently includes a sample/hold function.
A unique configuration of low on-resistance switches allows an unselected ADC input channel to provide power and an
accompanying pin to provide ground for driving the touch panel. By maintaining a differential input to the converter and
a differential reference input architecture, it is possible to negate errors caused by the driver switch on-resistances.
The A/D is controlled by an A/D converter control register. Several modes of operation are possible, depending upon
the bits set in the control register. Channel selection, scan operation, averaging, resolution, and conversion rate may
all be programmed through this register. These modes are outlined in the sections below for each type of analog input.
The results of conversions made are stored in the appropriate result register.
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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:Texas Instruments 功能描述:PROGRAMMABLE TOUCH SCREEN CONTROLLER WITH STEREO AUDIO CODEC |
| TSC2301EVM | 功能描述:觸摸傳感器開發(fā)工具 TSC2301 Eval Mod RoHS:否 制造商:Cypress Semiconductor 工具用于評估: 接口類型: 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 |
| 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 |
| 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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