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參數(shù)資料
| 型號： | UCB1300BE |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 調制器/解調器 |
| 英文描述： | Advanced modem/audio analog front-end |
| 中文描述： | MODEM-SUPPORT CIRCUIT, PQFP48 |
| 封裝： | 7 X 7 MM, 1.40 MM HEIGHT, PLASTIC, SOT-313-2, LQFP-48 |
| 文件頁數(shù)： | 15/56頁 |
| 文件大小： | 1022K |
| 代理商： | UCB1300BE |
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1999 Jul 20
15
Philips Semiconductors
Preliminary specification
Advanced modem/audio analog front-end
UCB1300
PRESSURE MEASUREMENT
The pressure used to press the touch screen can be determined. In fact the contact resistance between the X and Y plate
is measured, which is a good indication of the size of the pressed spot and the applied pressure. A soft stylus, e.g. a
finger, leads to a rather large contact area between the two plates when a large pressure is applied. A hard stylus, e.g.
a pen, leads to less variation in measured contact resistance since the contact area is rather small.
One plate is biased at one or both terminals during this pressure measurement, whereas the other plate is grounded,
again on one or both terminals. The current flowing through the touch screen is a direct indication for the resistance
between both plates. A compensation for the series resistance, formed by the touch screen plates itself will improve the
accuracy of this measurement. The measurement is done with a resistive voltage divider. The internal resistor should be
taken into account to evaluate the settling time of the pressure measurement given the board capacitors connected to
the ADC tap point in pressure mode.
Vtscbias
Fig.9 Touch screen setup for pressure measurement.
Vtscbias
tspx
tsmx
tspy
tsmy
ipressure
Fig.9 Pressure measurement scheme.
S
Measured resistor
Internal resistor (about 1k
)
To ADC
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| UCB1400 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Audio codec with touch screen controller and power management monitor |
| UCB1400BE | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Audio codec with touch screen controller and power management monitor |
| UCB1400BE,128 | 功能描述:接口—CODEC AUDIO CODEC WITH TOUCHSCREEN RoHS:否 制造商:Texas Instruments 類型: 分辨率: 轉換速率:48 kSPs 接口類型:I2C ADC 數(shù)量:2 DAC 數(shù)量:4 工作電源電壓:1.8 V, 2.1 V, 2.3 V to 5.5 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:DSBGA-81 封裝:Reel |
| UCB1400BE,151 | 功能描述:接口—CODEC AUDIO CODEC RoHS:否 制造商:Texas Instruments 類型: 分辨率: 轉換速率:48 kSPs 接口類型:I2C ADC 數(shù)量:2 DAC 數(shù)量:4 工作電源電壓:1.8 V, 2.1 V, 2.3 V to 5.5 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:DSBGA-81 封裝:Reel |
| UCB1400BE,157 | 功能描述:接口—CODEC DO NOT USE ORDER -S OR -T PART RoHS:否 制造商:Texas Instruments 類型: 分辨率: 轉換速率:48 kSPs 接口類型:I2C ADC 數(shù)量:2 DAC 數(shù)量:4 工作電源電壓:1.8 V, 2.1 V, 2.3 V to 5.5 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:DSBGA-81 封裝:Reel |
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