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參數(shù)資料
| 型號： | TSC2101IRGZRG4 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 消費(fèi)家電 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PQCC48 |
| 封裝： | GREEN, PLASTIC, VQFN-48 |
| 文件頁數(shù)： | 27/95頁 |
| 文件大小： | 1217K |
| 代理商： | TSC2101IRGZRG4 |
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TSC2101
SLAS392D JUNE 2003 REVISED MAY 2005
www.ti.com
33
Analog Mixer
The analog mixer can be used to route the analog input selected for the ADC through an analog volume control
and then mix it with the audio DAC output. The analog mixer feature is available only if the single ended
microphone input or the AUX input is selected as the input to the ADC, not when the ADC input is configured
in fully-differential mode. This feature is available even if the ADC and DAC are powered down. The analog
volume control has a range from +12 dB to –34.5 dB in 0.5 dB steps plus mute and includes softstepping logic.
The internal oscillator is used for softstepping whenever the ADC and DAC are powered down.
Keyclick
A special circuit has been included for inserting a squarewave signal into the analog output signal path based
on register control. This functionality is intended for generating keyclick sounds for user feedback. Register
04H/Page 2 contains bits that control the amplitude, frequency, and duration of the squarewave signal. The
frequency of the signal can be varied from 62.5 Hz to 8 kHz and its duration can be programmed from 2 periods
to 32 periods. Whenever this register is written, the square wave is generated and coupled into the audio output.
The keyclick enable bit D15 of control register 04H/Page 2 is reset after the duration of a keyclick is played out.
This capability is available even when the ADC and DAC are powered down.
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 TSC2101 supports the resistive 4-wire configurations (see Figure 25). 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 25. It consists of two transparent resistive layers
separated by insulating spacers.
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
Figure 25. 4-Wire Touch Screen Construction
The 4-wire touch screen panel works by applying a voltage across the vertical or horizontal resistive network.
The ADC converts the voltage measured at the point the panel is touched. A measurement of the Y position
of the pointing device is made by connecting the X+ input to an ADC, turning on the Y drivers, 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 ADC.
Voltage is then applied to the other axis, and the ADC converts the voltage representing the X position on the
screen. This provides the X and Y coordinates to the associated processor.
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