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參數資料
| 型號： | UCB1200 |
| 廠商： | NXP Semiconductors N.V. |
| 英文描述： | Advanced modem/audio analog front-end |
| 中文描述： | 先進的調制解調器/音頻模擬前端 |
| 文件頁數： | 16/54頁 |
| 文件大小： | 1052K |
| 代理商： | UCB1200 |
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1998 Jul 22
16
Philips Semiconductors
Product specification
Advanced modem/audio analog front-end
UCB1200
TOUCH SCREEN INTERFACE
The UCB1200 contains a universal resistive touch screen interface for 4-wire resistive touch screen, capable of
performing position, pressure and plate resistance measurements. In addition the touch screen can be programmed to
generate interrupts when the touch screen is pressed. The last mode is also active when the UCB1200 is set in the
stand-by mode.
The touch screen interface connects to the touch screen by four wires: TSPX, TSMX, TSPY and TSMY. Each of these
pins can be programmed to be floating, powered or grounded in the touch screen switch matrix. The setting of each touch
screen pin is programmable through the touch screen control register. Possible conflicting settings (grounding and
powering of a touch screen pin at the same time) are detected by the UCB1200. In that case the touch screen pin will be
grounded.
The UCB1200’s internal voltage reference (V
ref
) is used as reference voltage for the touch screen bias circuit. This makes
the touch screen biasing independent of supply voltage and temperature variations. Four low pass filters, one on each
touch screen terminal, are built in to minimize the noise coupled from the LCD into the touch screen signals. An LCD
typically generates large noise glitches on the touch screen, since they are closely coupled. The influence of the glitches
can nevertheless be minimized by performing measurements when the LCD is quiet. This can be done by synchronizing
the measurement and the video driver with the ADCSYNC pin.
Fig.11 Block diagram of the touch screen interface.
t
t
t
t
ts..power
ts..ground
vssa3
adc_input[2:0]
tsc_mode
vdda1
touch screen
bias voltage
touch screen
current monitor
tsc_mode_sel
to adc input
vssa1
tsc_bias_ena
analog mux
相關PDF資料 |
PDF描述 |
|---|---|
| UCB1200BE | Advanced modem/audio analog front-end |
| UCB1300 | Advanced modem/audio analog front-end |
| UCB1300BE | Advanced modem/audio analog front-end |
| UCB1400BE | Audio codec with touch screen controller and power management monitor |
| UCB1400 | Audio codec with touch screen controller and power management monitor |
相關代理商/技術參數 |
參數描述 |
|---|---|
| UCB1200B | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:UCB1200B |
| UCB1200BE | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Advanced modem/audio analog front-end |
| UCB1300 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Advanced modem/audio analog front-end |
| UCB1300BE | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Advanced modem/audio analog front-end |
| 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 |
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