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參數資料
| 型號： | UCB1100 |
| 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： | 17/36頁 |
| 文件大小： | 290K |
| 代理商： | UCB1100 |
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Philips Semiconductors
Preliminary specification
UCB1100
Advanced modem/audio analog front-end
1998 May 08
17
6.4
The UCB1100 contains a universal resistive touch screen interface
for 4 wire resistive touch screen, capable of performing both
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
UCB1100 is set in the standby mode.
Touch Screen Interface
ts.. power
ts.. ground
analog mux
adc_input_sel
vssa3
vssa1
vdda1
tsc_mod_sel
tsc_mod_sel
to adc input
touch screen
bias voltage
touch screen
mux
tspx
tspy
tsmx
tsmy
tsc_bias_ena
SN00142
Figure 17.
Block Diagram of the Touch Screen Interface
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 tbe floating, powered or grounded in the touch
screen switch matrix. The setting of each touch screen pin is
programmable by the power ts..and ground ts..bits in the touch
screen control register. Possible conflicting settings (grounding and
powering of a touch screen pin at the same time) are detected by
the UCB1100. In that case the UCB1100 will ground the touch
screen pin.
The UCB1100’s internal voltage reference (Vref) is as reference
voltage for the touch screen bias circuitry. 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.
tsmx
tsmy
tspx
tspy
Vdda
Rint
comparator
comparator
SN00143
Figure 18.
Touch Screen Setup for Interrupt Detection
In addition to the measurements made above, the touch screen can
also act as an interrupt source. In this mode the X plate of the touch
screen has to be powered and the Y plate has to be grounded. In
this case the touch screen is not biased by the active touch screen
bias circuit, but by a resistor to vdda1. This configuration simply
biases the touch screen and the UCB1100 does not consume power
unless the touch screen is touched. The voltage on the X plate
terminals drops if the screen is pressed. This voltage drop is
detected by Schmitt trigger circuits, of which the outputs are
connected to the interrupt control block. An touch screen interrupt is
generated either when the touch screen is pressed (falling edge
enabled) or when the touch screen is released (rising edge
enabled). which can by used to activate the system around the
UCB1100 to start a touch screen readout sequence. The internal
Schmitt trigger circuits are connected to the tspx and tsmx signals
after the built in low pass filters. This reduces the number of
spurious interrupts, due to the coupling between the LCD screen
and the touch screen sensors.
Each of the four touch screen signals can be selected as input for
the built in 10 bit ADC, which is used to determine the voltage on the
selected touch screen pin. The flexible switch matrix and the multi
functional touch screen bias circuit enables the user of the UCB1100
to set each desired touch screen configuration.
The setting of the touch screen bias circuitry and the adc_input
multiplexer is determined by the setting of the tsc_mod_selbits in
the touch screen control register according the following table.
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| UCB1100LP | Advanced modem/audio analog front-end |
| UCB1200 | Advanced modem/audio analog front-end |
| UCB1200BE | Advanced modem/audio analog front-end |
| UCB1300 | Advanced modem/audio analog front-end |
| UCB1300BE | Advanced modem/audio analog front-end |
相關代理商/技術參數 |
參數描述 |
|---|---|
| UCB1100LP | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Advanced modem/audio analog front-end |
| UCB1100LP/X3 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Advanced modem/audio analog front-end |
| UCB-12 | 功能描述:斷路器 CIRCUIT BREAKER RoHS:否 制造商:Phoenix Contact 產品:Device Circuit Breakers 產品類型:Thermomagnetic 電流額定值:2 A 電壓額定值 AC:240 V, 277 V 電壓額定值 DC:50 V 極數:1 Pole 執(zhí)行器類型:Slide 電路功能:Trip Free 系列:CB TM1 工作溫度范圍:- 30 C to + 60 C 照明:No |
| UCB1200 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Advanced modem/audio analog front-end |
| UCB1200B | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:UCB1200B |
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