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参数资料
| 型号： | MAX1233 |
| 厂商： | Maxim Integrated Products, Inc. |
| 英文描述： | 【15kV ESD-Protected Touch-Screen Controllers Include DAC and Keypad Controller |
| 中文描述： | ±15kV ESD保护触摸屏控制器，包含DAC及键盘控制器 |
| 文件页数： | 12/44页 |
| 文件大小： | 706K |
| 代理商： | MAX1233 |
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M
±15kV ESD-Protected Touch-Screen
Controllers Include DAC and Keypad Controller
12
______________________________________________________________________________________
Detailed Description
The MAX1233/MAX1234 are 4-wire touch-screen con-
trollers.
Figure 1
shows the functional diagram of the
MAX1233/MAX1234. Each device includes a 12-bit sam-
pling ADC, 8-bit voltage output DAC, keypad scanner
that can also be configured as a GPIO, internal clock,
reference, temperature sensor, two battery monitor
inputs, two auxiliary analog inputs, SPI/QSPI/
MICROWIRE-compatible serial interface, and low on-
resistance switches for driving touch screens.
The 16-bit register inside the MAX1233/MAX1234
allows for easy control and stores results that can be
read at any time. The
BUSY
output indicates that a
functional operation is in progress. The
PENIRQ
and
KEYIRQ
outputs, respectively, indicate that a screen
touch or a key press has occurred.
Touch-Screen Operation
The 4-wire touch-screen controller works by creating a
voltage gradient across the vertical or horizontal resis-
tive touch screen connected to the analog inputs of the
MAX1233/MAX1234, as shown in
Figure 2
. The voltage
across the touch-screen panels is applied through inter-
nal MOSFET switches that connect each resistive layer
to AV
DD
and ground. For example, to measure the Y
position when a pointing device presses on the touch
screen, the Y+ and Y- drivers are turned on, connecting
one side of the vertical resistive layer to AV
DD
and the
other side to ground. The horizontal resistive layer func-
tions as a sense line. One side of this resistive layer gets
connected to the X+ input, while the other side is left
open or floating. The point where the touch screen is
pressed brings the two resistive layers in contact and
creates a voltage-divider at that point. The data convert-
er senses the voltage at the point of contact through the
X+ input and digitizes it.
12-Bit ADC
Analog Inputs
Figure 3
shows a block diagram of the ADC
’
s analog
input section including the input multiplexer, the differen-
tial input, and the differential reference. The input multi-
plexer switches between X+, X-, Y+, Y-, AUX1, AUX2,
BAT1, BAT2, and the internal temperature sensor.
The time required for the T/H to acquire an input signal
is a function of how quickly its input capacitance is
charged. If the input signal
’
s source impedance is high,
the acquisition time lengthens, and more time must be
allowed. The acquisition time (t
ACQ
) is the maximum
time the device takes to acquire the input signal to 12-
bit accuracy. Configure t
ACQ
by writing to the ADC
control register. See
Table 1
for the maximum input sig-
nal source impedance (R
SOURCE
) for complete settling
during acquisition.
Accommodate higher source impedances by placing a
0.1μF capacitor between the analog input and GND.
Input Bandwidth
The ADC
’
s input-tracking circuitry has a 0.5MHz small-
signal bandwidth. To avoid high-frequency signals
being aliased into the frequency band of interest, anti-
alias filtering is recommended.
PIN
19
20
21
22
23
24
NAME
C2
C3
C4
KEYIRQ
PENIRQ
DOUT
FUNCTION
Keypad Column 2. Can be reconfigured as GPIO5.
Keypad Column 3. Can be reconfigured as GPIO6.
Keypad Column 4. Can be reconfigured as GPIO7.
Active-Low Keypad Interrupt.
KEYIRQ
is low when a key press is detected.
Active-Low Pen Touch Interrupt.
PENIRQ
is low when a screen touch is detected.
Serial Data Output. Data is clocked out at SCLK falling edge. High impedance when
CS
is high.
25
BUSY
Active-Low Busy Output.
BUSY
goes low and stays low during each functional operation. The host
controller should wait until
BUSY
is high again before using the serial interface.
26
DIN
Serial Data Input. Data is clocked in on the rising edge of SCLK.
27
SCLK
Serial Clock Input. Clocks data in and out of the serial interface and sets the conversion speed (duty
cycle must be 30% to 70%).
28
CS
Active-Low Chip Select. Data is not clocked into DIN unless
CS
is low. When
CS
is high, DOUT is
high impedance.
*
ESD protected: ±8kV Contact, ±15kV Air.
Pin Description (continued)
相关PDF资料 |
PDF描述 |
|---|---|
| MAX1233EGI | 【15kV ESD-Protected Touch-Screen Controllers Include DAC and Keypad Controller |
| MAX1234EGI | 【15kV ESD-Protected Touch-Screen Controllers Include DAC and Keypad Controller |
| MAX1239 | 2.7V to 3.6V and 4.5V to 5.5V, Low-Power, 4-/12-Channel, 2-Wire Serial, 12-Bit ADCs |
| MAX1239LEEE | 2.7V to 3.6V and 4.5V to 5.5V, Low-Power, 4-/12-Channel, 2-Wire Serial, 12-Bit ADCs |
| MAX1239MEEE | Circular Connector; No. of Contacts:128; Series:D38999; Body Material:Metal; Connecting Termination:Crimp; Connector Shell Size:25; Circular Contact Gender:Pin; Circular Shell Style:Wall Mount Receptacle; Insert Arrangement:25-35 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1233EGI | 功能描述:触摸屏转换器和控制器 RoHS:否 制造商:Microchip Technology 类型:Resistive Touch Controllers 输入类型:3 Key 数据速率:140 SPS 分辨率:10 bit 接口类型:4-Wire, 5-Wire, 8-Wire, I2C, SPI 电源电压:2.5 V to 5.25 V 电源电流:17 mA 工作温度:- 40 C to + 85 C 封装 / 箱体:SSOP-20 |
| MAX1233EGI+ | 制造商:Maxim Integrated Products 功能描述: |
| MAX1233EGI-T | 功能描述:触摸屏转换器和控制器 RoHS:否 制造商:Microchip Technology 类型:Resistive Touch Controllers 输入类型:3 Key 数据速率:140 SPS 分辨率:10 bit 接口类型:4-Wire, 5-Wire, 8-Wire, I2C, SPI 电源电压:2.5 V to 5.25 V 电源电流:17 mA 工作温度:- 40 C to + 85 C 封装 / 箱体:SSOP-20 |
| MAX1233ETI+ | 功能描述:触摸屏转换器和控制器 4Ch uWire QSPI/SPI Touch Interface RoHS:否 制造商:Microchip Technology 类型:Resistive Touch Controllers 输入类型:3 Key 数据速率:140 SPS 分辨率:10 bit 接口类型:4-Wire, 5-Wire, 8-Wire, I2C, SPI 电源电压:2.5 V to 5.25 V 电源电流:17 mA 工作温度:- 40 C to + 85 C 封装 / 箱体:SSOP-20 |
| MAX1233ETI+T | 功能描述:触摸屏转换器和控制器 4Ch uWire QSPI/SPI Touch Interface RoHS:否 制造商:Microchip Technology 类型:Resistive Touch Controllers 输入类型:3 Key 数据速率:140 SPS 分辨率:10 bit 接口类型:4-Wire, 5-Wire, 8-Wire, I2C, SPI 电源电压:2.5 V to 5.25 V 电源电流:17 mA 工作温度:- 40 C to + 85 C 封装 / 箱体:SSOP-20 |
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