参数资料
型号: LTC1199LIS8#PBF
厂商: Linear Technology
文件页数: 18/28页
文件大小: 0K
描述: IC ADC 10BIT 210KHZ W/SD 8-SOIC
标准包装: 100
位数: 10
采样率(每秒): 210k
数据接口: MICROWIRE?,串行,SPI?
转换器数目: 1
功率耗散(最大): 25mW
电压电源: 单电源
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 8-SOIC(0.154",3.90mm 宽)
供应商设备封装: 8-SOIC
包装: 管件
输入数目和类型: 1 个单端,单极
25
LTC1197/LTC1197L
LTC1199/LTC1199L
Figure 13. The LTC1199 Digitizes Resistive Touchscreen X and Y Axis Voltages. The ADC’s Auto Shutdown Feature
Helps Maximize Battery Life in Portable Touchscreen Equipment
Resistive Touchscreen Interface
Figure 13 shows the LTC1199 in a 4-wire resistive touch-
screen application. Transistor pairs Q1-Q3, Q2-Q4 apply
5V and ground to the X axis and Y axis, respectively. The
LTC1199, with its 2-channel multiplexer, digitizes the
voltage generated by each axis and transmits the conver-
sion results to the system’s processor through a serial
interface. RC combinations R1C1, R2C2 and R3C3 form
lowpass filters that attenuate noise from possible sources
such as the processor clock, switching power supplies
and bus signals. The 74HC14 inverter is used to detect
screen contact both during a conversion sequence and to
trigger its start. Using the single channel LTC1197, 5-wire
resistive touchscreens are as easily accommodated.
TYPICAL APPLICATIO S
U
C4
1000pF
C6
1000pF
C5
1000pF
R8
4.7k
R11
100k
R12
100k
R6
4.7k
R3
10
R7
100k
R1
100
LTC1199
R2
100
R7
100k
R9
100k
Q1
2N2907
Q3
2N2222A
Q2
2N2907
R10
4.7k
74HC14
R6
4.7k
5V
Y+
X
Y
X+
TOUCH SENSE
CHIP SELECT
SERIAL CLK
DATA IN
DATA OUT
Q4
2N2222A
C7
1000pF
C2
1
F
C1
1
F
1197/99 F13
C3
10
F
1
2
3
4
8
7
6
5
VCC
CLK
DOUT
DIN
CS
CH0
CH1
GND
+
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