參數(shù)資料
型號: LTC1199
廠商: Linear Technology Corporation
英文描述: 10-Bit, 500ksps ADCs with Auto Shutdown(5V,10位, 500ksps 模數(shù)轉(zhuǎn)換器(帶自動關(guān)斷))
中文描述: 10位,500ksps的自動關(guān)機(jī)(5V的,10位,500ksps模數(shù)轉(zhuǎn)換器(帶自動關(guān)斷)模數(shù)轉(zhuǎn)換器)
文件頁數(shù): 25/28頁
文件大小: 304K
代理商: LTC1199
25
LTC1197/LTC1197L
LTC1199/LTC1199L
U
S
A
O
PPLICATI
TYPICAL
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
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
μ
F
C1
1
μ
F
1197/99 F13
C3
10
μ
F
1
2
3
4
8
7
6
5
V
CC
CLK
D
OUT
D
IN
CS
CH0
CH1
GND
+
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
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.
相關(guān)PDF資料
PDF描述
LTC1199L 10-Bit, 500ksps ADCs with Auto Shutdown(2.7V,10位, 500ksps 模數(shù)轉(zhuǎn)換器(帶自動關(guān)斷))
LTC1235 Microprocessor Supervisory Circuit
LTC1235C Microprocessor Supervisory Circuit
LTC1235CN Microprocessor Supervisory Circuit
LTC1235CS Microprocessor Supervisory Circuit
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