參數(shù)資料
型號(hào): LTC1197LIS8#TRPBF
廠商: Linear Technology
文件頁數(shù): 18/28頁
文件大?。?/td> 0K
描述: IC ADC 10BIT 250KHZ W/SD 8-SOIC
標(biāo)準(zhǔn)包裝: 2,500
位數(shù): 10
采樣率(每秒): 250k
數(shù)據(jù)接口: MICROWIRE?,串行,SPI?
轉(zhuǎn)換器數(shù)目: 1
功率耗散(最大): 25mW
電壓電源: 單電源
工作溫度: -40°C ~ 85°C
安裝類型: 表面貼裝
封裝/外殼: 8-SOIC(0.154",3.90mm 寬)
供應(yīng)商設(shè)備封裝: 8-SOIC
包裝: 帶卷 (TR)
輸入數(shù)目和類型: 1 個(gè)差分,單極
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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