參數(shù)資料
型號: TSC2046IPWR
英文描述: CONTINUOUS TIME UNIPOLAR SWITCH
中文描述: 低電壓I / O觸摸屏控制器
文件頁數(shù): 9/23頁
文件大?。?/td> 554K
代理商: TSC2046IPWR
TSC2046
SBAS265C
9
www.ti.com
ANALOG INPUT
Figure 2 shows a block diagram of the input multiplexer on
the TSC2046, the differential input of the ADC, and the
differential reference of the converter. Table I and Table II
show the relationship between the A2, A1, A0, and
SER/DFR
control bits and the configuration of the TSC2046. The
control bits are provided serially via the DIN pin—see the
Digital Interface section of this data sheet for more details.
A2
A1
A0
V
BAT
AUX
IN
TEMP
Y–
X+
Y+
Y-POSITION
X-POSITION
Z
1
-POSITION
Z
2
-POSITION
X-DRIVERS
Y-DRIVERS
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
+IN (TEMP0)
Off
Off
Off
Off
On
Off
+IN
Measure
+IN
+IN
Measure
X–, On
X–, On
On
Off
Off
Y+, On
Y+, On
Off
Off
Off
+IN
Measure
+IN
Measure
+IN
+IN (TEMP1)
TABLE I. Input Configuration (DIN), Single-Ended Reference Mode (
SER/DFR
high).
TABLE II. Input Configuration (DIN), Differential Reference Mode (
SER/DFR
low).
A2
A1
A0
+REF
–REF
Y–
X+
Y+
Y-POSITION
X-POSITION
Z
1
-POSITION
Z
2
-POSITION
DRIVERS ON
0
0
1
1
0
1
0
0
1
1
0
1
Y+
Y+
Y+
X+
Y–
X–
X–
X–
+IN
+IN
Measure
Y+, Y–
Y+, X–
Y+, X–
X+, X–
Measure
+IN
Measure
+IN
Measure
When the converter enters the hold mode, the voltage
difference between the +IN and –IN inputs (as shown in
Figure 2) is captured on the internal capacitor array. The
input current into the analog inputs depends on the conver-
sion rate of the device. During the sample period, the source
must charge the internal sampling capacitor (typically 25pF).
After the capacitor has been fully charged, there is no further
input current. The rate of charge transfer from the analog
source to the converter is a function of conversion rate.
FIGURE 2. Simplified Diagram of Analog Input.
ADC
Logic
Level
Shifter
REF
+REF
+IN
IN
V
BAT
AUX
Battery
On
GND
2.5V
Reference
Ref On/Off
X+
X–
+V
CC
TEMP1
PENIRQ
50k
or
90k
Y+
Y–
V
REF
IOVDD
TEMP0
7.5k
2.5k
A2-A0
(Shown 001
B
)
SER/DFR
(Shown Low)
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