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TSC2046 数据表(PDF) 9 Page - Burr-Brown (TI)

[Old version datasheet] Texas Instruments acquired Burr-Brown Corporation. Click here to check the latest version.
部件名 TSC2046
功能描述  Low Voltage I/O TOUCH SCREEN CONTROLLER
Download  23 Pages
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制造商  BURR-BROWN [Burr-Brown (TI)]
网页  http://www.burr-brown.com
标志 BURR-BROWN - Burr-Brown (TI)

TSC2046 数据表(HTML) 9 Page - Burr-Brown (TI)

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TSC2046
9
SBAS265C
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
VBAT
AUXIN
TEMP
Y–
X+
Y+
Y-POSITION
X-POSITION
Z1-POSITION Z2-POSITION
X-DRIVERS
Y-DRIVERS
00
0
+IN (TEMP0)
Off
Off
0
0
1
+IN
Measure
Off
On
0
1
0
+IN
Off
Off
0
1
1
+IN
Measure
X–, On
Y+, On
1
0
0
+IN
Measure
X–, On
Y+, On
1
0
1
+IN
Measure
On
Off
1
1
0
+IN
Off
Off
11
1
+IN (TEMP1)
Off
Off
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
Z1-POSITION
Z2-POSITION
DRIVERS ON
0
0
1
Y+
Y–
+IN
Measure
Y+, Y–
0
1
1
Y+
X–
+IN
Measure
Y+, X–
1
0
0
Y+
X–
+IN
Measure
Y+, X–
1
0
1
X+
X–
+IN
Measure
X+, X–
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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