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XPT7603 Datasheet(PDF) 13 Page - List of Unclassifed Manufacturers

Part No. XPT7603
Description  4-wire resistive touch screen controller
Download  25 Pages
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Maker  ETC2 [List of Unclassifed Manufacturers]
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 13 page
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0
0
1
0
+IN
Off
Off
0
0
1
1
0
1
0
0
+IN
(TEMP1)
Off
Off
0
1
0
1
+IN
Off
Off
0
1
1
0
+IN
Off
Off
0
1
1
1
1
0
0
0
Long driver, Accelerate mode
+IN
meas
On
Off
1
0
0
1
Long driver, Accelerate mode
+IN
meas
Off
On
1
0
1
0
Long driver, Accelerate mode
+IN
meas
XN
On
YP
On
1
0
1
1
Long driver, Accelerate mode
+IN
meas
XN
On
YP
On
1
1
0
0
Short driver, auto power down,low power
mode
+IN
meas
On
Off
1
1
0
1
Short driver, auto power down,low power
mode
+IN
meas
Off
On
1
1
1
0
Short driver, auto power down,low power
mode
+IN
meas
XN
On
YP
On
1
1
1
1
Short driver, auto power down,low power
mode
+IN
meas
XN
On
YP
On
8.3
Internal Vref
XPT7603 internal 2.5V reference voltage source can be off or on through the control-bit PD1 (see
Table 6 and Figure 6).In general, the internal reference voltage is only used to measure VBAT,
Temp and AUX input. If the request for higher measurement accuracy, you should use an external
reference voltage source. An external reference input directly from the VREF pin,which is in
use,be sure to close the internal reference voltage source.
Figure 6 Internal Vref Schematic
8.4
Single-ended Mode
When the command control bit C3 is low, XPT7603 is in the measurement mode of BAT, AUX or
Temp, the internal ADC reference voltage source is the single-ended mode, using the internal
2.5V reference source (can also use the external input voltage source) as the ADC reference
voltage, application of the principle of single-ended mode shown in Figure 7.




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