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XPT7603 Datasheet(PDF) 12 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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 12 page
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8
Theory of Operation
8.1
The Basic Principle
XPT7603 is a typical type of successive approximation ADC (SAR ADC), contains a sample / hold, analog-to-
digital conversion, serial data output functions. At the same time, there is a 2.5V internal reference voltage
source, the temperature detection circuit, and using external clock. Single power supply, power supply
voltage range of 1.8V ~ 5.5V. Vref directly determines the range of ADC input , the reference voltage can use
the internal reference voltage, can also be directly imported from outside the range of 1V ~ VCC reference
voltage (the requirements of external reference voltage source with low output impedance). The analog inputs
(X, Y, Z, VBAT, Temp, and AUX) via control register enter the ADC, ADC can be configured as single-ended
or differential mode. Selecting VBAT, Temp and AUX ,ADC should be configured for single-ended mode; as a
touch screen application, it should be configured as a differential mode, which can effectively eliminate the
parasitic resistance of the driver switch and external interference caused by measurement error and improve
the conversion accuracy.
8.2
Analog Input Characteristics
Figure 5 describes MUX, ADC's analog input, reference voltage reference as well as the I2C interface circuit.
Table 3 shows the control byte order bit C3, C2, C1, C0 and the relationship of configuration between
XPT7603.
Figure 5 XPT7603 Analog Input Schematic
Table 3 ADC Input Configuration
C3
C2
C1
C0
BAT2
BAT1
AUX2
AUX1
TEMP
YN
XP
YP
Y-
Position
X-
Position
Z1-
Position
Z2-
Position
X-
Drive
r
Y-
Drive
r
0
0
0
0
+IN
(TEMP0
)
Off
Off
0
0
0
1
+IN
Off
Off




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