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XPT7603 Datasheet(PDF) 14 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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Figure 1 Schematic diagram of single-ended mode (C3 = 0, Y direction drive switch closure, XP as an analog
input)
8.5
Differential Mode
When the command control bit C3 is high, XPT7603 is in the measurement mode of X, Y, Z, the
internal ADC reference voltage source is the differential mode, shown in Figure 8.
The advantage of differential mode: + REF and-REF input directly to the YP, YN, Which can
eliminate measurement error because of the switch on-resistance. The disadvantage is that: both
the sample or conversion process, the driver will need to be on, relative to single-ended mode, the
power consumption increased.
Figure 1 Differential reference mode diagram (C3 = 1, Y direction drive switch closure, XP as an analog input)
8.6
Application Recommendations of Touch Screen
In the application, it is recommended to add some external capacitor across the touch screen in




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