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XPT7603 Datasheet(PDF) 15 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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order to filter the noise from touch-screen (such as: the noise from backlight and LCD circuit).
Capacitors and resistors form a low-pass filter to suppress noise. Too large capacitance value
may lead to an increase in set-up time, there gain error. So capacitance should be taken into
consideration to choose the input signal bandwidth requirements.
8.7
Temperature Measurement
Integrated temperature detection for the detection of temperature. There are two methods of
temperature measurement.
Method I: direct measurement
The use of the PN junction diode temperature coefficient characteristics of a relatively stable
through measuring the PN junction diode voltage to measure the temperature, can be pre-tested
and stored the PN junction voltage (600mV typical value of about) at room temperature, PN
junction temperature coefficient is about -- 2mV /
,
℃ measure the PN junction voltage at other
temperature ,then the temperature can be got. This method would change with the process, and
the need for correction
Figure 1 Schematic diagram of temperature measurement function
Method 2: indirect measurement
This method does not require the test temperature specified benchmarks, the accuracy can
achieve 2
. This me
thod requires a second conversion:
The first time, set up "A2A1A0" = "000", test temp0 the PN junction current-voltage V0
Second, set up "A2A1A0" = "111", to achieve 91 times the current temp0 big test at this time of
the PN junction voltage V1.




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