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XPT7603 Scheda tecnica(PDF) 17 Page - List of Unclassifed Manufacturers

Il numero della parte XPT7603
Spiegazioni elettronici  4-wire resistive touch screen controller
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Produttore elettronici  ETC2 [List of Unclassifed Manufacturers]
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XPT7603 Scheda tecnica(HTML) 17 Page - List of Unclassifed Manufacturers

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Figure 1 the battery voltage measurement function module map
8.9
Pressure Measurement
XPT7603 can also measure the pressure of touch, that is written in Table 3 Measurement of Z direction. In
general, the performance of such measurements do not ask for much, so the use of 8-bit resolution mode
(however, the calculation is the following 12-bit resolution mode) can be. There are several different ways to
achieve the pressure measurements. The first method needs to know X panel of the resistance, X the location
of the measurement, touch screen panel attached between the two measured values (Z1 and Z2), as shown
in Figure 11. Formula can be used (3) calculate the touch resistance:
R touch = RX panel • ... ... ... ... ... ... (3)
The second approach requires the detection of X and Y panels panel resistance, X and Y position, and
the Z1 position. Formula can be (4) Calculation of touch resistance: ... ... ... ... ... ... (4)
Figure 1 Pressure Measurement Block Diagram
9
Digital Interface
XPT7603 data interface is I2C serial interface, I2C interface to meet the agreement, can realize
the standard model (100K), fast mode (400K) or high-speed mode (3.4M), divided into the control
of XPT7603 writing, reading two command format, write command is used to enter an address and
command bytes, so that work in the designated XPT7603 configuration and mode, XPT7603 read
command is used to output data of ADC conversion in order to obtain information related to
measurement.


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