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XPT7603 Datasheet(Folha de dados) 16 Page - List of Unclassifed Manufacturers

Nome de Peças. XPT7603
descrição  4-wire resistive touch screen controller
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Fbricantes  ETC2 [List of Unclassifed Manufacturers]
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Second and the first conversion of the voltage difference by the equation (1), said:
V = ... ... ... ... ... ... ... ... ... ... (1)
Of which:
N - Current ratio coefficient, equal to 91;
k -伯尔兹曼 constant, equal to 1.38054 × 10-23 volts per opening (V • K-1);
q - charge, equal to 1.602189 • 10-19C
T - temperature (Kelvin)
Second, more than one way to provide a more accurate method of measuring accuracy can be
achieved 2 ℃
Absolute temperature conversion formula is:
... ... ... ... ... ... ... ... ... ... (2)
Of which:
V = V (I91)
- V (I1) (in mV)
° K = 2.573
K / mV •
V
 △
= 2.573 •
V (mV)
℃△
- 273
K
 
Note: Since each diode bias current is only the work of the three sampling clock cycle (only
during the sampling), so the increase in power consumption is obvious, especially in temperature
measurement is only occasional at this time of internal XPT7603 on behalf of the junction
temperature can be ambient temperature.
8.8
Battery Measurement
Shown in figure 10, the battery voltage from 0V to 6V ,input voltage (VBAT) through sub-pressure
(1 / 4) enter to the ADC, so the battery voltage of 5.5V was divided into 1.375V then enter the
ADC.




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