XPT2046 Ver la hoja de datos (PDF) - Unspecified

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Fabricante

XPT2046

Touch Screen Controller

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XPT2046 Touch Screen Controller

Figure 10. Battery Measurement Functional Block Diagram

Pressure Measurement

Measuring touch pressure can also be done with the XPT2046. To determine pen or finger touch, the pressure

of the touch needs to be determined. Generally, it is not necessary to have very high performance for this test;

therefore, the 8-bit resolution mode is recommended(however, calculations will be shown here in the 12-bit

resolution mode). There are several different ways of performing this measurement. The XPT2046 supports two

methods. The first method requires knowing the X-plate resistance, measurement of the X-Position, and two

additional cross panel measurements (Z1 and Z2) of the touch screen, as shown in Figure 11. Using Equation (3)

calculates the touch resistance:

R

触摸＝RX 面板·

XPosition

4096

⎛

⎜⎝

Z2

Z1

− 1⎞⎠⎟

………………（3）

The second method requires knowing both the X-plate and Y-plate resistance, measurement of X-Position and

Y-Position, and Z1. Using Equation (4) also calculates the touch resistance:

Rtouch R 1− ＝

RX-Plate•X-Position

4096

⎛

⎜

⎝

4096

⎞

−1⎟

－

Z1 ⎠

⎛

⎜

Y

−

Plate

⎜

⎜⎜⎝

⎞

Y -Position ⎟

⎟

4096 ⎟⎟⎠ … … （ 4）

Copyright©2007, SHENZHEN XPTEK TECHNOLOGY CO.,LTD http://www.xptek.com.cn

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