參數(shù)資料
型號(hào)： AK4184VG
廠商： Asahi Kasei Microsystems Co.,Ltd
英文描述： TSC with Keypad Scanner and GPIO Expander
中文描述： 臺(tái)糖與鍵盤掃描儀和GPIO擴(kuò)展
文件頁(yè)數(shù)： 11/36頁(yè)
文件大?。?/td> 597K
代理商： AK4184VG
[AK4184]
MS0603-E-00
2007/04
11
■
Pen Pressure Measurement
Touch screen pen pressure can be derived from the measurement of the contact resistor between two plates. The
contact resistance depends on the size of the depressed area and the pressure. The area of the spot is proportional to
the contact resistance. This resistance (Rtouch) can be calculated using two different methods.
The first method is when the total resistance of the X-plate sheet is already known. The resistance, Rtouch, is
calculated from the results of three A/D conversions: X-position, Z1-Position, and Z2-Position, using the following
formula:
Rtouch = (Rxplate) * (Xposition/4096) * [(Z2/Z1) – 1]
The second method is when both the resistances of the X-plate and Y-plate are known. The resistance, Rtouch, is
calculated from the results of three A/D conversions: X-position, Y-Position, and Z1-Position, using the following
formula:
Rtouch = (Rxplate*Xposition/4096)*[(4096/Z1) – 1] – Ryplate*[1 – (Yposition/4096)]
AVDD
XN-Driver SW ON
YN
VREF+
VREF-
ADC
AIN+
AIN-
XP
YP
XN
YP-Driver SW ON
a) Z1-Position Measurement
Rtouch
XN-Driver SW ON
YN
VREF+
VREF-
ADC
AIN+
AIN-
XP
YP
XN
YP-Driver SW ON
b) Z2-Position Measurement
Rtouch
AVDD
Figure 4. Pen Pressure Measurements
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