參數(shù)資料
型號: AK4650VG
廠商: Asahi Kasei Microsystems Co.,Ltd
元件分類: Codec
英文描述: 16Bit ツヒ CODEC with MIC/HP/SPK-AMP & TSC
中文描述: 16位ツヒ編解碼器麥克風(fēng)/惠普/胰腎聯(lián)合移植腺苷
文件頁數(shù): 46/86頁
文件大?。?/td> 824K
代理商: AK4650VG
[AK4650]
MS0502-E-01
2007/04
- 46 -
Pen Position Detection of Touch Screen
The selected touch screen position is detected by the voltage measurement of one axis when the voltage is supplied
between the two terminals of the other axis. At least two A/D conversions are needed to get the two-dimensional (X/Y
axis) position.
YN
XN
YP
ON
VREF+
VREF-
ADC
AIN+
AIN-
XP
ON
a) X-Position Measurement
Differential Mode
b) Y-Position Measurement
Differential Mode
YN
XN
YP
ON
VREF+
VREF-
ADC
AIN+
AIN-
XP
ON
Figure 34. Axis Measurement
The differential mode is generally more accurate than the single-ended mode for the position detection. Since the full
scale of single-ended mode is fixed to the internal (or external) reference voltage, the input voltage may exceed the
full-scale reference voltage. This problem does not occur in differential mode. In addition to this, the differential mode is
less influenced by power supply voltage variation by the ratio-metric measurement.
However, note that the touch screen driver switch is still ON and the current flows even for the A/D conversion time.
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