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)： 10/36頁(yè)
文件大?。?/td> 597K
代理商： AK4184VG
[AK4184]
MS0603-E-00
2007/04
10
■
Touch Screen Position Detection
XY-coordinate detection (XY-position) from the touch panel is determined by the control command (A1, A0) bits of
the touch screen control command. Coordinate detection is in differential mode. The full scale (
Δ
VREF) is the
differential voltage between the non-inverting terminal and the inverting terminal of the measured axis (e.g. X-axis
measurement:
Δ
VREF = V
XP
– V
XN
). The input (
Δ
AIN) of the A/D converter is the voltage between the non-inverting
terminal (V
XP
) of the non-target axis and the inverting terminal (V
XN
) of the target axis. (E.g.
Δ
AIN = (AIN+)-(AIN-)
= V
YP
– V
XN
) The input voltage charges the internal capacitor during the sampling time period. No current flows into
the internal capacitors after the capacitor has been fully charged. The required settling time to charge the internal
capacitor array depends on the source impedance (Rin). The source impedance is the resistance of the touch panel
plate. If the source impedance is 600
Ω
, the settling time needs to be at least 1.5
μ
s. The maximum throughput of the
A/D converter is 125kHz. If the source impedance of the analog input is larger than 600
Ω
, longer settling time is
required. The position from the touch screen is detected by taking the voltage of one axis when the voltage is supplied
between the two terminals of another axis. At least two A/D conversions are needed to get the two-dimensional (X/Y
axis) position.
The X-Plate and Y-plate are connected on the dotted line when the panel is touched.
XP
XN
X-Plate (Top side)
Y-Plate (Bottom side)
c) 4-wire Touch Screen
X-Plate
Y-Plate
X-Plate
YP
YN
YN
XN
YP
XN-Driver SW ON
VREF+
VREF-
ADC
AIN+
AIN-
XP
XP-Driver SW ON
a) X-Position Measurement Differential Mode
b) Y-Position Measurement Differential Mode
YN
XN
YP
YN-Driver SW ON
VREF+
VREF-
ADC
AIN+
AIN-
XP
YP-Driver SW ON
AVDD
AVDD
Touch Screen
Y-Plate
Figure 3. Axis Measurement
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