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AK4186 Datasheet(PDF) 8 Page - Asahi Kasei Microsystems

Part # AK4186
Description  Low Power Touch Screen Controller with I2C Interface
Download  33 Pages
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Manufacturer  AKM [Asahi Kasei Microsystems]
Direct Link  http://www.akm.com
Logo AKM - Asahi Kasei Microsystems

AK4186 Datasheet(HTML) 8 Page - Asahi Kasei Microsystems

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[AK4186]
Status of Driver Switch
ADC input (
ΔAIN)
Reference Voltage (
ΔVREF)
Channel Selection
Ref. Mode
TL-Driver
BR-Driver
AIN+
AIN-
VREF+
VREF-
X-axis Measure
ON
OFF
WIPER
TL
BR
TL
DFR
Y-axis Measure
OFF
ON
WIPER
BR
TL
BR
DFR
Table 3. 5線式タッチスクリーン測定モード
タッチスクリーンの位置検出
1. 4線式タッチスクリーンの位置検出
タッチスクリーンの位置検出は、スクリーンの一方の軸
(例えば、XP, XN 間)に電圧を印可し、他方の軸(例え
ば、
YP)で検出される電位を測定することで得られます。位置検出は、X 軸・Y 軸の座標を計算する必要があ
るため、最低
2 回の A/D 変換が必要です。
タッチパネルが押されると破線部分で
X-plate、Y-plate が接続されます。
X+
X-
X-Plate (Top side)
Y-Plate (Bottom side)
c) 4-wire Touch Screen Construction
X-Plate
Y-Plate
X-Plate
Y+
Y-
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
VCC
VCC
Touch Screen
Y-Plate
Figure 3. 4線式位置測定回路
MS1068-J-04
2011/03
- 8 -


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