电容式触摸按键设计指南
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Capacitive Touch Sensor
Design Guide
October 16, 2008
Copyright © 2007-2008 Yured International Co., Ltd.1YU-TECH-0002-012-1
(3)
(3)
(5)
(9)
(11)
(11)
(17)
(20)
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1.
2.
( ) 3M 468MP NITTO 500 818
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3.
4.
Front Panel
Sensor Pad
Sensor Pad
Electroplating
Or
Spray Paint
Nothing
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1. (FPC) ITO (Membrane)
ITO ITO ( 10K )
FPC ITO MEMBRANE
PCB
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2.ITO LCD ITO ( 10K )
3. 1mm 8mm ( 8mm X 8mm )
1mm 8mm X 8mm 2mm 10mm X 10mm 3mm 12mm X 12mm 4mm 15mm X 15mm 5mm
18mm X 18mm
( ) 196.85 mil (5mm)
0.254mm(10mil)
2mm 5mm
2mm
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4.
5. 20mil (0.508mm) IC 20mil (0.508mm) 10mil (0.254mm) 78.74 mil (2mm)
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6. IC 30cm
20cm IC 7. LED( )
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1.
LCD ( ) 2mm
2.
RF 6mm ( )
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3.
( 10mm) ( )
4.
1 2mm
IC IC IC
1. IC
2. 10M ±10%
±10% (1uF) (22pF) ±20%
3. ±500mV(VDD=5V) ±300mV(VDD=3V) ±100mV/1V(VDD)
IC 2.5V
4. 8MHz RC OSCI (C =22pF)
RC OSCI IC IC
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5.
CHIP OP VDD VSS OP+R VDD VSS (R 47K 100K )
6. Button (GPIO) 1 (Active-High) 0
(Active-Low) Button 1 0 1 0 1 0
7. Open-Drain GPIO 0 (Vss) 1
Wire AND ( )
IC Open-Drain
8. Toggle Toggle (ON)
(OFF) ON 0 1 OFF 0 1 (Mode)
OUTn Active
INPn T T
Active
T T
Copyright © 2007-2008 Yured International Co., Ltd.13YU-TECH-0002-012-1
9. Inter-Lock Toggle Push-Pull Active-Low OUT1
INP1 OUT2
OUT3 OUT4 OUT3 OUT2 OUT4
10. (INP) 10M (GND) 10M
22pF 256uS IC 30cm 20cm
KEY
INP
10M
Copyright © 2007-2008 Yured International Co., Ltd.14YU-TECH-0002-012-1