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)
Copyright © 2007-2008 Yured International Co., Ltd.2YU-TECH-0002-012-1
Copyright © 2007-2008 Yured International Co., Ltd.3
YU-TECH-0002-012-1
1.
2.
( ) 3M 468MP NITTO 500 818
Copyright © 2007-2008 Yured International Co., Ltd.4
YU-TECH-0002-012-1
3.
4.
Front Panel
Sensor Pad
Sensor Pad
Electroplating
Or
Spray Paint
Nothing
Copyright © 2007-2008 Yured International Co., Ltd.5
YU-TECH-0002-012-1
1. (FPC) ITO (Membrane)
ITO ITO ( 10K )
FPC ITO MEMBRANE
PCB
Copyright © 2007-2008 Yured International Co., Ltd.6
YU-TECH-0002-012-1
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
Copyright © 2007-2008 Yured International Co., Ltd.7
YU-TECH-0002-012-1
4.
5. 20mil (0.508mm) IC 20mil (0.508mm) 10mil (0.254mm) 78.74 mil (2mm)
Copyright © 2007-2008 Yured International Co., Ltd.8
YU-TECH-0002-012-1
6. IC 30cm
20cm IC 7. LED( )
Copyright © 2007-2008 Yured International Co., Ltd.9
YU-TECH-0002-012-1
1.
LCD ( ) 2mm
2.
RF 6mm ( )
Copyright © 2007-2008 Yured International Co., Ltd.10
YU-TECH-0002-012-1
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
Copyright © 2007-2008 Yured International Co., Ltd.11YU-TECH-0002-012-1
Copyright © 2007-2008 Yured International Co., Ltd.12
YU-TECH-0002-012-1
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
Copyright © 2007-2008 Yured International Co., Ltd.15
YU-TECH-0002-012-1
11. IC ( IC ) IC
IC SLEEP VDD VSS HOST 0 IC HOST 1 IC IC 256mS 384mS SLEEP 1 IC
Copyright © 2007-2008 Yured International Co., Ltd.16
YU-TECH-0002-012-1
12. 6.5 IC
Touch INPn OUTn
Active Touch Active 13.
(INP) 3.2
IC 14. IC 16mS 24mS Active-Low
Pull-High Active-High Pull-Low
15. MODE VSS(GND) R=47K
C=0.001uF(102) C=0.01uF(103) IC OSCI 250KHz ( 50%)
MODE
R
Copyright © 2007-2008 Yured International Co., Ltd.
17
YU-TECH-0002-012-1
1.
INP 10M OSCI RC Bypass IC IC ( ) 2. OSCI RC
3.
ITO ITO 10K
4.
IC ( ) 196.85 mil (5mm)
Layer2
Layer 1Layer 1
0.254mm(10mil)2mm 2mm
5mm
5mm
5. 1mm 8mm ( 8mm X
8mm)
1mm8mm X 8mm
2mm10mm X 10mm
3mm12mm X 12mm
4mm15mm X 15mm
5mm18mm X 18mm
( ) 196.85 mil (5mm)
0.254mm(10mil)
5mm 2mm
5mm
2mm 0.508mm
(20mil)
2mm
5mm
0.254mm(10mil)
2mm
Copyright © 2007-2008 Yured International Co., Ltd.18YU-TECH-0002-012-1
6. INP 10mil (0.254mm) IC 20mil (0.508mm)
20mil (0.508mm) 78.74 mil (2mm) 196.85 mil (5mm) IC 30cm 20cm
Copyright © 2007-2008 Yured International Co., Ltd.19YU-TECH-0002-012-1
Copyright © 2007-2008 Yured International Co., Ltd.20
YU-TECH-0002-012-1
OSCI 8MHz VDD ±100mV/1V (VDD)。