Pb Free
1-CH Capacitive Touch Sensor LED Module With Self-Calibration
May 15, 2007
ADSemicon Touch sensor module
ADL-20M module
1-CH Capacitive Touch Sensor LED Module with Self-Calibration
General Description
Touch Sensor Module give out the output signal when it
detects the capacitance of the human body and objects.
Therefore, it is possible to detect by human touching even if it
will be installed at the internal space of any device which is made
by non-conductive like plastic.
This module is totally different from existing absolute value
comparison method, and when it is initial time with power on,
reference value is made and there is automatically calibration for
a gentle change to be affected by temperature and humidity. On
the other hand, in case there is sudden change of capacitive
value by such as human body touch and objects, it receives the
signal input to prevent the error.
This device use 5V and have consumption advantage with
approximately 100uA (when LED “off”, Stand-by).
When the power doesn’t works after the power approved,
give out a High signal, in case the action by touching, give out
LOW signal.
Since this is Open Drain Type, if use the Pull-up resistance on
the external, it is possible to have an interface directly with Logic
IC which use each difference voltage.
Module Type
Transparent electrode
(Front -Touch surface)
General Feature
1-Channel Capacitance Touch Sensor Module
with Auto-Calibration
LED included
6 pins including LED 2pin
RoHS compliant
Common-Mode Noise compliant
Application
Switch replacement
Human presence detection
Human interface for Toys & interactive games
Switch for light control
深圳市腾轩科技发展有限公司
科利科技（香港）有限公司
地址：福田区车公庙泰然工贸园202栋412
电话：0755-82814428
传真：0755-83041668
网站：www.axmicro.cn
技术支持：herit@axmicro.cn
heritwy@163.com
Bottom -Pin Number 1 marking
Pin Description
2007.5 ADsemicon
PIN Number
Name
Description
1
Anode
LED (+) Pin
Protection
2
Cathode
LED (-) Pin
3
Sync
Sync Pin
4
GND
Ground Pin
VDD
5
VDD
Power Pin
GND
6
OUT
Open Drain Output Pin
VDD/GND
VDD/GND
1
Pb Free
1-CH Capacitive Touch Sensor LED Module With Self-Calibration
Absolute Maximum Rating
Supply voltage
Continuous Power Dissipation
Storage Temperature
Operating Temperature
ESD protection
5.5V
800mW
-20 ~ 100℃
-10 ~ 70℃
2000V
Electrical Characteristics
Characteristics
Symbol
Operating Voltage
Vdd
Current consumption
Idd
Output Impedance
(@T A = 25℃)
Condition
Zo
( open drain )
Units
5.2
V
100
12
Vout=5.0v
30M
Isk,max
VDD=5V
T_cal
power on reset, VDD=5.0V
Ohm
4.0
1M
fosc
uA
mA
100m
Rsync
Internal OSC. Frequency
Max
5.0
Vout=0.0V
Self calibration time
value
Typ
4.5
VDD=5.0V
Output Max. Sink Current
Recommended Sync Resistor
Min
Sensitivity High @VDD=5.0V
3.0
Sensitivity Low @VDD=5.0V
2.5
sec
2M
20M
Ohm
7.5
-
MHz
6.5
Schematic Diagram
U1
TS01D
RESET
Ctouch
8
1
7
C1
SYNC
Cref
VDD
GND
OUT
R_BIAS
6
1u
CON6
OUT
VCC
GND
Sync
Cathode
Anode
6
5
4
3
2
1
J1
2007.5 ADsemicon
C2
100n
R2
open
220
R1
2
Touch
Pattern
3
5
4
1n
R4
330k
1
TP
C3
R3
330k
D2
D3
D4
Y -G(option)
Y -G(option)
Y -G(option)
C5
47p(option)
C4
20p(option)
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1-CH Capacitive Touch Sensor LED Module With Self-Calibration
Pb Free
Module Selection Guide
ADL-20M - 1
2
1
Class
H
L
Sensitivity
High (PC 3.0t ~ 4.0t)
Low (Glass 3.0t ~ 4.0t)
2
Class
Color Spec
LED Spec
B
Y
Blue
Blue
Yellow Green
Yellow Green
W
White
White
R
Red
Red
Module Marking Spec
Case Bottom color
Items
PCB Marking
ADL-20M-HB
White
B
ADL-20M –HY
White
Y
ADL-20M –HW
White
W
ADL-20M –HR
White
R
ADL-20M –LB
Brown
B
ADL-20M –LY
Brown
Y
ADL-20M –LW
Brown
W
ADL-20M -LR
Brown
R
External Color classification for each sensitivity
Sensitivity classification by bottom color
Sensitivity High -> White
Sensitivity Low -> Brown
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1-CH Capacitive Touch Sensor LED Module With Self-Calibration
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PCB Marking 위치
LED color marking
B
Physical Dimensions millimeters unless otherwise noted
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1-CH Capacitive Touch Sensor LED Module With Self-Calibration
Application Circuits
1. Typical Application (example)
R1
10k
ADL-20M
ADL-20M
R2
10k
To Micom input
LED_VCC
OUT
VCC
GND
SYNC
Cathode
Anode
+5V
OUT
VCC
GND
SYNC
Cathode
Anode
+5V
1
1
in1
in2
R4
option
R3
330k
R6
Q2
2N3904
R5
option
3
C2
1n
3
C1
1n
2
Q3
2N3904
1
10k
1
10k
R7
2
LED1
LED2
2. Key Scan Application (example)
Common
SW4
SW3
SW2
SW1
+12V
R5
+5V
47k
1
ADL-20M
OUT
VCC
GND
SYNC
Cathode
Anode
R1
2
Q1
4.7k
3
2N3906
LED1
R6
1
47k
ADL-20M
OUT
VCC
GND
SYNC
Cathode
Anode
R2
2
Q2
4.7k
3
2N3906
LED2
R7
1
47k
ADL-20M
OUT
VCC
GND
SYNC
Cathode
Anode
R3
Q3
2
4.7k
3
2N3906
LED3
R8
1
47k
ADL-20M
OUT
VCC
GND
SYNC
Cathode
Anode
R4
2
Q4
4.7k
3
2N3906
LED4
R9
2M
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1-CH Capacitive Touch Sensor LED Module With Self-Calibration
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Notes for designing of switch PCB & mass production regarding Capacitive
touch sensor.
1. Notes for designing PCBs
- Please separately design the power of touch sensor or use the power line with totally
isolated status under circumstance of using regularly excessive current.
-
It should be recommended to cover totality at around module GND shield
pattern on the touch panel of board to protect a strong noise from external
wireless device.
- In case use the excessive power capacitor, when the power is ON at once after
power OFF, the power is not down immediately but goes up again. Since the
module internal reset circuit is reset by external power, at that case, it cause the
error (non-working) due to the reset does not work. To protect that, it adds the
reset circuit in the power line of touch sensor as below picture1.
In case voltage ratio of R3 and R4 will be under 0.7V due to the power supply
down, Q2 is off, and then Q1 is off accordingly. At that time, Q3 is ON during
short time and VDD voltage goes down to a sufficient (proper) voltage for reset.
(Power Reset)
Picture 1. Reset Circuit example by using VDD discharge.
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1-CH Capacitive Touch Sensor LED Module With Self-Calibration
2N3906
Q1
3
1
Vout
+5V
Vin
2
R32
R33
4.7k
33k
3
R34
10k
R35
56k
2
Q3
2N3904
2
1
1
3
Q2
2N3904
R36
10k
Picture 2. Other Reset Circuit use example.
Especially, PCB pattern of Module doesn’ t near to large current around and
connector wire.
- Please note that the module shouldn’ t been affected from external AC noise.
If the frequency is overlapped, it causes the error (Non-working). Internal
oscillation Frequency: 1.0MHz~5.0MHz (@VDD=5.0V)
- It should be recommended that a conductive material don’ t approach at
around module. In case conductor and conductor coating in panel, it’ s
impossible to guarantee about good working.
- Front panel combined status should be constantly maintain.
Since ADL-25M can be attachable, Sensitivity is changed by calibration if it
sticks or unsticks the panel. Therefore, in case use of ADL-25M, turn on the
power and test after closely fixing the panel combination.
-
Sync operation mode : multi-channel application
Sync function is used with multiple based various channels in one board and
have sequential sensitivity section(interval) for minimizing the interference affect
from around neighboring channel working. For that, it bundle one like No. 3
Sync pin of each other module, and it connect one resistance(Sync resistance)
between bundled place and GND. Then, Channels that share Sync resistance
don’ t work at various points at one time, works sequential and then essentially
protect the noise from neighboring channel.
The following are Notes points regarding use of Sync function.
1) It is proper to use with 2MΩ of Sync share resistance value.
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1-CH Capacitive Touch Sensor LED Module With Self-Calibration
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2) If Sync resistance will be sharing with various channels, accordingly the
sharing number increase, and then it causes the working delay. Therefore,
it’ s better to bundle proper number channel by testing.
3) It would be proper that Sync Pin is used one bundle, centralizing key
(button) to be bunched at one place, and If possible, it identically designs
with equivalent impedance of Sync resistance from each Sync Pin.
LED_VCC
+5V
ADL-20M
OUT
VCC
GND
SYNC
Cathode
Anode
OUT1
LED1
ADL-20M
OUT
VCC
GND
SYNC
Cathode
Anode
OUT2
LED2
R1
2M
Picture 3. Sync Mode Application (example)
2. Material use Notes
1) Panel material
- Material composition such as currently approved glass, acryl should be always
constant.
(It should be same as that of initial approved sample)
- Panel thickness should be always constant.
2) Paint for panel.
- Non-conductive material.
- It should be same as that of initial approved sample.( If the permittivity changes,
the sensitivity change accordingly)
3. Capacitive Sensor Storage Notes
1)
Temperature and humidity
-
Support of Normal temperature, normal humidity.
(Especially, it shouldn’ t have water in inner or outer of case.)
2)
Attention to the electrostatic
3)
Attention to mechanical pressure
- Prevention of deformation of Pin or Case
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1-CH Capacitive Touch Sensor LED Module With Self-Calibration
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4. Notes for production
1)
Soldering
- Attention for flux not to contact Case or Touch place when soldering.
- Case shouldn’ t be changed by High temperature. (Heat resisting
temperature is about Max. 100℃.)
2)
Working
- It should be controlled not to contact foreign objects to transparent electrode
of case upper place.
- It doesn’ t be scratched at transparent electrode. (Attention of resistance
film breakage of transparent electrode.)
5. Notes for test
1)
Power voltage
- Work with DC 5.0 V.
2) Connect 10KOhm Pull-up resistance to separate 5V line from external of module,
and confirmation of Active Low.
3) Confirm again the thickness of panel compared to Spec when testing
4)
Perform a testing after closely fixing panel
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