ETC ADA03

ADA03 Capacitive Touch Sensor with Self-Calibration mode
Dec. 2004
Chemtronics
ADA03
1-CH Capacitive Touch Sensor with Self-Calibration Mode
General Description
General Feature
1-Channel Capacitive Sensor with self calibration.
Projects a 'touch button' through any dielectric,
Sensitivity selection with a external capacitor.
Open-Drain Digital Output.
The ADA03 touch sensor is designed specifically for detecting
of capacitance variation in sense node, and it is detecting 0.1pF
capacitance difference as compared with average capacitance. It
will project a sense field through almost any dielectric material
and detect the capacitance variation in sense node. Its sense
Application
module can be sealed from water or dust perfectly.
Fluid level sensing
Switch replacement
Human presence detection
Human interface for Toys & interactive games
Switch for light controls.
Membrane switch replacement
Sealed control panels, keypads
Also the device works in the very low power condition, supply
voltage, 2.5V and 30uA.
Package (SOT26)
Output
R_bias
ADA03
VDD
C_DEG
GND
Input_cs
PIN Description
Pin name
Output
Vdd
R_bias
Input_Cs
Gnd
C_deg
© 2004 chemtronics
Function
Output of Open Drain
Supply Voltage( 2.5V – 5.5V)
Set a Bias Current
Sensor Capacitance input
Ground
Sensitivity level selection( 5 level)
Protection
Vdd
Vdd
Vdd
Vdd
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ADA03 Capacitive Touch Sensor with Self-Calibration
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Absolute Maximum Rating
Battery supply voltage
Maximum voltage on any pin
Maximum current on any PAD to avoid latch-up
Power Dissipation
Storage Temperature
Operating Temperature
Junction Temperature
ESD protection
Characteristics
Symbol
Supply Voltage
Vdd
Current consumption
Idmax
Power dissipation
Pd
6.5V
VDD+0.3
100mA
100mW
-50 ~ 150ଇ
-20 ~ 75ଇ
150ଇ
2000V
Test Condition
Min
Typ
Max
Units
2.2
-
6.5
V
-20ଇ < Ta < +75ଇ, Vdd = 5V
-
120
-20 ~ 75ଇ, Vdd = 5V
-
-
uA
200
mW
Max
Units
Electrical Characteristics
TA = 25ଇ
Characteristics
Symbol
Operating Voltage
Vdd
Current consumption
Output Impedance
( open drain )
Zo
Isk
Input capacitance range
Cs
Min
Typ
2.5
Idd
Output Sink Current
Minimum detective
Condition
5.5
V
VDD=5.0V, Rb=500K
100
uA
VDD=2.5V, Rb=500K
40
uA
delta Cs > 0.1pF
10
delta Cs < 0.1pF
100M
VDD=5V, Rb=500K
Ohm
4.0
1.0
mA
4.0
pF
delta_Cs
Cs = 4pF
0.1
pF
Output hold time
T_hold
delta Cs > 0.1pF, Rb=500K
60
sec
Self calibration time
T_cal
capacitance
Bias resistance
Sensitivity
Selection
power on reset, VDD=5.0V,
Rb=300K
0.25
sec
Rb
VDD=5.0V
300
500
650
Kohm
Note1
VDD=2.5V
200
300
450
Kohm
Vdd=2.5V
Vdd=3.3V
Vdd=5.0V
Cdeg
Note2
Very High Sensitivity
0
0
0
pF
High Sensitivity
220
200
180
pF
Medium Sensitivity
440
400
360
pF
Low Sensitivity
880
800
750
pF
Note1 : Lower Rb is recommended in noisy condition.
Note2 : Cdeg should be in +/- 5% tolerance.
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Lead Free !
ADA03 Capacitive Touch Sensor with Self-Calibration
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Application Circuit
Cdeg
OUTPUT
C_DEG
Output
Rpull_up
ADA03
VDD
VDD
GND
Cx
Rb
R_bias
Input_cs
Cb
Cs
Touch Pad
(7x7mm)
Note1 : For stable operation, Cb should be selected 1.2nF.
Note2 : Cx will help to set a grade of sensitivity for fine tuned level if Cdeg level selected is not enough.
Note3 : If Supply Voltage is not stable, the chip will not operate properly.
Supply Current vs Bias Resistance
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Lead Free !
ADA03 Capacitive Touch Sensor with Self-Calibration
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Package Physical Dimensions millimeters unless otherwise noted
SOT-26(2.9 x 1.6 x 1.1mm)
Recommended Soldering Profiles
Wave Soldering
Ramp Up ( C/sec )
Solder Temperature
Dwell Time
Ramp Down
Wave Solder
4 C/sec
255 C
3 seconds
4 C/sec
Recommended
Maximum
Maximum
Recommended
IR Convection / Vapor Phase Reflow – Surface Mount
Ramp Up ( C/sec )
Solder Temperature
Dwell Time
Ramp Down
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Recommended
Maximum
Maximum
Recommended
Convection / IR
2 C/sec
235 C
15 seconds
2 C/sec
Vapor Phase
2 C/sec
230 C
60 seconds
2 C/sec
4
Lead Free !
ADA03 Capacitive Touch Sensor with Self-Calibration
͵ΖΔ͑͟ ͣͥ͑͑͡͡
MARKING SPECIFICATION
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LIFE SUPPORT POLICY
CHEMTRONICS
PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT
DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT AND GENERAL COUNSEL OF
CHEMTRONICS CORPORATION.
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