TS08P
8-Channel Self Calibration Capacitive Touch Sensor
SPECIFICATION V1.7
April 2009
Confidential
ADSemiconductor
ADSemiconductor®
TS08P (8-CH Auto Sensitivity Calibration Capacitive Touch Sensor)
1 Specification
1.1 General Feature
8-Channel capacitive sensor with auto sensitivity calibration
Selectable output operation mode (single output /multi output / dual single output)
Selectable output level (active high / active low / analog voltage output)
Uniformly adjustable 9 step sensitivity
3 Step internal calibration speed selections
Sync function for parallel operation
5 SYNC pins for various option selections
Almost no external component needed
Open-drain digital output
Low current consumption
Embedded common and normal noise elimination circuit
RoHS compliant 24QSOP and 24QFN package
1.2 Application
Home application
Membrane switch replacement
Sealed control panels, keypads
Door key-lock matrix application
Touch screen replacement application
1.3 Package (24QSOP/24QFN)
TS08P(24QSOP)
TS08P-Q(24QFN)
※ Drawings not to scale
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ADSemiconductor®
TS08P (8-CH Auto Sensitivity Calibration Capacitive Touch Sensor)
2 Pin Description
2.1 TS08P-Q(24QFN package)
Pin
Number
1
Name
I/O
CS4
Analog Input
Digital Input
/Output
Analog Input
Analog Input
Analog Input
Analog Input
Digital Input
/Output
2
SYNC1
3
4
5
6
CS5
CS6
CS7
CS8
7
SYNC2
8
9
DUMMY
VSS
10
SYNC4
11
SYNC5
12
OUT1
13
14
15
16
17
18
OUT2
OUT3
OUT4
OUT5
OUT6
OUT7
19
OUT8
20
SYNC3
21
22
23
24
:
:
Note 3 :
Note 4 :
Note 5 :
Note 1
Note 2
Ground
Digital Input
/Output
Digital Input
/Output
Digital Output
/Analog Output
Digital Output
Digital Output
Digital Output
Digital Output
Digital Output
Digital Output
Digital Output
/Analog Output
Digital Input
/Output
Description
Protection
CH4 capacitive sensor input
Sensitivity selection input 1 (Note 1)
Sync pulse input /output 1
CH5 capacitive sensor input
CH6 capacitive sensor input
CH7 capacitive sensor input
CH8 capacitive sensor input
Sensitivity selection input 2 (Note 1)
Sync pulse input /output 2
VDD/GND
No Connection (Note 2)
VDD/GND
Supply ground
Output level selection input (Note 3)
Sync pulse input /output 4
Internal calibration speed selection
input (Note 4)
Sync pulse input /output 5
CH1 parallel output (Open drain)
Ch1, 2, 3, 4 analog output
CH2 parallel output (Open drain)
CH3 parallel output (Open drain)
CH4 parallel output (Open drain)
CH5 parallel output (Open drain)
CH6 parallel output (Open drain)
CH7 parallel output (Open drain)
CH8 parallel output (Open drain)
Ch5, 6, 7, 9 analog output
Output mode selection input (Note 5)
Sync pulse input /output 3
VDD
Power
Power (2.5V~5.5V)
CS1
Analog Input
CH1 capacitive sensor input
CS2
Analog Input
CH2 capacitive sensor input
CS3
Analog Input
CH3 capacitive sensor input
Refer to 6.3.2 Sensitivity selections.
DUMMY pin should be no connection.
Refer to 6.3.4 Output level selections.
Refer to 6.3.5 Internal calibration speed selections.
Refer to 6.3.3 Output mode selections.
ADSemiconductor Confidential
VDD/GND
VDD/GND
VDD/GND
VDD/GND
VDD/GND
VDD/GND
VDD
VDD/GND
VDD/GND
VDD/GND
VDD/GND
VDD/GND
VDD/GND
VDD/GND
VDD/GND
VDD/GND
VDD/GND
VDD/GND
GND
VDD/GND
VDD/GND
VDD/GND
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ADSemiconductor®
TS08P (8-CH Auto Sensitivity Calibration Capacitive Touch Sensor)
2.2 TS08P(24QSOP package)
Pin
Number
1
2
3
Name
I/O
CS6
CS7
CS8
Analog Input
Analog Input
Analog Input
Digital Input
/Output
4
SYNC2
5
6
DUMMY
VSS
7
SYNC4
8
SYNC5
9
OUT1
10
11
12
13
14
15
OUT2
OUT3
OUT4
OUT5
OUT6
OUT7
16
OUT8
17
SYNC3
18
19
20
21
22
VDD
CS1
CS2
CS3
CS4
23
SYNC1
24
CS5
:
:
Note 3 :
Note 4 :
Note 5 :
Note 1
Note 2
Refer to
DUMMY
Refer to
Refer to
Refer to
Ground
Digital Input
/Output
Digital Input
/Output
Digital Output
/Analog Output
Digital Output
Digital Output
Digital Output
Digital Output
Digital Output
Digital Output
Digital Output
/Analog Output
Digital Input
/Output
Power
Analog Input
Analog Input
Analog Input
Analog Input
Digital Input
/Output
Analog Input
Description
Protection
CH6 capacitive sensor input
CH7 capacitive sensor input
CH8 capacitive sensor input
Sensitivity selection input 2 (Note 1)
Sync pulse input /output 2
VDD/GND
VDD/GND
VDD/GND
No Connection (Note 2)
VDD/GND
Supply ground
Output level selection input (Note 3)
Sync pulse input /output 4
Internal calibration speed selection
input (Note 4)
Sync pulse input /output 5
CH1 parallel output (Open drain)
Ch1, 2, 3, 4 analog output
CH2 parallel output (Open drain)
CH3 parallel output (Open drain)
CH4 parallel output (Open drain)
CH5 parallel output (Open drain)
CH6 parallel output (Open drain)
CH7 parallel output (Open drain)
CH8 parallel output (Open drain)
Ch5, 6, 7, 9 analog output
Output mode selection input (Note 5)
Sync pulse input /output 3
Power (2.5V~5.5V)
CH1 capacitive sensor input
CH2 capacitive sensor input
CH3 capacitive sensor input
CH4 capacitive sensor input
Sensitivity selection input 1 (Note 1)
Sync pulse input /output 1
CH5 capacitive sensor input
VDD/GND
VDD
VDD/GND
VDD/GND
VDD/GND
VDD/GND
VDD/GND
VDD/GND
VDD/GND
VDD/GND
VDD/GND
VDD/GND
VDD/GND
GND
VDD/GND
VDD/GND
VDD/GND
VDD/GND
VDD/GND
VDD/GND
6.3.2 Sensitivity selections.
pin should be no connection.
6.3.4 Output level selections.
6.3.5 Internal calibration speed selections.
6.3.3 Output mode selections.
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ADSemiconductor®
TS08P (8-CH Auto Sensitivity Calibration Capacitive Touch Sensor)
3 Absolute Maximum Rating
Battery supply voltage
6.0V
Maximum voltage on any pin VDD+0.3
Maximum current on any PAD 100mA
Power Dissipation
800mW
Storage Temperature
-50 ~ 150℃
Operating Temperature
-20 ~ 75℃
Junction Temperature
150℃
Note 6: Unless any other command is noted, all above are operated in normal temperature.
4 ESD & Latch-up Characteristics
4.1 ESD Characteristics
Mode
H.B.M
M.M
Polarity
Pos / Neg
Pos / Neg
Max
Reference
8000V
VDD
8000V
VSS
8000V
P to P
500V
VDD
500V
VSS
500V
P to P
500V
C.D.M
Pos / Neg
DIRECT
800V
4.2 Latch-up Characteristics
Mode
Polarity
Max
Positive
200mA
Negative
-200mA
Positive
8.0V
I Test
V supply over 5.0V
Test Step
25mA
1.0V
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ADSemiconductor®
TS08P (8-CH Auto Sensitivity Calibration Capacitive Touch Sensor)
5 Electrical Characteristics
▪ VDD=3.3V, (Unless otherwise noted), TA = 25℃
Characteristics
Symbol
Operating supply
voltage
VDD
Test Condition
VDD= 3.3V
Current consumption
IDD
VDD= 5.0V
Internal reset criterion
VDD voltage
Output maximum sink
current
Minimum detective
capacitance difference
Output impedance
(open drain)
Self calibration time
after system reset
Min
Typ
Max
Units
2.5
3.3
5.5
V
Slow calibration speed
-
60
100
Normal calibration speed
-
90
140
Fast calibration speed
-
130
210
Slow calibration speed
-
80
130
Normal calibration speed
-
110
180
Fast calibration speed
-
170
250
VDD_RST
TA = 25℃
-
-
0.3∙VDD
V
IOUT
TA = 25℃
-
-
4.0
㎃
0.1
-
-
㎊
ΔC > ΔCMIN
-
12
-
ΔC < ΔCMIN
-
30M
-
Slow calibration speed
-
100
-
Normal calibration speed
-
80
-
Fast calibration speed
-
60
-
ΔCMIN
Zo
TCAL
Ω
ms
Note 7:
The sensitivity can be decreased with higher parallel capacitance of CS pin including
parasitic capacitance made by neighbor GND or other pattern.
Note 8:
The series resistor(under 1kΩ) of CS can be used in noisy condition to avoid malfunction from external surge and ESD.
Note 9
㎂
: Slow calibration speed isn’t recommended if it has not problem of current consumption.
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ADSemiconductor®
TS08P (8-CH Auto Sensitivity Calibration Capacitive Touch Sensor)
6 TS08P Implementation
6.1 Typical current consumption
TS08P uses internal bias circuit, so internal clock frequency and current consumption is fixed
and no external bias circuit is needed. TS08P has three step optional calibrations speed. Faster
calibration speed needs more current consumption than slower calibration speed. The typical
current consumption curve of TS08P is represented in accordance with VDD voltage as below.
Internal bias circuit can make the circuit design simple and reduce external components.
IDD [uA]
180
160
140
120
100
80
60
Fast
Normal
40
Slow
20
0
2.0
2.5
3.0
3.5
VDD [V]
4.0
4.5
5.0
5.5
Typical current consumption curve of TS08P
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ADSemiconductor®
TS08P (8-CH Auto Sensitivity Calibration Capacitive Touch Sensor)
6.2 CS implementation
TS08P has 9 step selections of sensitivity and internal protection circuit so external components
of CS pins such as series resistor or parallel capacitor isn’t necessary. The parallel parasitic
capacitance of CS pins caused by touch line, touch pad and neighbor GND or other pattern
may affect sensitivity. The sensitivity will be decreased when bigger parallel parasitic
capacitance of CS pin is added.
Parallel capacitor (CS1~S8) of CS pin is useful in case of detail sensitivity mediation is required
such as for complementation sensitivity difference between channels. Same as above parallel
parasitic capacitance, sensitivity will be decreased when a big value of parallel capacitor
(CS1~S8) is used. Under 50pF capacitor can be used as sensitivity meditation capacitor and a
few pF is usually used. The RS, serial connection resistor of CS pins, may be used to avoid
mal-function from external surge and ESD. (It might be optional.) From 200Ω to 1kΩ is
recommended for RS. Refer to below CS pins application figure.
RS8
CS8
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