TS02NT [ADI]
韩国ADS二键触摸按键IC 2-Channel Self Calibration Capacitive Touch Sensor;
| 型号： | TS02NT |
| 厂家： | 
ADI |
| 描述： | 韩国ADS二键触摸按键IC 2-Channel Self Calibration Capacitive Touch Sensor |
| 文件： | 总13页 (文件大小：313K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
2-Channel Self Calibration Capacitive Touch Sensor
SPECIFICATION V1.2
August 2006
ADSemiconductor Confidential
ADSemiconductor®
TS02N (2-CH Sensitivity Calibration Capacitive Touch Sensor)
1 Specification
1.1 General Feature
2-Channel capacitive touch sensor with self sensitivity calibration
Low power consumption
Sync function for parallel operation
Adjustable internal clock frequency with external resister
Open-drain digital output
Embedded noise elimination circuit
Embedded Internal power reset circuit
RoHS compliant 8SOP package
1.2 Application
Home appliance
Membrane switch replacement
Human interface for toys & interactive games
Sealed control panels, keypads
1.3 Package (8 SOP)
TS02N 8SOP (Drawings not to scale)
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TS02N (2-CH Sensitivity Calibration Capacitive Touch Sensor)
2 Pin Description (8 SOP)
PIN Number
Name
I/O
Description
Self sense operation signal output
Peripheral sense operation signal input
Internal bias adjust input
Supply ground
Protection
VDD/GND
1
SYNC
Analog Input
2
3
4
5
6
R_BIAS
GND
CS1
Analog Input
Ground
VDD/GND
VDD
Analog Input
Analog Input
Power
Sense channel 1
VDD/GND
VDD/GND
GND
CS2
Sense channel 2
VDD
Power (2.5V ~ 5.0V)
Ch2 touch detect output
Open drain output (Active Low)
Ch1 touch detect output
Open drain output (Active Low)
7
8
OUT2
OUT1
Digital Output
Digital Output
VDD/GND
VDD/GND
3 Absolute Maximum Rating
Supply voltage
5.5 V
VDD+0.3 V
Maximum voltage on any pin
Maximum current on any PAD
Continuous power Dissipation
Storage Temperature
100mA
800mW
-50 ~ 150℃
-20 ~ 75℃
150℃
Operating Temperature
Junction Temperature
Note Unless otherwise noted, all above are operated in normal temperature
4 ESD & Latch-up Characteristics
4.1
ESD Characteristics
Mode
Polarity
Max
2000V
2000V
2000V
200V
200V
200V
800V
Reference
VDD
VSS
H.B.M
Pos / Neg
P to P
VDD
M.M
Pos / Neg
Pos / Neg
VSS
P to P
DIRECT
C.D.M
4.2
Latch-up Characteristics
Mode
Polarity
Max
200mA
-200mA
8.0V
Test Step
25mA
Positive
Negative
Positive
I Test
V supply over 5.0V
1.0V
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ADSemiconductor®
TS02N (2-CH Sensitivity Calibration Capacitive Touch Sensor)
5 Electrical Characteristics
▪ VDD=3.3V, RB =510k, (Unless otherwise noted), TA = 25℃
Characteristics
Symbol Test Condition
Min
2.5
Typ
3.3
Max
5.0
Units
V
Operating supply voltage
VDD
VDD= 3.3V RB=510k
-
-
50
75
Current consumption
IDD
㎂
VDD= 5.0V RB=510k
110
165
Output maximum sink
current
TA = 25℃
IOUT
-
-
-
4.0
㎃
㎊
Sense input
CS1
CS2
10
100
capacitance range
Note1
Sense input
RS
-
200
-
1000
-
Ω
resistance range
Minimum detectable
ΔC
CS = 10pF
0.2
㎊
capacitance difference
ΔC > 0.2pF
-
-
12
30M
100
80
-
-
Output impedance
(open drain)
Zo
TCAL
RB
Ω
ΔC < 0.2pF
VDD = 3.3V RB = 510k
VDD = 5.0V RB = 510k
VDD = 3.3V
-
-
Self calibration time
after power on
ms
kΩ
-
-
Recommended bias
200
330
510
620
820
1200
resistance range
Note2
VDD = 5.0V
Maximum bias
capacitance
CB_MAX
RSYNC
-
1
820
2
1000
20
pF
Recommended sync
resistance range
MΩ
Note 1:The sensitivity can be increased with lower CS value.
The recommended value of CS is 10pF when using 3T PC(Poly Carbonate) cover and
10 ㎜ x 7 ㎜ touch pattern.
Note 2: The lower RB is recommended in noisy condition.
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TS02N (2-CH Sensitivity Calibration Capacitive Touch Sensor)
6 Implementation of TS02N
6.1 R_BIAS implementation
VDD
CB
RB
R_BIAS <<
The R_BIAS is connected to the resistor to decide the oscillator and internal bias current. The
sensing frequency, internal clock frequency and current consumption are therefore able to be
adjusted with RB. A voltage ripple on R_BIAS can make critical internal error, so CB connected to
the VDD (not GND) is recommended. (The typical value of CB is 820pF and the maximum Value
is 1nF.)
IDD. [uA]
200
180
2.5 V
160
3.3 V
5.0 V
140
120
100
80
60
40
20
0
100
200
300
400
500
600
700
800
900
RBIAS [kΩ]
Current consumption curve
The current consumption curve of TS02N is represented in accordance with RB value as above.
The lower RB requires more current consumption but it is recommended in noisy application. For
example, refrigerator, air conditioner and so on.
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TS02N (2-CH Sensitivity Calibration Capacitive Touch Sensor)
6.2 CS implementation
RS2
CS2 <<
Touch PAD2
Touch PAD1
CS2
RS1
CS1 <<
CS1
The parallel capacitor CS2 is added to CS2 and CS1 to CS1 to adjust sensitivity. The sensitivity
will be increased when smaller value of CS2 and CS1 are used. (Ref. below Sensitivity Example
Figure) It could be useful in case detail sensitivity mediation is required. The TS02N has two
independent touch sensor input CS1 and CS2. Internal touch decision processes of CS1 and
CS2 are separated from each other. Therefore two channel touch key board can be designed
by using only one TS02N. RS1 and RS2 are serial connection resistors to avoid mal-function
from external surge and ESD. From 200Ω to 1kΩ is recommended for RS1 and RS2 values. The
size and shape of PAD might have influence on the sensitivity. The sensitivity will be optimal
when the size of PAD is approximately an half of the first knuckle (it’s about 10 ㎜ｘ 7 ㎜). The
connection line of CS1 and CS2 to touch PAD is recommended to be routed as short as
possible to prevent from abnormal touch detect caused by connection line.
Sensitivity Example Figure
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TS02N (2-CH Sensitivity Calibration Capacitive Touch Sensor)
6.3 SYNC implementation
Over two TS02N can work on the one application at the same time thanks to SYNC function
with this pin. The SYNC pulse prevents over two sensing signal from interfering with each other.
RSYNC is pull-down resistor of SYNC pin. Too big value of RSYNC makes the SYNC pulse falling
delay, and too small value of RSYNC makes rising delay. Typical value of RSYNC is 2MΩ.The Sync
pin should be implemented as below. TS02N also can be used with the other TSxx series by
employing this SYNC function.
The SYNC pin should be tied to GND in case of low sensitivity application. In this case, the
sensitivity will be decreased with an half of that in normal use and the SYNC function is not
available.
SYNC <<
1st TS02N
RSYNC
SYNC <<
2nd TS02N or TS**
SYNC pin option
Connection
Operation
RSYNC
Normal SYNC operation with the other TSXX series / High
Sensitivity Application
Connection
GND
VDD
No SYNC / Low Sensitivity Application
Forbidden
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TS02N (2-CH Sensitivity Calibration Capacitive Touch Sensor)
6.4 OUTPUT implementation
VDD
ROUT2
ROUT1
OUTPUT2
OUTPUT1
OUT2 <<
OUT1 <<
The OUT1 and OUT2 have open drain output structure. For this reason, the connection of pull-
up resistor ROUT is required between OUT1, OUT2 and VDD. The maximum output sink current is
4mA, so over a few kΩ must be used as ROUT1 and Rout2. Normally 10kΩ is used as ROUT1 and
Rout2. The reset value of OUT1 and OUT2 is high in normal situation, and the value is low when
a touch is detected on CS1 or CS2.
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TS02N (2-CH Sensitivity Calibration Capacitive Touch Sensor)
7 Recommended Application
Two channel touch key board can be designed by using only one TS02N. The TS02N is
embedded intelligent internal power reset circuit that makes possible to save circuit cost
because of reducing external components for reset.
The sensitivity calibration operation can help to prevent abnormal detection caused by external
noise, temperature variation, and supply voltage drop.
TS02N Application Example Circuit
VDD periodic voltage ripple over 50mV and the ripple frequency is lower than 10 kHz can
cause wrong sensitivity calibration. To prevent above problem, power (VDD, GND) line of touch
circuit should be separated from other circuit. Especially LED driver power line or digital
switching circuit power line certainly should be treated to be separated from touch circuit.
When TS02N used in noisy environment, Lower RB is recommended.
In PCB layout, RB should not be placed on touch pattern. If not, CB has to be connected. The
RB pattern should be routed as short as possible.
The CS pattern also should be routed as short as possible and the width of line might be about
0.25mm.
The capacitor that is between VDD and GND is an obligation. It should be located as close as
possible from TS02N.
The CS pattern routing should be formed by bottom metal (opposite metal of touch PAD).
The empty space of PCB must be filled with GND pattern to strengthen GND pattern and to
prevent external noise from interfere with sensing frequency
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TS02N (2-CH Sensitivity Calibration Capacitive Touch Sensor)
7.1 Example – Power Line Split Strategy PCB Layout
A. Not split power Line (Bad power line design)
The noise that is generated by AC load or relay can be loaded at 5V power line.
A big inductance might be appeared in case of the connection line between main board and
display board is too long, moreover the voltage ripple could be generated by LED (LCD)
display driver at VDD (5V).
B. Split power Line (One 5V regulator used) – Recommended
C. Split power Line (Separated 5V regulator used) – Strongly recommended
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TS02N (2-CH Sensitivity Calibration Capacitive Touch Sensor)
7.2 Example – PCB Layout (2 Channel Touch button with LED Display)
J1
VDD
OUT1
OUT2
1
2
3
4
CON1
RSYNC
2M
U1
CB
820pF
ROUT1 1k
ROUT2 1k
LED1
LED2
SYNC
OUT1
OUT2
VDD
VDD
RB
510k
1
2
3
4
8
7
6
5
SYNC
OUT1
R_BIAS OUT2
VDD CVDD
1uF
GND
VDD
CS2
TP2
CS1
TP1
PAD
RS1
200
CS1
10pF
TS02N
RS2
200
CS2
10pF
PAD
Schematic for PCB layout
Components placement
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TS02N (2-CH Sensitivity Calibration Capacitive Touch Sensor)
8 PACKAGE DESCRIPTION
8.1 Mechanical Drawing
Dimensions in millimeters
8.2 Marking Description
Device Code : T S 0 2 N
Type of version
Channel Number
Touch Switch Group
Weekly Code : YY ZZ
Manufacturing Year
Manufacturing Week
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TS02N (2-CH Sensitivity Calibration Capacitive Touch Sensor)
NOTES:
LIFE SUPPORT POLICY
AD SEMICONDUCTOR’S 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 AD SEMICONDUCTOR CORPORATION
The ADS logo is a registered trademark of ADSemiconductor
ⓒ 2006 ADSemiconductor – All Rights Reserved
www.adsemicon.com
www.adsemicon.co.kr
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