TTP223 Datasheet PDF - TT

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TTP223
TT

Part Number TTP223
Description 1 KEY TOUCH PAD DETECTOR IC
Page 11 Pages


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Preliminary
TTP223
1 KEY TOUCH PAD DETECTOR IC
GENERAL DESCRIPTION
The TTP223 is a touch pad detector IC which offers 1 touch key. The touching detection IC is
designed for replacing traditional direct button key with diverse pad size. Low power consumption
and wide operating voltage are the contact key features for DC or AC application.
FEATURES
ƒ Operating voltage 2.0V~5.5V
ƒ Operating current @VDD=3V, no load, SLRFTB=1
At low power mode typical 1.5uA, maximum 3.0uA
At fast mode typical 3.5uA, maximum 7.0uA
@VDD=3V, no load, SLRFTB=0
At low power mode typical 2.0uA, maximum 4.0uA
At fast mode typical 6.5uA, maximum 13.0uA
ƒ The response time max about 60mS at fast mode, 220mS at low power mode @VDD=3V
ƒ Sensitivity can adjust by the capacitance(0~50pF) outside
ƒ Have two kinds of sampling length by pad option(SLRFTB pin)
ƒ Stable touching detection of human body for replacing traditional direct switch key
ƒ Provides Fast mode and Low Power mode selection by pad option(LPMB pin)
ƒ Provides direct modetoggle mode by pad option(TOG pin)
Open drain mode by bonding option, OPDO pin is open drain output,
Q pin is CMOS output
ƒ All output modes can be selected active high or active low by pad option(AHLB pin)
ƒ Have the maximum on time 100sec by pad option(MOTB pin)
ƒ Have external power on reset pin(RST pin)
ƒ After power-on have about 0.5sec stable-time, during the time do not touch the key pad,
And the function is disabled
ƒ Auto calibration for life
And the re-calibration period is about 4.0sec, when key has not be touched
APPLICATION
ƒ Wide consumer products
ƒ Water proofed electric products
ƒ Button key replacement
08’/04/07
Page 1 of 11
Ver :1.0
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BLOCK DIAGRAM
Preliminary
Sensor oscillator
I circuit
Sensor &
Reference
detecting circuit
LPMB
MOTB
SLRFTB
RST
Timing counter
System oscillator
circuit
Touch detecting
circuit
Key-on & timing
control
TTP223
Output
mode
&
driver
circuit
Q
OPDO
TOG
AHLB
PAD DESCRIPTION
Pad No.
1
2
3
4
5
6
7
8
9
10
11
Pad Name
Q
OPDO
VSS
LPMB
TOG
VDD
AHLB
RST
SLRFTB
MOTB
I
I/O Type
Pad Description
O
O
P
I-PH
I-PL
P
I-PL
I-PL
I-PH
I-PH
I/O
CMOS output pin
Open drain output pin
Negative power supply, ground
Low power mode selection,
1=>Fast mode; 0=>Low power mode
Output type option pin,
1=>Toggle mode; 0=>Direct mode
Positive power supply
Output active high or low selection,
1=>Active low; 0=>Active high
External power on reset pin
Selecting the sampling length,
1=>about 1.6msec; 0=>about 3.2msec
Maximum on time 100sec selection,
1=>Disable, 0=>Enable
Input sensor port
08’/04/07
Page 2 of 11
Ver :1.0
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Preliminary
ELECTRICAL CHARACTERISTICS
Absolute Maximum Ratings
Parameter
Symbol
Operating Temperature
TOP
Storage Temperature
TSTG
Power Supply Voltage
VDD
Input Voltage
VIN
NoteVSS symbolizes for system ground
Conditions
Ta=25°C
Ta=25°C
TTP223
Value
-20 ~ +70
-50 ~ +125
VSS-0.3 ~ VSS+5.5
VSS-0.3 ~ VDD+0.3
Unit
V
V
DC/AC Characteristics(Test condition at room temperature=25)
Parameter
Symbol
Test Condition
Min. Typ. Max. Unit
Operating Voltage
VDD
2.0 3 5.5 V
System oscillator
Sensor oscillator
Operating Current
Input Ports
Input Ports
Output Port Sink Current
Output Port Source Current
Output Response Time
Input Pin Pull-high Resistor
Input Pin Pull-low Resistor
FFAST
FLOW
FSEN
IOP
VIL
VIH
IOL
IOH
TR
RPH
RPL
VDD=3V
VDD=3V no load
- 512K -
16K
- 1M -
Hz
Hz
VDD=3V
SLRFTB
at low power mode =1
and output no load SLRFTB
=0
VDD=3V
SLRFTB
at fast mode
=1
and output no load SLRFTB
=0
Input Low Voltage
-
-
-
0
1.5 3.0
2.0 4.0
3.5 7.0 uA
6.5 13.0
- 0.2 VDD
Input High Voltage
0.8 - 1.0 VDD
VDD=3V, VOL=0.6V
- 8 - mA
VDD=3V, VOH=2.4V
- -4 - mA
VDD=3V, At fast mode
VDD=3V, At low power mode
VDD=3V,
(LPMB, MOTB, SLRFTB)
VDD=3V,
(TOG, AHLB)
VDD=3V,
(RST)
60
220 mS
35K ohm
28K
200K
ohm
08’/04/07
Page 3 of 11
Ver :1.0
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Preliminary
TTP223
FUNCTION DESCRIPTION
1. Sensitivity adjustment
The total loading of electrode size and capacitance of connecting line on PCB can affect the
sensitivity. So the sensitivity adjustment must according to the practical application on PCB. The
TTP223 offers some methods for adjusting the sensitivity outside.
1-1 by the electrode size
Under other conditions are fixed. Using a larger electrode size can increase sensitivity. Otherwise it
can decrease sensitivity. But the electrode size must use in the effective scope.
1-2 by the panel thickness
Under other conditions are fixed. Using a thinner panel can increase sensitivity. Otherwise it can
decrease sensitivity. But the panel thickness must be below the maximum value.
1-3 by the value of Cs (please see the down figure)
Under other conditions are fixed. When do not use the Cs to VSS, the sensitivity is most sensitive.
When adding the values of Cs will reduce sensitivity in the useful range (0Cs50pF).
VDD
ELECTRODE
Cs
VDD
Q
I OPDO
TOG
AHLB
LPMB
MOTB
SLRFTB
VSS RST
2. Output mode
The TTP223 has direct mode active high or low by AHLB pad option. And has toggle mode by
TOG pad option. Another has open drain mode by bonding option. Pad Q is digital output, pad
OPDO is open drain output.
TOG
0
0
1
1
AHLB Pad Q option features
0 Direct mode,
CMOS active high output
1 Direct mode,
CMOS active low output
0 Toggle mode,
Power on state=0
1 Toggle mode,
Power on state=1
Pad OPDO option features
Direct mode,
Open drain active high output
Direct mode,
Open drain active low output
Toggle mode,
Power on state high-Z, Active high
Toggle mode,
Power on state high-Z, Active low
08’/04/07
Page 4 of 11
Ver :1.0
Free Datasheet http://www.datasheet4u.com/



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