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TONTEK

TTP224 Datasheet Preview

TTP224 Datasheet

4 KEY TOUCH PAD DETECTOR IC

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Preliminary
TTP224/TTP224N
TonTouchTM
4 KEY TOUCH PAD DETECTOR IC
GENERAL DESCRIPTION
The TTP224/TTP224N TonTouchTM IC is capacitive sensing design specifically for touch pad
controls. The device built in regulator for touch sensor. Stable sensing method can cover diversity
conditions. Human interfaces control panel links through non-conductive dielectric material. The
main application is focused at replacing of the mechanical switch or button. The ASSP can
independently handle the 4 touch pads with 4 direct output pins.
FEATURES
ƒ Operating voltage 2.4V~5.5V
ƒ Built-in regulator with external enable/disable option
ƒ Operating current, @VDD=3V no load
At low power mode typical 2.5uA
At fast mode typical 9.0uA
ƒ @VDD=3V operating voltage :
The response time about 100mS at fast mode, 200mS at low power mode for TTP224
The response time about 60mS at fast mode, 160mS at low power mode for TTP224N
ƒ Sensitivity can adjust by the capacitance(0~50pF) outside for each touch pad
ƒ Provides Fast mode and Low Power mode selection by pad option(LPMB pin)
ƒ Provides direct mode or toggle modeCMOS output or open drain output
active high or active low by pad option(TOG/OD/AHLB pin).
ƒ Provides 2 output pins TPQ0D, TPQ2D that have no diode protection, active low
ƒ Have the maximum on time 120sec/64sec/16sec/infinite by pad option(MOT1, MOT0 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 Button key replacement
2009/8/25
Page 1 of 4
Ver :2.0




TONTEK

TTP224 Datasheet Preview

TTP224 Datasheet

4 KEY TOUCH PAD DETECTOR IC

No Preview Available !

Preliminary
BLOCK DIAGRAM
TP0
TP1
TP2
TP3
DIS13
LPMB
MOT0
MOT1
REGEN
Sensor oscillator
circuit
Timing counter &
function option
control circuit
System oscillator
circuit
VREG
Regulator
circuit
Sensor &
Reference
detecting circuit
Touch detecting
circuit
Key-on & timing
control
APPLICATION CIRCUIT
TCP224/TCP224N APPLICATION (enable internal regulator)
K0
Cs0
K1
Cs1
K2
Cs2
K3
Cs3
2 1 22 21 20 19
3 TP2
TPQ2 18
4 TP3
TPQ3 17
5 AHLB
SM 16
TCP224/TCP224N OD 15
REGEN 14
DIS13 13
VSS 12
6 7 8 9 10 11
104
C1
TTP224/TTP224N
TonTouchTM
Output
mode
&
driver
circuit
TPQ0
TPQ1
TPQ2
TPQ3
TPQ0D
TPQ2D
TOG
AHLB
OD
SM
2009/8/25
Page 2 of 4
Ver :2.0


Part Number TTP224
Description 4 KEY TOUCH PAD DETECTOR IC
Maker TONTEK
Total Page 4 Pages
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