TTP224N Datasheet, PDF (1/10 Pages) Tontek Design Technology – 4 KEY TOUCH PAD DETECTOR IC

Preliminary
TTP224N
TonTouch^TM
4 KEY TOUCH PAD DETECTOR IC
GENERAL DESCRIPTION
The TTP224N TonTouch^TM 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
 Operating voltage 2.4V~5.5V
 Built-in regulator with external enable/disable option
 Operating current, @VDD=3V no load
At low power mode typical 2.5uA, At fast mode typical 9uA
 @VDD=3V operating voltage :
The response time about 60mS at fast mode, 160mS at low power mode
 Sensitivity can adjust by the capacitance(0~50pF) outside for each touch pad
 Provides Fast mode and Low Power mode selection by pad option(LPMB pin)
 Provides direct mode or toggle mode、CMOS output or open drain output、
active high or active low by pad option(TOG/OD/AHLB pin).
 Provides 2 output pins TPQ0D, TPQ2D that have no diode protection, active low
 Have the maximum on time 120sec/64sec/16sec/infinite by pad option(MOT1, MOT0 pin)
 After power-on have about 0.5sec stable-time, during the time do not touch the key pad,
and the function is disabled
 Auto calibration for life, and the re-calibration period is about 4.0sec, when key has not be
touched.
APPLICATION
 Wide consumer products
 Button key replacement
2014/06/05
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