TTP224 Cảm Biến Điện Dung 4 Nút

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 mode、CMOS 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