4 keys Touch Pad Detector IC

Outline

The TTP224B-BSBN/TTP224B-BSB 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

Characteristic

Operating voltage 2.4V ~ 5.5V

Built-in regulator for touch sensor

Operating current, @VDD=3V no load

At low power mode typical 2.5uA, At fast mode typical 13uA

@VDD=3V operating voltage :

The response time about 160mS at low power mode, 60mS at fast mode

Sensitivity can adjust by the capacitance（1~50pF）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)

Have the maximum on time 16sec/infinite by pad option(MOT0 pin)

Provides Single-key and Multi-key functions by pad option (SM 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

The re-calibration period is about 1 sec within 8 sec after power-on. When key has been

touched within 8 sec or key has not been touched more than 8 sec after power-on, then the

re-calibration period change to 4 sec

Applications

Wide consumer products

Button key replacement