TTP224B

TTP224B 4 keys Touch Pad Detector IC Outline z The TTP224B 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 z Operating voltage 2.4V ~ 5.5V z Built-in regulator with external enable/disable option (REGEN pin) z Operating current, @VDD=3V no load At low power mode typical 2.5uA, At fast mode typical 13uA z @VDD=3V operating voltage : The response time about 160mS at low power mode, 60mS at fast mode z Sensitivity can adjust by the capacitance（1~50pF）outside for each touch pad z Provides Fast mode and Low Power mode selection by pad option (LPMB pin) z Provides direct mode or toggle mode、CMOS output or open drain output、 active high or active low by pad option (TOG/OD/AHLB pin) z Have the maximum on time 120sec/64sec/16sec/infinite by pad option(MOT1, MOT0 pin) z Provides Single-key and Multi-key functions by pad option (SM pin) z After power-on have about 0.5sec stable-time, during the time do not touch the key pad, and the function is disabled z Auto calibration for life z 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 b...