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HSW- TTP224B-BSBN
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
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