The TTP239 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 8 touch pads with 8 direct output pins.
Characteristic
Operating voltage 2.4V ~ 5.5V
Built-in regulator with external enable/disable option
(REGEN pin)
Built-in low voltage reset(LVR) function with external
enable/disable option (LVREN pin)
Operating current, @VDD=3V no load, LDO enable
At low power mode typical 5.0uA, At fast mode typical
30uA
@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 (LPM pin)
Provides 8 direct outputs for 8 direct input keys. And
all can select active high or active low by pad option (SAHL pin)
Provides two kinds of serial output interface
Include 2-wires and I2C-bus slave serial interface
that can be selected by pad option (SLSERT pin)
Have the maximum on time 120sec/64sec/16sec/infinite
by pad option (MOT1, MOT0 pin)
Provides Single-key and Multi-key functions by pad
option (SM pin)
2-wires serial interface can select active high or low
by pad option (SAHL 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
