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
