The TTP239 TonTouchTM IC is capacitive sensing designspecifically for touch pad controls. The device built in regulator for touchsensor. Stable sensing method can cover persity conditions. Human interfacescontrol panel links through non-conductive dielectric material. The mainapplication is focused at replacing of the mechanical switch or button. TheASSP 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 externalenable/disable option (LVREN pin)

Operating current, @VDD=3V no load, LDO enable

At low power mode typical 5.0uA, At fast mode typical30uA

@VDD=3V operating voltage :

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

Sensitivity can adjust by the capacitance（1~50pF）outside for each touch pad

Provides Fast mode and Low Power mode selection by padoption (LPM pin)

Provides 8 direct outputs for 8 direct input keys. Andall 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 interfacethat can be selected by pad option (SLSERT pin)

Have the maximum on time 120sec/64sec/16sec/infiniteby pad option (MOT1, MOT0 pin)

Provides Single-key and Multi-key functions by padoption (SM pin)

2-wires serial interface can select active high or lowby pad option (SAHL pin)

After power-on have about 0.5sec stable-time, duringthe 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 secafter power-on. When key has been touched within 8 sec or key has not beentouched more than 8 sec after power-on, then the re-calibration period changeto 4 sec

Applications

Wide consumer products

Button key replacement