4 KEY TOUCH PAD DETECTOR IC  TonTouchTM

Product：TTP224N

一、General Description 

The TTP224N 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.

二、 Features                                       

Operating voltage 2.4V~5.5V

Built-in regulator with external enable/disable option

Operating current, @VDD=3V no load

At low power mode typical 2.5uA, At fast mode typical 9uA

@VDD=3V operating voltage :

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

Sensitivity can adjust by the capacitance(0~50pF) 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).

Provides 2 output pins TPQ0D, TPQ2D that have no diode protection, active low

Have the maximum on time 120sec/64sec/16sec/infinite by pad option(MOT1, MOT0 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, and the re-calibration period is about 4.0sec, when key has not be

touched.

三、APPLICATION

Wide consumer products

Button key replacement

四、PAD DESCRIPTION 

Note：Pin Type

I ＝＞CMOS input only I-PH ＝＞CMOS input and pull-high resister

O ＝＞CMOS push-pull output I-PL ＝＞CMOS input and pull-low resister

I/O ＝＞CMOS I/O OD ＝＞Open drain output, have no Diode protective circuit

 P ＝＞Power / Ground

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