TTP229 8/16 capacitive touch buttons, 8 button mode fixed IO output mode, 16 buttons need to use IIC communication, see schematic diagram and data sheet for details

Overview

TTP229 TonTouchTM IC is a touch chip designed using capacitive sensing principle. This chip has built-in voltage regulator circuit for

Touch sensor use, stable touch effect can be applied in various applications, human touch panel can pass non-conductive insulation.

Edge material connection, the main application is to replace mechanical switches or buttons, this chip can independently support 8 touch keys or 16 touch keys.

Features

? Working voltage: 2.4V~5.5V (enable built-in voltage regulator circuit)

2.0V~5.5V (disable built-in voltage regulator circuit)

? Externally selectable enable/disable built-in voltage regulator function

? stand-by current

3V voltage, in sleep mode with low sampling rate of 8Hz:

Enable Internal Regulator, Standby Current

=> Typical 2.5uA in 16-key mode

=> Typical 2.0uA in 8-key mode

Internal regulator disabled, standby current

=> Typical 2.5uA in 16-key mode

=> Typical 2.0uA in 8-key mode

? Provide Option to choose 8-key or 16-key mode.

? Provide 8 direct output independent ports, only in 8-key direct output mode

? With two serial output modes, can be applied in 8 and 16 key modes

Includes 2-wire serial mode and I

2

C communication mode, selected by option.

? 8 direct output ports can choose different output types (CMOS/OD/OC with high/low level active)

? 2-wire serial mode with option to select active high or active low

? Provide option to select multi-key or single-key effective function

? Provide two sampling rates, the sampling rate is 8Hz in sleep mode, and the fast sampling rate is 64Hz

? The maximum output time of a valid key with Option is about 80 seconds.

? Sensitivity can be adjusted by external capacitor (1~50pF)

? It takes 0.5 seconds to stabilize after power on

Do not touch the key panel during this period, and all functional touches are also invalid.

? Automatic calibration

When all keys are not touched for a period of time, the chip system recalibration time is about 4.0 seconds

TTP229 block diagram: