TTP229 touch button module

This project is used to verify the solution verification board design of the Lichuang Mall touch chip TTP229-BSF-16 (product number C82529).

Working voltage: 2.4V~5.5V

Provides press-option settings for 8 direct keys or 16 direct keys, and 8 independent outputs for 8 direct input key modes.

It has a 2-wire serial output interface, which can be used in 8-way and 16-way direct input key modes.

Two sampling rates are provided, 8Hz sampling rate in sleep mode and 64Hz fast sampling rate.

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

There is a stabilization time of about 0.5 seconds after powering on. Please do not touch the keyboard during this period. All functions are disabled. Automatically calibrate to environmental changes, and the recalibration period is about 4.0 seconds, at which time all keys are not activated for a fixed period of time.

Mode configuration (TP0-TP7) is implemented through the DIP switch. When the DIP switch is turned on, the bit is 0. During normal use (16-way fast), turn 1-5 to ON.

The test program ttp229.c is a program for reading the key values ​​of the 16-button IIC.