TTP229 is a touch chip designed using the capacitive induction principle.
The chip has built-in voltage stabilizing circuit for touch sensor. The stable touch effect can be applied to various applications. The human body touch panel can be connected by non-conductive insulating material. The main application is to replace mechanical switches or buttons. The chip can independently support 8 touch keys or 16 touch keys.

2-line serial mode can choose active high level or active low level
Provides option selection multi-key or single-key valid function
Provide two sampling rates, the sampling rate in sleep mode is 8Hz, and the fast sampling rate is 64Hz
The maximum output time with Option to select valid keys is about 80 seconds
Sensitivity can be adjusted by external capacitance (1 ~ 50pF)
It takes 0.5 seconds to stabilize after power-on. Do not touch the button panel during this period. All function touches are also invalid.
Automatic calibration: When all keys are not touched within a period of time, the chip system recalibration time is about 4.0 seconds