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 8 touch pads or up to 16 touch pads.
FEATURES
● Operating voltage：2.4V~5.5V
● Built-in regulator
● Stand-by current
At 3V, and sleep mode slow sampling rate 8Hz：
=> Typical 2.5uA for 16 input keys
=> Typical 2.0uA for 8 input keys
● Provides to set 8 direct keys or 16 direct keys by option
● Provides to set 8 separate outputs only for 8 direct input keys mode
● Has I2C-bus slave interface, both can use for 8 and 16 direct input keys mode
TTP229-LSF Slave Device Identifier and Address => [1010 111R]
● 8 separate outputs can select output driving types by option
(CMOS/OD/OC with active high/low)
● Offer multi-key or single-key feature by option
● Provides two kinds of sampling rate that slow sampling rate 8Hz
and fast sampling rate 64Hz at sleep mode
● Have the maximum key-on time about 80sec by pin option
● Sensitivity can adjust by the capacitance(1~50pF) outside
● After power-on have about 0.5sec stable-time,
During the time do not touch the key pad, and all functions are disabled
● Auto calibration for environment changing
And the re-calibration period is about 4.0sec, when all keys are not activated for fixed time
APPLICATION
● Wide consumer products
● Button key replacement
