TTP229 Datasheet, PDF (1/19 Pages) Tontek Design Technology – 16 KEYS OR 8 KEYS TOUCH PAD DETECTOR IC

Preliminary
TTP229
TonTouch^TM
16 KEYS OR 8 KEYS TOUCH PAD DETECTOR IC
GENERAL DESCRIPTION
The TTP229 TonTouch^TM 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 8
touch pads or up to 16 touch pads.
FEATURES
ƒ Operating voltage：2.4V~5.5V for built-in regulator enable
2.0V~5.5V for built-in regulator disable
ƒ Built-in regulator with external enable/disable option
ƒ Stand-by current
At 3V, and sleep mode slow sampling rate 8Hz：
Internal regulator is enabled, the Stand-by current
=> Typical 2.5uA for 16 input keys
=> Typical 2.0uA for 8 input keys
Internal regulator is disabled, the Stand-by current
=> Typical 2.5uA for 16 input keys
=> Typical 2.0uA for 8 input keys
ƒ Provides to set 8 direct keys or 16 direct keys by option
ƒ Provides to set 8 separate outputs only for 8 direct input keys mode
ƒ Has two kinds of serial output interface, both can use for 8 and 16 direct input keys mode
Include 2-wires serial interface and I²C-bus slave interface, they are selected by option
ƒ 8 separate outputs can select output driving types by option
(CMOS/OD/OC with active high/low)
ƒ 2-wires serial interface can select active high or low by option
ƒ Offer multi-key or single-key feature by option
ƒ Provides two kinds of sampling rate that slow sampling rate 8Hz
and fast sampling rate 64Hz at sleep mode
ƒ Have the maximum key-on time about 80sec by pin option
ƒ Sensitivity can adjust by the capacitance(1~50pF) outside
ƒ After power-on have about 0.5sec stable-time,
During the time do not touch the key pad, and all functions are disabled
ƒ Auto calibration for environment changing
And the re-calibration period is about 4.0sec, when all keys are not activated for fixed time
APPLICATION
ƒ Wide consumer products
ƒ Button key replacement
09’/12/22
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