TTP224B ic equivalent, 4 keys touch pad detector ic.
1 0 Direct mode, CMOS output active high
1 1 Direct mode, CMOS output active low
0 0 Direct mode, Open drain output active high
0 1 Direct mode, Open drain output act.
z Wide consumer products z Button key replacement
15/06/16
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Version：1.1
Block diagram
TTP224B
TP0 TP1 .
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