The TCA8418 is a keypad scan device with integrated ESD protection. It can operate from
1.65 V to 3.6 V and has 18 general purpose inputs/outputs (GPIO) that can be used to support up to
80 keys via the I2C interface.
The key controller debounces inputs and maintains a 10 byte FIFO of key-press and release
events which can store up to 10 keys with overflow wrap capability. An interrupt
(INT) output can be configured to alert key presses and releases either as
they occur, or at maximum rate.
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