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TCA8418E,pdf(Controlled Keypad
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The TCA8418E is a keypad scan device with integrated IEC level 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 [serial clock (SCL), serial data (SDA)].
The key controller includes an oscillator that debounces at 50 µs 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. Also, for the YFP package, a CAD_INT pin is included to indicate the detection of CTRL-ALT-DEL (i.e., 1, 11, 21) key press action.
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