Description：

The TCA8418 is a keypad scan device withintegrated ESD protection. It can operate from 1.65 Vto 3.6 V and has 18 general purpose inputs/outputs(GPIO) that can be used to support up to 80 keys viathe I2C interface.The key controller debounces inputs and maintains a10 byte FIFO of key-press and release events whichcan store up to 10 keys with overflow wrap capability.An interrupt (INT) output can be configured to alertkey presses and releases either as they occur, or atmaximum rate.

Features：

• Operating Power-Supply Voltage Range of 1.65-Vto 3.6-V

• Supports 80 Buttons With Use of 18 GPIOs

• Supports QWERTY Keypad Operation Plus GPIOExpansion

• Low Standby (Idle) Current Consumption: 3 μA

• Supports 1-MHz Fast Mode Plus I2C Bus

• 10 Byte FIFO to Store 10 Key Presses andReleases

• Open-Drain Active-Low Interrupt Output

• Integrated Debounce Time of 50 μs

• Schmitt-Trigger Action Allows Slow InputTransition and Better Switching Noise Immunity atthe SCL and SDA Inputs: Typical Vhys at 1.8 V is0.18 V

• Latch-Up Performance Exceeds 200 mA PerJESD 78, Class II

• ESD Protection Exceeds JESD 22 on all 18 GPIOPins and non GPIO pins– 2000-V Human Body Model (A114-A)– 1000-V Charged Device Model (C101)

Applications：

• Smart Phones

• Tablets

• HMI Panels

• GPS Devices

• MP3 Players

• Digital Cameras