DESCRIPTION
●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 [serial clock (SCL), serial data (SDA)].
●FEATURES
●• Operating Power-Supply Voltage Range of 1.65 V to 3.6 V
●• Supports QWERTY Keypad Operation Plus GPIO Expansion
●• 18 GPIOs Can Be Configured into Eight Inputs and Ten Outputs to Support an 8 × 10 Keypad
●Array (80 Buttons)
●• ESD Protection Exceeds JESD 22 on all 18 GPIO Pins and non GPIO pins
●– 2000-V Human Body Model (A114-A)
●– 1000-V Charged Device Model (C101)
●• Low Standby (Idle) Current Consumption: 3 µA
●• Polling Current Drain 70 µA for One Key Pressed
●• 10 Byte FIFO to Store 10 Key Presses and Releases
●• Supports 1-MHz Fast Mode Plus I2C Bus
●• Open-Drain Active-Low Interrupt Output, Asserted when Key is Pressed and Key is Released
●• Minimum Debounce Time of 50 µs
●• Schmitt-Trigger Action Allows Slow Input Transition and Better Switching Noise
●Immunity at the SCL and SDA Inputs: Typical Vhys at 1.8 V is 0.18 V
●• Latch-Up Performance Exceeds 200 mA Per JESD 78, Class II
●• Very Small Packages
●– WCSP (YFP): 2 mm × 2 mm; 0.4 mm pitch
●– QFN (RTW): 4 mm × 4 mm; 0.5 mm pitch
