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
