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TCA8418 - I2C Controlled Keypad Scanner

General 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.

Key Features

  • 1 Operating Power-Supply Voltage Range of 1.65-V to 3.6-V.
  • Supports 80 Buttons With Use of 18 GPIOs.
  • Supports QWERTY Keypad Operation Plus GPIO Expansion.
  • Low Standby (Idle) Current Consumption: 3 μA.
  • Supports 1-MHz Fast Mode Plus I2C Bus.
  • 10 Byte FIFO to Store 10 Key Presses and Releases.
  • Open-Drain Active-Low Interrupt Output.
  • Integrated Debounce Time of 50 μs.
  • Schmitt-Trigger Action Allows Slow Input Transition a.

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Full PDF Text Transcription (Reference)

The following content is an automatically extracted verbatim text from the original manufacturer datasheet and is provided for reference purposes only.

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Product Folder Order Now Technical Documents Tools & Software Support & Community TCA8418 SCPS215G – SEPTEMBER 2009 – REVISED JUNE 2018 TCA8418 I2C Controlled Keypad Scan IC With Integrated ESD Protection 1 Features •1 Operating Power-Supply Voltage Range of 1.65-V to 3.6-V • Supports 80 Buttons With Use of 18 GPIOs • Supports QWERTY Keypad Operation Plus GPIO Expansion • Low Standby (Idle) Current Consumption: 3 μA • Supports 1-MHz Fast Mode Plus I2C Bus • 10 Byte FIFO to Store 10 Key Presses and Releases • Open-Drain Active-Low Interrupt Output • Integrated 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.