I2C Controlled Keypad Scan IC With Integrated ESD Protection - TCA8418

TCA8418 (ACTIVE)

I2C Controlled Keypad Scan IC With Integrated ESD Protection

 

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.

The key controller debounces inputs 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.

Features

  • 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 0.18 V
  • Latch-Up Performance Exceeds 200 mA Per JESD 78, Class II
  • 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)

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Parametrics Compare all products in I2C Special Function

 
Number of Outputs
Operating Temperature Range (C)
Rating
Max Frequency (kHz)
Function
I2C Address
Pin/Package
Special Features
TCA8418 TCA8418E
18    18   
-40 to 85    -40 to 85   
Catalog    Catalog   
1000    1000   
Keypad Scan    Keypad Scan IC with ESD   
110100    110100   
24WQFN    25DSBGA   
Push-Pull I/O Type
On-Chip Power-on-Reset
Low Voltage   
Push-Pull I/O Type
On-Chip Power-on-Reset