TCA8418E I2C Controlled Keypad Scan IC With Integrated ESD Protection |


I2C Controlled Keypad Scan IC With Integrated ESD Protection



The TCA8418E 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 TCA8418E saves power and bandwidths since it handles the keypad scanning algorithms. The TCA8418E is also ideal for usage with processors that have limited GPIOs.

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. A CAD_INT pin is included to indicate the detection of CTRL-ALT-DEL (essentially, 1, 11, 21) key press action.


  • Operating Power-Supply Voltage Range of 1.65-V
    to 3.6-V
  • ±15-kV Human Body Model High Voltage ESD
    (GPIO lines)
  • Supports 80 Buttons With Use of 18 GPIOs
  • Supports QWERTY Keypad Operation Plus GPIO
  • Low Standby (Idle) Current Consumption: 3 µA
  • Supports 1-MHz Fast Mode Plus I2C Bus
  • 10-Byte FIFO to Store 10 Key Presses and
  • 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
  • Very Small Package
    • WCSP (YFP): 2 mm × 2 mm; 0.4 mm pitch
    • Smart Phones
    • Tablets
    • HMI Panels
    • GPS Devices
    • MP3 Players
    • Digital Cameras

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Parametrics Compare all products in I2C keypad controllers & LED drivers

Number of I/Os
Number of Inputs
VCC (Min) (V)
VCC (Max) (V)
Frequency (Max) (kHz)
Operating temperature range (C)
Package Group
TCA8418E TCA8418
18     18    
80     80    
1.65     1.65    
3.6     3.6    
1000     1000    
IO expander
Keypad scan    
IO expander
Keypad scan    
1     1    
Debounce filter     Debounce filter    
-40 to 85     -40 to 85    
DSBGA | 25     WQFN | 24