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TCA8418

ACTIVE

18-bit 1.65- to 3.6-V 1MHz I2C/SMBus keypad scanner with interrupt, reset & 80 key support

Product details

Number of I/Os 18 Features 1-MHz maximum frequency, 80-input keypad scan, Debounce filter Supply voltage (min) (V) 1.65 Supply voltage (max) (V) 3.6 Addresses 1 Rating Catalog Frequency (max) (MHz) 1 Operating temperature range (°C) -40 to 85
Number of I/Os 18 Features 1-MHz maximum frequency, 80-input keypad scan, Debounce filter Supply voltage (min) (V) 1.65 Supply voltage (max) (V) 3.6 Addresses 1 Rating Catalog Frequency (max) (MHz) 1 Operating temperature range (°C) -40 to 85
WQFN (RTW) 24 16 mm² 4 x 4
  • 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)
  • 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)

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.

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.

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Technical documentation

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Type Title Date
* Data sheet TCA8418 I2C Controlled Keypad Scan IC With Integrated ESD Protection datasheet (Rev. G) PDF | HTML 25 Jun 2018
Application note Understanding Transient Drive Strength vs. DC Drive Strength in Level-Shifters (Rev. A) PDF | HTML 03 Jul 2024
Application note Understanding the I2C Bus PDF | HTML 30 Jun 2015
Application note Maximum Clock Frequency of I2C Bus Using Repeaters 15 May 2015
Application note I2C Bus Pull-Up Resistor Calculation PDF | HTML 13 Feb 2015
EVM User's guide TCA8418E Keypad Scan EVM User's Guide 23 Aug 2014

Design & development

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Evaluation board

TCA8418E-EVM — TCA8418E-EVM I2C Controlled Keypad Scan IC With Integrated ESD Protection Evaluation Module

The TCA8418E-EVM is an evaluation board designed to demonstrate the key scanning functionality of the TCA8418E keypad scan IC. The EVM comes with 9 buttons configured in a row/column matrix for easy testing. In addition, the 10x2 receptacle allows the customer to expand the functionality of the (...)

User guide: PDF
Not available on TI.com
GUI for evaluation module (EVM)

SCPC008 TCA8418EVMGUI

Supported products & hardware

Supported products & hardware

Products
I2C general-purpose I/Os (GPIOs)
TCA8418 18-bit 1.65- to 3.6-V 1MHz I2C/SMBus keypad scanner with interrupt, reset & 80 key support
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TINA-TI provides all the conventional DC, transient and frequency domain analysis of SPICE and much more. TINA has extensive post-processing capability that allows you to format results the way you want them. Virtual instruments allow you to select input waveforms and probe circuit nodes voltages (...)
User guide: PDF
Reference designs

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Design guide: PDF
Schematic: PDF
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WQFN (RTW) 24 Ultra Librarian

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