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Product details

Parameters

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) (kHz) 1000 Operating temperature range (C) -40 to 85 open-in-new Find other I2C general-purpose I/Os (GPIOs)

Package | Pins | Size

DSBGA (YFP) 25 0 mm² 2 x 2 open-in-new Find other I2C general-purpose I/Os (GPIOs)

Features

  • 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
    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
  • Very Small Package
    • WCSP (YFP): 2 mm × 2 mm; 0.4 mm pitch
  • APPLICATIONS
    • Smart Phones
    • Tablets
    • HMI Panels
    • GPS Devices
    • MP3 Players
    • Digital Cameras

All other trademarks are the property of their respective owners

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Description

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.

open-in-new Find other I2C general-purpose I/Os (GPIOs)
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Technical documentation

= Top documentation for this product selected by TI
No results found. Please clear your search and try again. View all 6
Type Title Date
* Datasheet TCA8418E I2C Controlled Keypad Scan IC With Integrated ESD Protection datasheet (Rev. C) Oct. 28, 2015
Selection guides I2C Infographic Flyer Dec. 03, 2015
Application notes Understanding the I2C Bus Jun. 30, 2015
Application notes Maximum Clock Frequency of I2C Bus Using Repeaters May 15, 2015
Application notes I2C Bus Pull-Up Resistor Calculation Feb. 13, 2015
User guides TCA8418E Keypad Scan EVM User's Guide Aug. 23, 2014

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Hardware development

EVALUATION BOARDS Download
document-generic User guide
75
Description

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 (...)

Features
  • Provides a keypad to demonstrate the key scanning function of the TCA8418E
  • Provides a port that allows the customer to connect all row and column pins to a custom keypad or board
  • Connectivity with the MSP430-G2 allows the customer to use the GUI interface for easy register access and control.
GUIS FOR EVALUATION MODULES (EVM) Download
SLVC601.ZIP (1066 KB)

Design tools & simulation

SIMULATION TOOLS Download
PSpice® for TI design and simulation tool
PSPICE-FOR-TI — PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
Features
  • Leverages Cadence PSpice Technology
  • Preinstalled library with a suite of digital models to enable worst-case timing analysis
  • Dynamic updates ensure you have access to most current device models
  • Optimized for simulation speed without loss of accuracy
  • Supports simultaneous analysis of multiple products
  • (...)
SIMULATION TOOLS Download
SPICE-based analog simulation program
TINA-TI 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 (...)
document-generic User guide
DESIGN TOOLS Download
I2C designer tool
I2C-DESIGNER — Use the I2C Designer tool to quickly resolve conflicts in addressing, voltage level and frequency in I2C based designs. Enter master and slave inputs to automatically generate an I2C tree or easily build a custom solution. This tool will help designers save time and comply with the I2C standard with (...)
Features
  • GUI-based web application
  • Exportable designs
  • JSON file uploader
  • Bill of materials generator

CAD/CAE symbols

Package Pins Download
DSBGA (YFP) 25 View options

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