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Product details

Parameters

Number of I/Os 18 Features 1-MHz maximum frequency, 80-input keypad scan, Debounce filter VCC (Min) (V) 1.65 VCC (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

WQFN (RTW) 24 16 mm² 4 x 4 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
  • 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)

All trademarks are the property of their respective owners.

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

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.

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

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Type Title Date
* Datasheet TCA8418 I2C Controlled Keypad Scan IC With Integrated ESD Protection datasheet (Rev. G) Jun. 25, 2018
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
More literature I2C Overview [WMV] Feb. 11, 2010

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
$75.00
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
SCPC008.ZIP (827 KB)

Design tools & simulation

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

Reference designs

REFERENCE DESIGNS Download
Mobile Point of Sale (mPOS) Power Reference Design
TIDA-00818 — This mobile point of sale (mPOS) reference design features a 1S1P Li-Ion battery architecture to reduce system size and cost. Integrated load switches are used to reduce standby power consumption and maximize battery life to enable the single-cell architecture. A USB Type-C charging port is also (...)
document-generic Schematic document-generic User guide

CAD/CAE symbols

Package Pins Download
WQFN (RTW) 24 View options

Ordering & quality

Support & training

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Videos

What is the I2C Designer Tool?

This video provides an overview of the I2C designer tool. Watch this video to learn how to overcome common I2C headaches.

Posted: 17-Jan-2020
Duration: 04:32

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