Texas Instruments TCA8418E User Manual
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Texas Instruments TCA8418E User Manual

Texas Instruments TCA8418E User Manual

Keypad scan evm
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This user's guide describes the TCA8418E-EVM keypad scan evaluation module (EVM). This guide
contains an introduction, setup instructions, the EVM schematic, top and bottom board layouts, and a bill
of materials (BOM).
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SLVUAA2 - August 2014
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Copyright © 2014, Texas Instruments Incorporated
TCA8418E Keypad Scan EVM
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  • Page 1: Table Of Contents

    SLVUAA2 – August 2014 TCA8418E Keypad Scan EVM This user’s guide describes the TCA8418E-EVM keypad scan evaluation module (EVM). This guide contains an introduction, setup instructions, the EVM schematic, top and bottom board layouts, and a bill of materials (BOM).

  • Page 2: Contents 1 Information About Cautions And Warnings

    When paired with the LaunchPad, The TCA8418E-EVM GUI can be used to read from or write to internal registers of the TCA8418E keypad scan IC, allowing the user to control the states of the I/O pins as well as see key presses in real-time.

  • Page 3: Tca8418E-Evm

    Introduction www.ti.com Table 1. Device and Package Configurations Keypad Scan IC Package TCA8418EYFFR DSBGA-32 Figure 1. TCA8418E-EVM SLVUAA2 – August 2014 TCA8418E Keypad Scan EVM Submit Documentation Feedback Copyright © 2014, Texas Instruments Incorporated...

  • Page 4: Setup

    Test point J4 is a test point for the RESET input, INT output, and CAD_INT output. 5.1.6 J5: Keypad Extension Header Header J5 allows extension of the functionality of the TCA8418E-EVM onto a larger keypad or GPIO expander board. COL9...

  • Page 5: Launchpad Hardware/Firmware Setup

    LaunchPad Hardware/Firmware Setup If using the TCA8418E-EVM GUI, the MSP430 LaunchPad board needs to be configured properly in order to flash the processor with the TCA8418E-EVM firmware. Implement the following steps before using the TCA8418E-EVM in conjunction with the LaunchPad: 1.

  • Page 6: Proper Orientation For The Tca8418E-Evm On The Launchpad

    Setup www.ti.com 2. Place the TCA8418E-EVM on top of the LaunchPad so that all connectors on J1 and J2 of the LaunchPad are inserted into J1 and J2 of the TCA8418E-EVM and J7 on the TCA8418E-EVM is on the same side as the mini-USB connector of the LaunchPad.

  • Page 7: Updating Driver Software In Device Manager

    11. Click Next. Click Close after you see the following: Figure 8. Successful Installation of the MSP430 LaunchPad Drivers 12. Flash the MSP430 by double-clicking TCA8418E_Flasher.bat in the TCA8418E-EVM LaunchPad Files folder where you extracted [SLVC601].zip. Figure 9. Flashing the MSP430 SLVUAA2 –...

  • Page 8: Successfully Flashed Msp430

    Figure 10. Successfully Flashed MSP430 14. Press any key to continue. TCA8418E Keypad Scan EVM SLVUAA2 – August 2014 Submit Documentation Feedback Copyright © 2014, Texas Instruments Incorporated...

  • Page 9: Gui Software Setup

    Start menu in Programs → Texas Instruments, Inc → TCA8418E.exe. Figure 11. Installing the TCA8418E-EVM GUI 2. If the GUI does not launch automatically, run the installed TCA8418E-EVM GUI program from the Start menu. 3. The GUI looks like the following image when it is opened and the LaunchPad is connected: Figure 12.

  • Page 10: Default Register Settings In The Tca8418E When Using The Launchpad

    Setup www.ti.com Default Register Settings in the TCA8418E when Using the LaunchPad Upon startup, the MSP430 LaunchPad configures the TCA8418E to work as a keypad scanner with the following values: Table 2. Default TCA8418E Register Values When Using the LaunchPad...

  • Page 11: Getting Started Using The Tca8418E-Evm

    TCA8418E-EVM is recommended. 3. Use the built-in 3x3 keypad on the TCA8418E-EVM or use J5 to attach an external keypad. If attaching an external keypad, the KP_GPIO registers (0x1D, 0x1E, and 0x1F) should be configured to accommodate the additional keys.

  • Page 12: Key Press Matrix Display While Holding Down The Middle Button (Sw12)

    The Read registers 1-4 every second checkbox causes the TCA8418E-EVM GUI to start a timer that will read registers 1 through 4 every second. The read takes 100 ms. This feature shows how KEY_EVENT_A and KEY_LCK_EC change every time the registers are read.

  • Page 13: Reading Register 0X0E

    Setup www.ti.com 5.5.2.3 Reading and Writing Registers All registers in the TCA8418E can be read using the TCA8418E-EVM GUI. Figure 16 shows how to read register 0x0E: Figure 16. Reading Register 0x0E Click the Read Register button and the following appears in the activity log text...

  • Page 14: Schematic

    Assembly Variant: Variant name not interpreted Sheet: warrant that this design will meet the specifications, will be suitable for your application or fit for any particular purpose, or will operate in an implementation. Texas Instruments and/or its Drawn By: File: HVL049A.SchDoc...

  • Page 15: Board Layout

    Board Layout www.ti.com Board Layout Figure 21. PCB Layer 1 (Top Layer) SLVUAA2 – August 2014 TCA8418E Keypad Scan EVM Submit Documentation Feedback Copyright © 2014, Texas Instruments Incorporated...

  • Page 16: Pcb Layer 2 (Gnd)

    Board Layout www.ti.com Figure 22. PCB Layer 2 (GND) TCA8418E Keypad Scan EVM SLVUAA2 – August 2014 Submit Documentation Feedback Copyright © 2014, Texas Instruments Incorporated...

  • Page 17: Pcb Layer 3 (Vcc)

    Board Layout www.ti.com Figure 23. PCB Layer 3 (VCC) SLVUAA2 – August 2014 TCA8418E Keypad Scan EVM Submit Documentation Feedback Copyright © 2014, Texas Instruments Incorporated...

  • Page 18: Pcb Layer 4 (Bottom Layer)

    Board Layout www.ti.com Figure 24. PCB Layer 4 (Bottom Layer) TCA8418E Keypad Scan EVM SLVUAA2 – August 2014 Submit Documentation Feedback Copyright © 2014, Texas Instruments Incorporated...

  • Page 19: Bill Of Materials

    TP1, TP2, TP3 Header, 100mil, 1pos, Gold, TH Testpoint TSW-101-07-G-S Samtec I2C CONTROLLED KEYPAD SCAN YFP0025ABAB TCA8418EYFPR Texas Instruments IC WITH INTEGRATED ESD PROTECTION, YFP0025ABAB SLVUAA2 – August 2014 TCA8418E Keypad Scan EVM Submit Documentation Feedback Copyright © 2014, Texas Instruments Incorporated...
  • Page 20 ADDITIONAL TERMS AND CONDITIONS, WARNINGS, RESTRICTIONS, AND DISCLAIMERS FOR EVALUATION MODULES Texas Instruments Incorporated (TI) markets, sells, and loans all evaluation boards, kits, and/or modules (EVMs) pursuant to, and user expressly acknowledges, represents, and agrees, and takes sole responsibility and risk with respect to, the following: 1.
  • Page 21 RADIO FREQUENCY REGULATORY COMPLIANCE INFORMATION FOR EVALUATION MODULES Texas Instruments Incorporated (TI) evaluation boards, kits, and/or modules (EVMs) and/or accompanying hardware that is marketed, sold, or loaned to users may or may not be subject to radio frequency regulations in specific countries.
  • Page 22 Les types d'antenne non inclus dans cette liste, ou dont le gain est supérieur au gain maximal indiqué, sont strictement interdits pour l'exploitation de l'émetteur. Mailing Address: Texas Instruments, Post Office Box 655303, Dallas, Texas 75265 Copyright © 2014, Texas Instruments Incorporated spacer Important Notice for Users of EVMs Considered “Radio Frequency Products”...
  • Page 23 IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, enhancements, improvements and other changes to its semiconductor products and services per JESD46, latest issue, and to discontinue any product or service per JESD48, latest issue.
  • Page 24 Mouser Electronics Authorized Distributor Click to View Pricing, Inventory, Delivery & Lifecycle Information: Texas Instruments TCA8418E-EVM...

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