Texas Instruments TCA8424 User Manual

User's Guide

SCDU004–March 2013

TCA8424 Evaluation Module

This document is the EVM user guide for the TCA8424. The device is a low-voltage keyboard scanner that can support up to 128 keys, with open drain outputs that can sink up to 12 mA of current for LEDs. The TCA8424 is fully HID over I2C™ compliant and is available with a pre-programmed keyboard map.

Contents

1 About this Manual ........................................................................................................... 2

2 Information about Cautions and Warnings .............................................................................. 2

3 FCC Warning ................................................................................................................ 2

4 Items Required for Operation ............................................................................................. 3

5 Introduction .................................................................................................................. 3

6 TCA8424 EVM Design Circuitry, Bill of Materials, and Connection Descriptions .................................. 4

6.1 TCA8424 EVM Schematic ........................................................................................ 4

6.2 Printed-Circuit Board (PCB) Layout ............................................................................. 5

6.3 Bill of Materials ..................................................................................................... 9

6.4 VCC and GND Connections .................................................................................... 11

6.5 MSP430 Launchpad Interface .................................................................................. 11

6.6 Breakout Pins ..................................................................................................... 12

6.7 LED Outputs ...................................................................................................... 13

7 Launchpad Software Setup .............................................................................................. 14

8 GUI Software Setup ....................................................................................................... 16

9 GUI Walkthrough Guide .................................................................................................. 17

10 Related Documentation ................................................................................................... 30

1 TCA8424 EVM Schematic................................................................................................. 4

2 Layer 1 Top Side: 50-Ω Signal Layer .................................................................................... 5

3 Layer 2 (Int1): Ground Plane.............................................................................................. 6

4 Layer 3 (Int2): 50-Ω Signal with Ground Fill............................................................................. 7

5 Layer 4 Bottom Layer ...................................................................................................... 8

6 VCC and GND Connections ............................................................................................. 11

7 MSP430 Launchpad Interface ........................................................................................... 11

8 Breakout Pins .............................................................................................................. 12

9 LED Outputs ............................................................................................................... 13

1 Bill of Materials.............................................................................................................. 9

2 Header Configurations for P1, P2, and P7............................................................................. 12

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List of Figures

List of Tables

About this Manual

1 About this Manual

This user’s guide describes the TCA8424 Evaluation Module (EVM). This guide contains the EVM schematics, bill of materials, and top and bottom board layouts.

2 Information about Cautions and Warnings

This section describes the jumpers and connectors on the EVM as well and how to properly connect, set up, and use the TPS22985EVM.

This EVM contains components that can potentially be damaged by electrostatic discharge. Always transport and store the EVM in its supplied ESD bag, when not in use. Handle using an antistatic wristband. Operate on an antistatic work surface. For more information on proper handling, see the Electrostatic Discharge (ESD) application note (SSYA008).

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CAUTION

The information in a caution or a warning is provided for your protection. Please read each caution and warning carefully.

3 FCC Warning

This equipment is intended for use in a laboratory test environment only. It generates, uses, and can radiate radio frequency energy and has not been tested for compliance with the limits of computing devices pursuant to subpart J of part 15 of FCC rules, which are designed to provide reasonable protection against radio frequency communications, in which case the user, at their own expense is required to take whatever measures necessary to correct this interference.

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4 Items Required for Operation

The following items are required to program a TCA8424:

• TCA8424 EVM with un-programmed TCA8424 in socket

• Single 3.3-V supply

• MSP-EXP430G2 Rev 1.5 Launchpad with MSP430G2553 installed

• USB to mini-USB cable

• PC with Code Composer Studio installed running supplied firmware

• PC with Application GUI installed The following items are required to evaluate at the system level:

• TCA8424 EVM with programmed TCA8424 in socket

• Breakout wires to connect to keyboard matrix rows and columns

• Keyboard matrix

• Host system with I2C plus INT connected to board

5 Introduction

The benefits of the TCA8424 over other microcontroller-based solutions are lower development costs, smaller package, and lower power consumption. The lower development costs are seen due to the TCA8424 requiring programming of only 512 Bytes of OTP versus a full code stack on a microcontroller. The TCA8424 is fully compliant with HID over I2C based systems with little to no host firmware development.

The TCA8424 can also be used in a non-Hid over I2C environment by developing host drivers that mimic the HID over I2C protocol to interpret the input reports. The EVM features a socket to allow easy programming of multiple units for testing. The code stack supplied with the EVM is designed to interface with the MSP430G2553 Launchpad to accomplish this. Once programmed, the EVM features breakout headers for the keyboard and I2C connections to test in customer systems.

Items Required for Operation

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TCA8424 EVM Design Circuitry, Bill of Materials, and Connection Descriptions

6 TCA8424 EVM Design Circuitry, Bill of Materials, and Connection Descriptions

6.1 TCA8424 EVM Schematic

Figure 1 shows the schematic for the EVM. The connections on the EVM are briefly explained in the

subsequent sections.

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Figure 1. TCA8424 EVM Schematic

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TCA8424 EVM Design Circuitry, Bill of Materials, and Connection Descriptions

6.2 Printed-Circuit Board (PCB) Layout

Figure 2 to Figure 5 show the PCB layouts for the TCA8424 EVM.

Figure 2. Layer 1 Top Side: 50-Ω Signal Layer

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TCA8424 EVM Design Circuitry, Bill of Materials, and Connection Descriptions

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Figure 3. Layer 2 (Int1): Ground Plane

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TCA8424 EVM Design Circuitry, Bill of Materials, and Connection Descriptions

Figure 4. Layer 3 (Int2): 50-Ω Signal with Ground Fill

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TCA8424 EVM Design Circuitry, Bill of Materials, and Connection Descriptions

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Figure 5. Layer 4 Bottom Layer

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TCA8424 EVM Design Circuitry, Bill of Materials, and Connection Descriptions

6.3 Bill of Materials

Table 1 is the bill of materials for this EVM.

Table 1. Bill of Materials

ITEM QTY MFG MFG PART# REF DES DESCRIPTION 1 4 PANASONIC LNJ308G8PRA LED1, LED2, LED3, LED4 LED,SMT,0603,PURE GREEN,2.03V 2 1 POMONA ELECTRONICS 2269-0 J1 DUAL INSULATED BANANA JACKS,

BLACK, 0.75LS

3 1 PANASONIC ECJ-1V41E105M C4, C5, C6, C7, C8, C9, C10, C11, CAPACITOR,SMT,0603,CERAMIC,1.0u

F,25V,20%,X5S

4 1 PANASONIC ECJ-1VB0J106M C12 CAPACITOR,SMT,0603,CERAMIC,10u

F,6.3V,20%,X5R

5 1 TAIYO YUDEN TMK107SD472JA C2 CAPACITOR,SMT,0603,CERAMIC,470

0pF,25V,5%,SD 6 1 VISHAY SPRAGUE 594D687X0010R2T C3 CAP,TAN,SMT,10V,20%, 680uF 7 1 PANASONIC EEFUD0K101R C1 CAP,SMT,ELE,100uf,8V,20% 8 1 DIODES INC B230-13-F CR2 DIODE,SCHOTTKY,SMT, DIODES,INC. 9 1 DIODES INC SD103CW-13-F CR1 SCHOTTKEY

DIODE,SMT,20V,400mW,SOD-123 10 1 SAMTEC TSW-104-07-G-D P2 HEADER,THU,8P,2X4,MALE,DUAL

ROW,100LS,100TL 11 1 SAMTEC TSW-108-07-G-D P1 HEADER,THU,16P,2X8,MALE,DUAL

ROW,100LS,100TL 12 2 FCI 66951-010LF P8, P9 HEADER,THU,10P,1X10,FEMALE,SIN

GLE ROW,100LS,200TL 13 6 SAMTEC TSW-101-07-G-S P3, P4, P5, P6, P10, P11 HEADER,THU,1P,MALE,SINGLE

ROW,100TL 14 5 TE Connectivity 9-146281-0-02 P12, P13, P14, P15, P16 15 1 TE Connectivity 9-146281-0-04 P17 16 1 *ENPLAS CORPORATION QFN-40B-0.5-01 DUT3 HTSOCKET,QFN,40P,35x29x16.7mm,

w 2.1hole 17 1 TI TPS77001DBV U2 1.2~5.5V,ULTRALOW-POWER 50mA

LOW-DROP LINE REGULATOR 18 1 TI TPS27081ADDCR U3 HIGH SIDE LOAD SWITCH WITH LVL

SHFT AND ADJ SLEW RATE 19 1 TI LM2700MTX-ADJ/NOPB U4 LM2700 600KHZ/1.25MHZ,2.5A,

STEPUP PWM DC/DC CONVERTER 20 1 BOURNS SDR0805-100ML L1 INDUCTOR,SMT,2P,POWER,10uH,20

%,RoHS 21 1 VISHAY CRCW060310K0FKEA R21 RESISTOR,SMT,0603,1%,1/10W,10.0K 22 3 VISHAY CRCW0603100KFKEA R10, R11, R12 RESISTOR,SMT,0603,1%,1/10W,100K 23 1 VISHAY CRCW06031K02FKEA R3 RESISTOR,SMT,0603,1%,1/10W,1.02K 24 1 VISHAY CRCW0603150KFKEA R9 RESISTOR,SMT,0603,1%,1/10W,150K 25 1 VISHAY CRCW0603169KFKEA R8 RESISTOR,SMT,0603,1%,1/10W,169K 26 1 VISHAY CRCW060320K0FKEA R15 RESISTOR,SMT,0603,1%,1/10W,20.0K 27 1 VISHAY CRCW06034K64FKEA R2 RESISTOR,SMT,0603,1%,1/10W,4.64K 28 4 PANASONIC ERJ-3GSYJ121 R4,R5, R6, R7 RESISTOR,SMT,0603,5%,1/10W,120

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Table 1. Bill of Materials (continued)

29 5 PANASONIC ERJ-3GSYJ122 R16,R17, R18, R19, R20 RESISTOR,SMT,0603,5%,1/10W,1.2K 30 0 BOURNS 3313J-1-204 R14 PlaceHolder, DO NOT INSTALL 32 0 PANASONIC ECJ-1V41E105M C13 PlaceHolder, DO NOT INSTALL 33 1 Texas Instruments TCA8424RHAR U1 TIdevice to be used in Socket 34 5 TE Connectivity 382811-8 N/A Jumpers to be installed over P12, P13,

P14, P15, P16

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6.4 VCC and GND Connections

Pin 1 of J1 is a power input to the board and Pin 2 is the GND connection for the board. There are also 4 other GND test points in the corners of the board.

The TCA8424 cannot be powered from the MSP430 Launchpad when programming and needs an external supply.

Figure 6. VCC and GND Connections

TCA8424 EVM Design Circuitry, Bill of Materials, and Connection Descriptions

6.5 MSP430 Launchpad Interface

Headers P8 and P9 allow the EVM to interface with the MSP430 Launchpad. If not programming a unit, jumpers P12, P13, P14, and P16 may be installed, header P15 should be removed. When programming a unit, an external power supply is needed and all headers except P16 should be installed.

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Figure 7. MSP430 Launchpad Interface

TCA8424 EVM Design Circuitry, Bill of Materials, and Connection Descriptions

6.6 Breakout Pins

The breakout headers P1 and P2 allow connection of an external keyboard matrix to the EVM. P17 is connected to the I2C lines of the TCA8424 allowing an external host to communicate to the TCA8424.

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Figure 8. Breakout Pins

Table 2. Header Configurations for P1, P2, and P7

P1 P2 P7

Row15 (pin 16) Row14 Col7 Col6 GND (pin 1) Row13 Row12 Col5 Col4 /INT Row11 Row10 Col3 Col2 SDA Row9 Row8 Col1 Col0 (pin 1) SCL Row7 Row6 Row5 Row4 Row3 Row2 Row1 Row0 (pin 1)

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6.7 LED Outputs

The TCA8424 features LED outputs that are set via the HID SET Report Command in the GUI, discussed in Section 9, part D.

• Board LED1 = TCA8424 LED0

• Board LED2 = TCA8424 LED1

• Board LED3 = TCA8424 LED2

• Board LED4 = TCA8424 LED3

TCA8424 EVM Design Circuitry, Bill of Materials, and Connection Descriptions

Figure 9. LED Outputs

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Launchpad Software Setup

7 Launchpad Software Setup

Use the following steps to set up the Launchpad software:

1. Download Code Composer Studio from the Texas Instruments link.

2. With the Launchpad unplugged, configure the headers on the Launchpad to match the yellow box in the image below:

• The right 3 headers are vertical and the left 2 are horizontal

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3. With the Launchpad still unplugged, remove the right-most jumper on the J5 header to match the yellow box below:

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4. Connect the Launchpad to your computer with a USB to mini cable. A green LED and a red LED

5. Open Code Composer Studio and create a new workspace. Select the “Project” drop down menu and

6. After completing steps 1–5, to load the code at any point for any reason, simply open the workspace

If the Launchpad is running and VCC is not connected, the I2C communication will fail. You must pause the debugger, reset the MSP430 with the "reset CPU" button and then press “play” again.

Launchpad Software Setup

should be on as shown below:

click on “Import existing CCS/CCE Eclipse Project.” Select Browse on the “Select-search directory” option and select the location where the source code is stored. Click "Finish" and then select “debug launch” to load the code to the MSP430G2553 microcontroller. Once completed, disconnect the USB cable from the LaunchPad.

that was created. Ensure that the source code is the active project and the LaunchPad is connected through USB. Then select “debug launch” to load the code.

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GUI Software Setup

8 GUI Software Setup

1. Extract the “TCA8424 GUI.zip” contents to the destination folder of your choice.

2. Double click the setup.exe folder that was extracted in step 1.

3. The following window pops up. Click “Install”.

4. After finishing the installation, the GUI opens and looks like this:

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5. To open the GUI in the future, simply double click on the “TCA8424 G.application” file that was unzipped in step 1.

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9 GUI Walkthrough Guide

A. Connecting the Launchpad to the EVM and PC

1. Install all headers except P16, place an un-programmed TCA8424 in the socket, and power the EVM board with 3.3 V.

2. Connect the MSP430 Launchpad to the EVM as shown below:

• The connection point is under the board and the USB connector should open towards J1.

3. Connect the Launchpad to your PC.

B. Initiating the connection from the GUI to the Launchpad

1. Open up the device manager on your PC and find which of the COM ports is associated with the Launchpad.

• COM15 is the COM port associated with Launchpad as shown in the below image (using a local

installation for illustration purposes only):

GUI Walkthrough Guide

2. Open the GUI.

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GUI Walkthrough Guide

3. Under the "Select Port", there is a drop down menu box which is blank on startup, by default, as

shown below:

4. Click this box, and a list of COM ports will pop up. Select the COM port that is associated with the Launchpad which was identified in step 1.

• COM 15 from a local installation is shown for illustration purposes:

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5. Now the GUI has opened a connection to the Launchpad and the COM port remains in the drop down

GUI Walkthrough Guide

menu box as shown below:

After the connection the Launchpad has been established and the GUI can be fully utilized. The remaining sections give basic steps on how to use each of the GUI buttons and inputs.

C. Changing the I2C Address

The I2C address in this GUI is referenced with the Read and Write bit included. An address of 0xA8 is represented in binary as 1010100Xb with the last bit being a 'don’t care'. Address 0xA8 and 0xA9 are both interpreted as the same address.

The GUI indicates whether an I2C Nack is received by the Launchpad, by presenting a dialog box like shown below:

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GUI Walkthrough Guide

1. Both the Launchpad and GUI default the I2C addresses to 0x76 on startup as shown below:

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2. The I2C address must be written into the text box in the default format. Once an address has been entered, simply click on the “Change I2C address” button to communicate this to the Launchpad.

• If the Launchpad is restarted, the I2C address will default again to 0x76 and must be changed

again if you are working with a different I2C address.

3. Since the default address of the TCA8424 is 0x76 when the OTP is not programmed, leave the default address in the Launchpad.

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D. HID commands and Read Report

1. The LED outputs can be changed using the HID Command “SET Report” in the GUI which replicates

GUI Walkthrough Guide

an HID host issuing the command. The LED values are off, by default, and are changed by clicking the LED buttons.

2. The LED inputs for the SET Report command change to read ‘1’ with a green background when clicked, and change back to ‘0’ with a red background when clicked again.

3. After inputting the LED values to be set, click the “SET Report button to set the output report and the LED’s turn on.

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GUI Walkthrough Guide

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4. Clicking the “Set Power Sleep” issues the SET POWER = WAKE HID Command and puts the device to sleep. If the LED outputs are turned on when this command is issued, they will now turn off.

5. Issuing the SET POWER = WAKE command turns the LED’s back on after a Sleep command has been issued. This is done by clicking the “Set Power Wake” command

6. The “Reset” button issues the RESET HID Command and the device resets, this clears the output report. If LED’s were on previously, then they will turn off after this command is received.

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7. The “Get Report” button issues the HID command GET REPORT. This retrieves the current contents

GUI Walkthrough Guide

of the input report and populates the text box below the button (red box). The GET REPORT command does not clear an interrupt.

For more information on how HID commands operate and the TCA8424’s device behavior, please see the “COMMAND and DATA REGISTER” section of the datasheet.

8. The “Read Report” button issues an unaddressed read command to the TCA8424. It populates the same text box as the “Get Report” button does with the contents of the input report, but it will clear an asserted interrupt.

For more information on the Input Report behavior please see the “INPUT REPORT” section of the datasheet.

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GUI Walkthrough Guide

E. Programming and verifying the OTP contents

1. The first thing that must be created is the .csv file that contains the OTP contents. If this has been created skip to step 2.

(a) Open an excel workbook with a single column for the OTP contents.

• The image below shows a properly formatted excel file with the blue box indicating a break in the 512 byte contents:

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(b) Click the "Office" button and then click “Save as”. (c) In the Save as window that pops up, choose the “CSV (Comma delimited) (*csv)” option under the

“Save as type” menu (indicated by red box):

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GUI Walkthrough Guide

(d) Click “Save” and click "OK" to the message that pops up:

(e) Click "Yes" to the next dialog box that opens:

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GUI Walkthrough Guide

(f) Exit the .csv file and click "Yes" to the two dialog boxes that show up as shown below:

2. Now that we have a .csv, the OTP contents can be programmed. Click the “Load OTP” button as shown below:

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3. This opens a Windows®Explorer window that shows only .csv files. Navigate to the .csv file created

GUI Walkthrough Guide

earlier:

4. This populates the text box above the “Load OTP” button with the contents of the .csv file. This text box is fully editable, as long as the contents remain in the same format.

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GUI Walkthrough Guide

5. Now choose a start location for our OTP programming and the number of bytes to program.

(a) The start location should be formatted as below and has no default contents. You must enter a

value before programming the OTP.

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(b) The number of bytes is defaulted to the value “512” and should be entered as a decimal value in

the text box, if it needs to be changed.

6. Now that the start location, number of bytes, and the OTP contents are in place, we are ready to program the OTP. Upon completion, the following dialog box should appear:

7. The first byte of the OTP (Address 0x0000) contains the I2C address for the device including the R/W bit. The R/W bit of the I2C address must be programmed to a ‘1’ for the OTP contents to be

used. If a ‘0’ is programmed at this bit, the OTP will program but the contents will not load into the digital core.

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8. Because we have now programmed a new I2C address into the device, we must change the I2C

GUI Walkthrough Guide

address in the Launchpad with the Change I2C address button.

• In this case it will now be 0x91 as shown below:

9. Now that the OTP contents are changed and the I2C address in the Launchpad is set, confirm that what was actually programmed, matches what we tried to program.

(a) Click on the “Read OTP” button to read back the OTP contents in the device and populate the

textbox above the “Read OTP” button as shown below:

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Related Documentation

(b) Now compare the contents to be programmed with the current OTP contents by clicking the

“Compare OTP” button. If the "Contents to be Programmed" and the "Current OTP Contents" are the same, the dialog below the “Compare OTP” button changes accordingly, as shown below:

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The Compare OTP button assumes the "Contents to be Programmed" and "Current OTP Contents" are the same length. They must match exactly for dialog box to change to “Match”.

After Programming the OTP, the device will be in "TEST" mode until powered down and then powered up again. This causes increased ICC outside of datasheet specifications. Once power cycled, the device ICC returns to normal.

10 Related Documentation

TCA8424 Low-Voltage 8x16 Keyboard Scanner with HID over I2C Compliant Interface Datasheet

(SCDS341)

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