Texas Instruments TCA8418 I2C Manuale utente

TCA8418 I2C Controlled Keypad Scan IC

Evaluation Module

User's Guide

Literature Number: SCPU033

May 2010

2SCPU033–May 2010

Preface ....................................................................................................................................... 5

1 Introduction ........................................................................................................................ 7

1.1 List of Hardware Items for Operation ................................................................................. 7

1.2 List of Software Items for Operation .................................................................................. 7

1.3 Step-by-step Instructions for Operation and Troubleshooting ..................................................... 7

1.4 Hardware Uninstall Instructions ....................................................................................... 7

1.5 Software Uninstall Instructions ........................................................................................ 8

2 EVM Configuration and Description ....................................................................................... 8

2.1 EVM Options ............................................................................................................. 8

2.2 EEPROM (U1) and JMP10 ............................................................................................. 8

2.3 LED (D1) Indication of USB Attached ................................................................................ 8

2.4 Test Point Connectors (TP1 through TP5) ........................................................................... 8

2.5 Jumper Configuration (JMP1 through JMP6) ........................................................................ 9

2.6 Schematics ............................................................................................................. 12

2.7 Bill of Materials ......................................................................................................... 14

3 GUI Configuration and Description ...................................................................................... 16

3.1 GUI Installation ......................................................................................................... 16

3.2 GUI Functionality ....................................................................................................... 17

3.2.1 Keypad Mode ............................................................................................... 17

3.2.2 Overflow Mode ............................................................................................. 18

3.2.3 GPIO Mode ................................................................................................. 19

3.2.4 Registers and I2C........................................................................................... 20

4 Related Documentation from Texas Instruments ................................................................... 21

SCPU033–May 2010 Table of Contents

www.ti.com

List of Figures

1 Jumper Configuration: JMP1 and JMP2................................................................................ 10

2 Jumper Configuration: JMP3 and JMP4................................................................................ 10

3 Jumper Configuration: JMP5............................................................................................. 11

4 Jumper Configuration: JMP6, JMP7, JMP8, JMP9 ................................................................... 11

5 Schematics (1 of 2)........................................................................................................ 12

6 Schematics (2 of 2)........................................................................................................ 13

7 TCA8418 EVM GUI Files................................................................................................. 16

8 TCA8418 EVM Application Installation ................................................................................. 16

9 TCA8418 EVM GUI: Keypad Mode..................................................................................... 17

10 TCA8418 EVM GUI: Overflow Mode.................................................................................... 18

11 TCA8418 EVM GUI: GPIO Mode ....................................................................................... 19

12 TCA8418 EVM GUI: Registers and I2C................................................................................. 20

List of Tables

1 Test Point Descriptions..................................................................................................... 8

2 Jumper Descriptions........................................................................................................ 9

3 Bill of Materials............................................................................................................. 14

4List of Figures SCPU033–May 2010

Read This First

SCPU033–May 2010

Preface

About This Manual

This user guide describes the functions and operation of TCA8418 Evaluation Module (EVM), including

hardware design, graphical user interface (GUI), and EVM setup.

How to Use This Manual

This document contains the following chapters:

• Chapter 1 – Introduction and Quick Start

• Chapter 2 – EVM Configuration and Description

• Chapter 3 – GUI Configuration and Description

• Chapter 4 – Schematic and Layout

Information about Cautions and Warnings

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

warning carefully.

CAUTION

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

application report Electrostatic Discharge (ESD) (SSYA008)

CAUTION

By default, the I2C data and clock lines at TP3 and TP4 are pulled up internally

to TCA8418 supply voltage (1.8 V to 3.3 V) through jumper JMP7 configuration.

If external pullup resistors are used instead, make sure to pull up to 3.3 V only.

Operation from 5 V is not specified and may permanently damage this EVM.

All trademarks are the property of their respective owners.

SCPU033–May 2010 Preface

FCC Warning

www.ti.com

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 interference. Operation of this equipment in other environments may

cause interference with radio communications, in which case the user at his/her own expense will be

required to take whatever measures may be required to correct this interference.

6Preface SCPU033–May 2010

User's Guide

SCPU033–May 2010

TCA8418 I2C Controlled Keypad Scan IC Evaluation

Module

1 Introduction

The TCA8418 EVM is an evaluation module (EVM) for the Texas Instruments (TI) inter-integrated circuit

(I2C) controlled keypad scan IC. The TCA8418 keypad scan IC operates from supply voltage range of 1.65

V to 3.3 V. It offers high level of electrostatic discharge (ESD) protection and supports 1-MHz Fast Mode

Plus I2C bus. With 18 configurable GPIO pins, it can be configured to support 10x8 keypad array. This

operation frees the processor from scanning the keypad for presses and releases, thus saving power and

bandwidth of the system.

The TCA8418 EVM serves as an I2C interface adapter between a host PC (IBM compatible), the

TCA8418, and/or other I2C compatible devices externally connected to the EVM. The communication

between EVM and the host PC is via USB (through a standard type-A to type-B USB cable), while the

communication between the EVM, the TCA8418, and/or other slave devices is via I2C bus. The EVM

converts communication transactions between the USB and I2C.

1.1 List of Hardware Items for Operation

To operate the TCA8418 EVM, these items are required:

• The TCA8418 EVM

• Standard type-A to type-B USB cable

• IBM compatible PC with Microsoft Windows XP or later operating system installed

1.2 List of Software Items for Operation

In addition to the hardware items listed in Section 1.1, this software is required:

• Demo GUI Software (TCA8418.exe)

The software can be downloaded from the TI website at www.ti.com.

The EVM is recognized by a PC as a generic human interface device (HID), which is supported by the

built-in USB/HID drivers of the Windows XP or later operating system. Therefore, it is plug-and-play and

no proprietary USB driver is required.

1.3 Step-by-step Instructions for Operation and Troubleshooting

After downloading and installing the GUI demo software, follow these steps to operate the EVM:

1. Plug the USB cable into both the PC and the EVM and wait for the LED to illuminate.

Troubleshooting: If the LED does not illuminate after 30 seconds, make sure that the USB cable is

securely connected. If the connection is secure, try a different USB port. If a different USB port does

not solve the problem, try to reboot the computer. If rebooting the computer does not fix the problem,

try a different USB cable. If a different USB cable does not solve the problem, contact TI technical

support for help.

2. Run the TCA8418 EVM GUI software and follow the instructions for the GUI.

1.4 Hardware Uninstall Instructions

Unplug the EVM from the USB port to uninstall the hardware from the host PC.

SCPU033–May 2010 TCA8418 I2C Controlled Keypad Scan IC Evaluation Module

EVM Configuration and Description

www.ti.com

1.5 Software Uninstall Instructions

For Windows operating system, go to Control Panel > Add or Remove Programs to remove the TCA8418

GUI software.

2 EVM Configuration and Description

2.1 EVM Options

The hardware is based on a USB peripheral chip from TI (TUSB3210). The TUSB3210 has an 8052 core

with enhanced performance. The PCB is a simple two-layer top-side populated board (see the schematic

in Section 2.6). The major features of the hardware design are detailed in the following sections.

2.2 EEPROM (U1) and JMP10

The embedded firmware is stored in a 64-kbit EEPROM (see U1 in the schematic in Section 2.6). The

firmware is field programmable. Jumper JMP10 is normally closed and is used for firmware development

only. On power up, the TUSB3210 downloads the firmware image from the EEPROM to the internal static

RAM and starts firmware execution (first with USB enumeration) from there.

2.3 LED (D1) Indication of USB Attached

A white LED is mounted next to the TUSB3210 IC (U4) on the evaluation board. Every time the USB

interface adapter is attached to a PC via a USB cable, and if the host PC detects it and goes through USB

enumeration successfully, the embedded firmware illuminates the white LED (D1); otherwise, the LED

remains off. After unplugging the USB cable, the LED turns off immediately.

2.4 Test Point Connectors (TP1 through TP5)

Test point connectors TP1 through TP5 allow the users to connect both external signal sources and

external I2C slave devices to the EVM. Table 1 describes the functions of all of the test points in the EVM.

Table 1. Test Point Descriptions

Test Point Functionality Configuration

To either monitor or supply to To supply TCA8418 IC reset externally , the external I/O logic level must be the

TP1 TCA8418 IC reset signal same as TCA8418 IC.

To monitor TCA8418 IC

TP2 interrupt signal

To either monitor or supply to To supply TCA8418 IC SCL externally , the external I/O logic level must be the

TP3 TCA8418 IC I2C SCL line same as TCA8418 IC.

To either monitor or supply to To supply TCA8418 IC SDA externally , the external I/O logic level must be the

TP4 TCA8418 IC I2C SDA line same as TCA8418 IC.

To either monitor or supply to To supply TCA8418 IC VCC externally , U5 must be disabled by shunting 2-3 on

TP5 TCA8418 VCC JMP4.

TP6 Ground test point

TP7 Ground test point

TP8 Ground test point

8SCPU033–May 2010

TCA8418 I2C Controlled Keypad Scan IC Evaluation Module

www.ti.com

EVM Configuration and Description

External Microcontroller Control

The user can provide external microcontroller I2C and GPIO connections to the EVM by routing them to

test points TP1 to TP4.

Before connecting the microcontroller, check the following:

• Make sure the I/O voltage of the external microcontroller is the same as the I/O voltage of the

TCA8418. The power supply voltage of the TCA8418_VCC can be adjusted through JMP5 or

externally supplied through TP5 with U5 disabled by JMP4 (see Section 2.5).

• Make sure the external microcontroller is isolated from the TUSB3210 by disabling the TXS0104E level

translator. Shorting jumper JMP2 can disable the level translator (see Section 2.5).

External I2C Slave Devices

The user can connect external I2C slave devices to test points TP3 and TP4. The devices can be

controlled through the TCA8418 graphical user interface (GUI) software. Under the GUI software control,

the I2C bus operates at 400 kHz. Therefore, the external slave devices must support 400-kHz I2C bus.

2.5 Jumper Configuration (JMP1 through JMP6)

To use the full TCA8418 (GUI) software functionality, all jumpers except JMP5 must be at their default

settings. Table 2 describes all of the jumpers in the EVM and their respective functionality (all default

settings are in bold).

Table 2. Jumper Descriptions

Jumper Functionality Configuration

TCA8418 Keypad Scanner IC Open JMP1 to allow GUI control

JMP1 Disable Shunt JMP1 to disable TCA8418 manually

TXS0104E Level Translator Open JMP2 to enable level translation

JMP2 Disable Shunt JMP2 to disable level translation

LP2985-33 5V to 3.3V LDO Shunt JMP3 in 1-2 position to enable the 3.3V LDO

JMP3 Disable Shunt JMP3 in 2-3 position to disable the 3.3V LDO

TPS73101 5V to Variable Shunt JMP4 in 1-2 position to enable the Variable Output LDO

JMP4 Output LDO Disable Shunt JMP4 in 2-3 position to disable the Variable Output LDO

TPS73101 5V to Variable Shunt 1-2 for TCA8418_VCC = 1.8V

JMP5 Output LDO Adjust Shunt 2-3 for TCA8418_Vcc = 3.3VOpen all for TCA8418_Vcc = 2.4V

TCA8418 ROW6 Function Shunt 1-2 for GPI functionality

JMP6(1) Selection Shunt 2-3 for Keypad functionality

TCA8418 ROW7 Function Shunt 1-2 for GPI functionality

JMP7(1) Selection Shunt 2-3 for Keypad functionality

TCA8418 COL8 Function Shunt 1-2 for GPO functionality

JMP8(1) Selection Shunt 2-3 for Keypad functionality

TCA8418 COL9 Function Shunt 1-2 for GPO functionality

JMP9(1) Selection Shunt 2-3 for Keypad functionality

Open JMP6 to open EEPROM SCL line for firmware programming

JMP10 EEPROM SCL Line Short Shunt JMP4 to short EEPROM SCL line

(1) JMP6, JMP7, JMP8, and JMP9 must all have the same configuration for correct GUI operation.

SCPU033–May 2010 TCA8418 I2C Controlled Keypad Scan IC Evaluation Module

10 kW

TCA8418_VCC

JMP1

To TUSB3210 To TCA8418 Enable

TCA8418_VCC

JMP2

To TXS0104E Enable

10 kW

USB_5V

JMP3 and JMP4

To LDO Enable

Enable

Disable

EVM Configuration and Description

www.ti.com

Jumpers JMP1, JMP2, JMP3, and JMP4 allow the user to manually enable and disable TCA8418 (U3),

TXS0104E (U2), LP2988-33 (U7), and TPS73101 (U5), respectively. Jumpers JMP1 and JMP2 are

two-pin headers with pin 1 pulled up to TCA8418_VCC through 10-kΩresistors (see Figure 1). Jumpers

JMP3 and JMP4 are three-pin headers with two jumper configurations (see Figure 2).

Figure 1. Jumper Configuration: JMP1 and JMP2

To enable both the TCA8418 and the TXS0104E, leave both JMP1 and JMP2 open. Through the GUI

software, the TUSB3210 microcontroller (U4) detects the on/off state of the TCA8418 IC (U3). When

JMP1 is open, the TCA8418 EVM software has the full control of the TCA8418 IC through TUSB3210

microcontroller. To manually disable the TCA8418 IC, shunt JMP1 to drive the active-low reset input of the

TCA8418 to logic low.

JMP2 controls the TXS0104E level translator. The TCA8418 IC and other externally connected I2C slave

devices are on side A of the TXS0104E, while the TUSB3210 microcontroller is on side B of the

TXS0104E. Side A logic level is referred to the power supply level of the TCA8418, which ranges from

1.65 V to 3.6 V. As mentioned in Section 2.4, the TCA8418_VCC can be externally supplied through TP5

when TPS73101 (U5) is disabled through JMP4, or it can be supplied through the TPS73101 with output

voltages of 1.8 V, 2.3 V, or 3.3 V depending on JMP5 configuration. Side B logic level remains fixed to the

3.3-V power supply voltage of the TUSB3210.

Figure 2. Jumper Configuration: JMP3 and JMP4

If external sources of SCL, SDA, interrupt, and reset signals to the TCA8418 IC are used, disable the

TXS0104E and the TPS73101 ICs through JMP2 and JMP4 before connecting the external signals. JMP3

and JMP4 (see Figure 2) can enable or disable the output of the LP2985-33 or the TPS73101 LDO ICs.

To enable the LDOs, shunt pins 1 and 2 of the JMP3 and JMP4 to tie the enable pins of the LDO ICs to

USB_5V. To disable the LDOs, shunt pins 2 and 3 of the JMP3 and JMP4 to tie the enable pins to ground.

10 SCPU033–May 2010

TCA8418 I2C Controlled Keypad Scan IC Evaluation Module

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