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User's Guide

SBOU076 – September 2008

Serial-Bus Evaluation Module

This user’s guide describes the characteristics, operation, and the use of the Serial-Bus-EVM evaluation

module. It provides a detailed description of the hardware configuration. The Serial-Bus-EVM is a

general-purpose tool used to generate I

C™, SPI™, and general-purpose digital input/output (I/O) data.

The EVM contains a solderless breadboard for prototyping circuits. A common typical application for this

tool is to communicate with temperature sensors over an I

C or SPI connection.

Contents

1 Overview ...................................................................................................................... 2

2 System Setup ................................................................................................................ 4

3 Serial-Bus-EVM Hardware Setup .......................................................................................... 4

4 Script Editor Software Overview.......................................................................................... 13

5 Bill of Materials ............................................................................................................. 15

List of Figures

1 Hardware Included with the Serial-Bus-EVM ............................................................................ 3

2 USB DIG Platform Hardware Setup ....................................................................................... 4

3 Connecting the Two EVM PCBs ........................................................................................... 5

4 Connecting Power to the EVM ............................................................................................. 6

5 Connecting the USB Cable ................................................................................................. 7

6 Interface Test Board Signal Connections ................................................................................. 8

7 Interface Test Board Banana Jack and Terminal Strip Connections ................................................. 9

8 Interface Test Board Test Points and Ground Connection ........................................................... 10

9 Unshielded Cable and Associated Problems ........................................................................... 11

10 Cable Design with Shield (Eliminates Capacitive Coupling Between Cables) ..................................... 12

11 Shielded Cable Build on Solder Cup D-Sub ............................................................................ 12

12 tioScript Editor Software Access—Properly Installed .................................................................. 13

13 tioScript Editor Window .................................................................................................... 14

Microsoft, Windows are registered trademarks of Microsoft Corporation.

SPI is a trademark of Motorola, Inc.

C is a trademark of NXP Semiconductors.

All other trademarks are the property of their respective owners.

SBOU076 – September 2008 Serial-Bus Evaluation Module 1

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Summary of content (17 pages)

PAGE 1
User's Guide SBOU076 – September 2008 Serial-Bus Evaluation Module This user’s guide describes the characteristics, operation, and the use of the Serial-Bus-EVM evaluation module. It provides a detailed description of the hardware configuration. The Serial-Bus-EVM is a general-purpose tool used to generate I2C™, SPI™, and general-purpose digital input/output (I/O) data. The EVM contains a solderless breadboard for prototyping circuits.
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Overview 1 www.ti.com Overview The Serial-Bus-EVM is a data acquisition system that allows you to both prototype and communicate with simple digital and mixed-signal circuits. The EVM consists of two primary components: the USB DIG Platform and the Interface Test Board. The USB DIG Platform interfaces with a connected PC and generates the I2C, SPI, and general-purpose digital I/O data. This document gives a brief overview of the USB DIG Platform.
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Overview www.ti.com Figure 1.
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System Setup 1.3 www.ti.com If You Need Assistance If you have questions about the Serial-Bus-EVM, send an e-mail to the Linear Applications Team at precisionamps@list.ti.com. Include Serial-Bus-EVM as the subject heading. 1.4 Information About Cautions and Warnings This document contains caution statements. CAUTION This is an example of a caution statement. A caution statement describes a situation that could potentially damage your software or equipment.
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Serial-Bus-EVM Hardware Setup www.ti.com 3.1 Electrostatic Discharge Warning Many of the components on the Serial-Bus-EVM are susceptible to damage by electrostatic discharge (ESD). Customers are advised to observe proper ESD handling precautions when unpacking and handling the EVM, including the use of a grounded wrist strap at an approved ESD workstation. CAUTION Failure to observe ESD handling procedures may result in damage to EVM components. 3.
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Serial-Bus-EVM Hardware Setup 3.3 www.ti.com Connecting Power After the two parts of the Serial-Bus-EVM are connected, as shown in Figure 4, connect the power to the EVM. Always connect power before connecting the USB cable. If you connect the USB cable before connecting the power, the computer will attempt to communicate with an unpowered device that will not be able to respond. Figure 4.
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Serial-Bus-EVM Hardware Setup www.ti.com 3.4 Connecting the USB Cable to the Serial-Bus-EVM Figure 5 shows the typical response to connecting the USB DIG platform to a PC USB port for the first time. Note that the EVM must be powered on before connecting the USB cable. Typically, the computer will respond with a Found New Hardware, USB Device pop-up. The pop-up typically changes to Found New Hardware, USB Human Interface Device. This pop-up indicates that the device is ready to be used.
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Serial-Bus-EVM Hardware Setup 3.5 www.ti.com Prototyping a Circuit—Using the Interface Test Board Connections to the signals from the USB DIG Platform are made in the pin socket area. There are 50 signals (2 x 25 pin connectors) in the pin socket area. The signals are connected from the pin sockets to the device under test using 22-gauge solid wire, as shown in Figure 6. Figure 6.
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Serial-Bus-EVM Hardware Setup www.ti.com Banana jacks and terminal strips can be used to connect external equipment to the circuit under test. The pin sockets allow you to wire the circuit under test to the banana jacks and terminal strips, as Figure 7 illustrates. Figure 7.
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Serial-Bus-EVM Hardware Setup www.ti.com Test points allow for connection to key nodes in the circuit. Figure 8 shows how an oscilloscope is connected to the circuit under test. The pin sockets allow you to wire the circuit under test to the test points. Also note the ground pad and ground test point. Figure 8.
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Serial-Bus-EVM Hardware Setup www.ti.com 3.6 Direct Connections from the USB DIG Platform In some cases, it may be more useful to connect signals directly from the USB DIG Platform to some custom hardware. This method typically uses a cable that connects to the D-SUB connector. It is recommended that you use shielded coaxial cable to directly connect I2C and SPI signals to the custom hardware. This direct connection eliminates capacitive coupling between the cables.
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Serial-Bus-EVM Hardware Setup www.ti.com 25-Pin Male D-Sub Solder Cup VDUT VDUT 10kW 10kW SCL (Pin 14) VDUT Shield SCL 2 I C Device SDA (Pin 13) Shield Shield to GND SDA GND (Pin 21) VDUT (Pin 17) GND VDUT Your Application Figure 10. Cable Design with Shield (Eliminates Capacitive Coupling Between Cables) Figure 11.
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Script Editor Software Overview www.ti.com 4 Script Editor Software Overview This section discusses how to install and use the Script Editor software. The tioScript Editor is a software program that allows you to enter a series of commands (script) to communicate with and evaluate a device under test. For example, a script can be written to communicate with an I2C temperature sensor. The Script Editor can be conceptualized as a programming environment.
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Script Editor Software Overview 4.3 www.ti.com Using the Script Editor Software Figure 13 shows the major features of the Script Editor. A more detailed description is given in the tioScript Editor User Guide. The Serial-Bus-EVM/USB DIG EVM Quick-Start Video (SBOU075) also gives a detailed description, including examples. Figure 13.
PAGE 15
Bill of Materials www.ti.com 5 Bill of Materials Table 1 shows the parts list for the Test Interface Board. Table 1. Test Interface Board Parts List No.
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EVALUATION BOARD/KIT IMPORTANT NOTICE Texas Instruments (TI) provides the enclosed product(s) under the following conditions: This evaluation board/kit is intended for use for ENGINEERING DEVELOPMENT, DEMONSTRATION, OR EVALUATION PURPOSES ONLY and is not considered by TI to be a finished end-product fit for general consumer use. Persons handling the product(s) must have electronics training and observe good engineering practice standards.
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IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, modifications, enhancements, improvements, and other changes to its products and services at any time and to discontinue any product or service without notice. Customers should obtain the latest relevant information before placing orders and should verify that such information is current and complete.