Texas Instruments PGA308 User manual

PGA308EVM
User's Guide
Literature Number: SBOU060
July 2008

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Contents
Preface ............................................................................................................................... 5
1 Overview ................................................................................................................... 71.1 PGA308EVM Hardware ..................................................................................................... 8
2 System Setup ............................................................................................................ 92.1 Theory of Operation for the PGA308 Test Board Hardware .......................................................... 102.2 Signal Definition of J1 (25-Pin Male DSUB) on the PGA308 Test Board ........................................... 112.3 Signal Definition of J2 (25-Pin Female DSUB) on the PGA308 Test Board ........................................ 122.4 Theory of Operation For the USB DAQ Platform ...................................................................... 13
3 Hardware Connections and Jumper Settings ............................................................... 153.1 Typical Hardware Connections ........................................................................................... 153.2 Connecting the Hardware ................................................................................................. 163.3 Connecting Power .......................................................................................................... 173.4 Connecting the USB Cable to the PGA308EVM ....................................................................... 183.5 Jumper Settings ............................................................................................................ 19
4 PGA308 Software Overview ....................................................................................... 234.1 Operating Systems for the PGA308 Software .......................................................................... 234.2 PGA308EVM Software Install ............................................................................................ 234.3 Starting the PGA308EVM Software ...................................................................................... 244.4 Using the PGA308 Software .............................................................................................. 274.4.1 Block Diagram ..................................................................................................... 274.4.2 Registers in OTP .................................................................................................. 274.4.3 Registers in RAM .................................................................................................. 274.4.4 Calibration ......................................................................................................... 274.4.5 Simulation ......................................................................................................... 274.4.6 Graph .............................................................................................................. 274.5 EVM Pull-Down Menus .................................................................................................... 284.5.1 PGA308 Controls ................................................................................................. 284.5.2 USB Controls ...................................................................................................... 284.5.3 Help ................................................................................................................. 29
A Bill of Materials ........................................................................................................ 31A.1 Resistors and Capacitors.................................................................................................. 31A.2 Active Devices and Miscellaneous ....................................................................................... 32
Important Notices ............................................................................................................... 33
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List of Figures
1-1 Hardware Included with the PGA308EVM ................................................................................ 82-1 Hardware Setup for the PGA308EVM .................................................................................... 92-2 Block Diagram of the PGA308 Test Board ............................................................................. 102-3 Theory of Operation For the USB DAQ Platform ...................................................................... 133-1 Typical Hardware Connections ........................................................................................... 153-2 Connecting the Two EVM PCBs ......................................................................................... 163-3 Connecting Power to the EVM ........................................................................................... 173-4 Connecting the USB Cable ............................................................................................... 183-5 Default Jumper Settings ................................................................................................... 194-1 PGA308EVM Software—Functioning Properly ......................................................................... 244-2 PGA308EVM Software—No Communication with the USB DAQ Platform ......................................... 254-3 PGA308EVM Software—No Communication from USB DAQ Platform to PGA308 .............................. 264-4 PGA309 Controls ........................................................................................................... 284-5 USB Controls ............................................................................................................... 284-6 Current Revision of Software ............................................................................................. 29
List of Tables
2-1 Signal Definition of J1 ..................................................................................................... 112-2 Signal Definition of J2 ..................................................................................................... 123-1 PGA308 Test Board Jumper Function ................................................................................... 203-2 USB DAQ Platform Jumper Settings (5V Power Supply) ............................................................. 21
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Preface
SBOU060 – July 2008
About This Manual
This user's guide describes the characteristics, operation, and use of the PGA308 evaluation module(EVM). It discusses the processes and procedures required to properly use this EVM board. Thisdocument also includes the physical printed circuit board (PCB) layout, schematic diagram, and circuitdescriptions.
Related Documentation from Texas InstrumentsThe following documents provide information regarding Texas Instruments integrated circuits used in theassembly of the PGA308EVM. These documents are available from the TI web site under the respectiveliterature number (for example, SBxxnnn). Any letter appended to the literature number corresponds to thedocument revision that is current at the time of the writing of this User’s Guide. Newer revisions may beavailable from the TI web site at www.ti.com , or call the Texas Instruments Literature Response Center at(800) 477-8924 or the Product Information Center at [phone]. When ordering, identify thedocument by both title and literature number.Documents Literature Number
PGA308 SBOS440XTR116 SBOS124TUSB3210 SLLS466USB DAQ Platform SBOU056
Information About Cautions and WarningsThis document contains caution statements.
CAUTION
This is an example of a caution statement. A caution statement describes asituation that could potentially damage your software or equipment.
The information in a caution or a warning is provided for your protection. Please read each cautioncarefully.
FCC Warning
This equipment is intended for use in a laboratory test environment only. It generates, uses, and canradiate radio frequency energy and has not been tested for compliance with the limits of computingdevices pursuant to subpart J of part 15 of FCC rules, which are designed to provide reasonableprotection against radio frequency interference. Operation of this equipment in other environments maycause interference with radio communications, in which case the user at his own expense is required totake whatever measures may be required to correct this interference.
Windows Vista is a trademark of Microsoft Corporation.Microsoft, Windows are registered trademarks of Microsoft Corporation.All other trademarks are the property of their respective owners.
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Chapter 1SBOU060 – July 2008
Overview
This document provides the information needed to set up and operate the PGA308EVM evaluationmodule, a test platform for the PGA308 Programmable Bridge Sensor . For a more detailed description ofthis device, please refer to the PGA308 product data sheet (SBOS440) available from the TexasInstruments web site at www.ti.com . Support documents are listed in the section of this guide entitledRelated Documentation from Texas Instruments .
The PGA308EVM is an evaluation module that is used to fully evaluate the PGA308 device. The PGA308is a mixed-signal programmable gain amplifier that has high resolution gain and offset adjustmentcapability.
The PGA308EVM consists of two PCBs. One board generates the digital signals (USB DAQ Platform)required to communicate with the PGA308 (PGA308_Test_Board), and the second board contains thePGA308, as well as support and configuration circuitry.
Note: Note: Much of the information contained in this document is also contained in the QuickStartVideo (SBOU059) , which is included with the EVM kit. It is highly recommended that youwatch this video before using this EVM.
Throughout this document, the abbreviation EVM and the term evaluation module are synonymous withthe PGA308EVM.
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1.1 PGA308EVM Hardware
PGA308EVM Hardware www.ti.com
Figure 1-1 shows the hardware included with the PGA308EVM kit. Contact the factory if any component ismissing. It is highly recommended that you check the TI web sit at www.ti.com to verify that you have thelatest software version. It is also recommended that you watch the QuickStart Video (included on thecompact disk) before using the PGA308EVM.
The complete kit includes the following items:•PGA308 test PCB•USB DAQ platform PCB•USB cable•Universal 6V wall-wart power supply•QuickStart Video
Figure 1-1. Hardware Included with the PGA308EVM
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USB DAQ
Platform
PGA308
Test Board
Sensor
Connections
EVM
Power
Chapter 2SBOU060 – July 2008
System Setup
Figure 2-1 shows the system setup for the PGA308EVM. The PC runs software that communicates withthe USB DAQ platform. The USB DAQ platform generates the digital signals used to communicate withthe PGA308 test board. Connectors on the PGA308 test board allow for connection to the system that willbe monitored by the user.
Minimim PC operating requirements:•Microsoft
®
Windows
®
XP or higher (including Windows Vista™)•USB port•Works on US or European regional settings
Figure 2-1. Hardware Setup for the PGA308EVM
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2.1 Theory of Operation for the PGA308 Test Board Hardware
PGA308
One-Wire
Interface
V (5.0V Power)
DUT
Connection to
Sensor
25-Pin Male DSUB Signals
from USB DAQ Platform
25-Pin Female DSUB Signals
from USB DAQ Platform
Sensor
Emulator
4-20mA
V/I
Reference
Configure
Clamp
Connection
to VOUT
Connection
to VREF
Connection
to VCLAMP
Theory of Operation for the PGA308 Test Board Hardware www.ti.com
Figure 2-2 shows the block diagram of the PGA308 test board. The PGA308 test board functionality isrelatively simple. It provides connections to the one-wire interface, digital-to-analog converter (DAC),analog-to-digital converter (ADC), and general-purpose inputs/outputs (GPIOs) on the USB DAQ platform.It also provides connection points for external connection of the bridge sensor, reference, and outputs.
Figure 2-2. Block Diagram of the PGA308 Test Board
Refer to SBOR004 for the PGA308 test board schematic, available for download at www.ti.com .
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