Texas Instruments PGA308EVM User manual

PGA308EVM
User's Guide
Literature Number: SBOU060A
July 2008–Revised September 2016

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Contents
Contents
Preface ........................................................................................................................................ 4
1 Overview............................................................................................................................. 5
1.1 PGA308EVM Hardware..................................................................................................... 6
2 System Setup ...................................................................................................................... 7
2.1 Theory of Operation for the PGA308 Test Board Hardware........................................................... 8
2.2 Signal Definition of J1 (25-Pin Male DSUB) on the PGA308 Test Board ............................................ 9
2.3 Signal Definition of J2 (25-Pin Female DSUB) on the PGA308 Test Board........................................ 10
2.4 Theory of Operation For the USB DAQ Platform ...................................................................... 11
3 Hardware Connections and Jumper Settings......................................................................... 12
3.1 Typical Hardware Connections........................................................................................... 12
3.2 Connecting the Hardware................................................................................................. 13
3.3 Connecting Power.......................................................................................................... 14
3.4 Connecting the USB Cable to the PGA308EVM....................................................................... 15
3.5 Jumper Settings ............................................................................................................ 16
4 PGA308 Software Overview ................................................................................................. 19
4.1 Operating Systems for the PGA308 Software.......................................................................... 19
4.2 PGA308EVM Software Install ............................................................................................ 19
4.3 Starting the PGA308EVM Software...................................................................................... 20
4.4 Using the PGA308 Software.............................................................................................. 23
4.4.1 Block Diagram ..................................................................................................... 23
4.4.2 Registers in OTP .................................................................................................. 23
4.4.3 Registers in RAM.................................................................................................. 23
4.4.4 Calibration.......................................................................................................... 23
4.4.5 Simulation .......................................................................................................... 23
4.4.6 Graph ............................................................................................................... 23
4.5 EVM Pull-Down Menus.................................................................................................... 24
4.5.1 PGA308 Controls.................................................................................................. 24
4.5.2 USB Controls ...................................................................................................... 24
4.5.3 Help ................................................................................................................. 25
A Bill of Materials .................................................................................................................. 26
A.1 Resistors and Capacitors.................................................................................................. 26
A.2 Active Devices and Miscellaneous....................................................................................... 27
Revision History.......................................................................................................................... 28

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List of Figures
List of Figures
1-1. Hardware Included With the PGA308EVM............................................................................... 6
2-1. Hardware Setup for the PGA308EVM .................................................................................... 7
2-2. Block Diagram of the PGA308 Test Board............................................................................... 8
2-3. Theory of Operation For the USB DAQ Platform ...................................................................... 11
3-1. Typical Hardware Connections........................................................................................... 12
3-2. Connecting the Two EVM PCBs ......................................................................................... 13
3-3. Connecting Power to the EVM ........................................................................................... 14
3-4. Connecting the USB Cable ............................................................................................... 15
3-5. Default Jumper Settings................................................................................................... 16
4-1. PGA308EVM Software—Functioning Properly......................................................................... 20
4-2. PGA308EVM Software—No Communication with the USB DAQ Platform......................................... 21
4-3. PGA308EVM Software—No Communication from USB DAQ Platform to PGA308 .............................. 22
4-4. PGA308 Controls........................................................................................................... 24
4-5. USB Controls ............................................................................................................... 24
4-6. Current Revision of Software ............................................................................................. 25
List of Tables
2-1. Signal Definition of J1....................................................................................................... 9
2-2. Signal Definition of J2 ..................................................................................................... 10
3-1. PGA308 Test Board Jumper Function................................................................................... 17
3-2. USB DAQ Platform Jumper Settings (5-V Power Supply)............................................................ 18
A-1. Bill of Materials ............................................................................................................. 26
A-2. Bill of Materials ............................................................................................................. 27

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PGA308EVM
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.
Preface
SBOU060A–July 2008–Revised September 2016
PGA308EVM
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. This
document also includes the physical printed circuit board (PCB) layout, schematic diagram, and circuit
descriptions.
Related Documentation from Texas Instruments
The following documents provide information regarding Texas Instruments integrated circuits used in the
assembly of the PGA308EVM. These documents are available from the TI web site under the respective
literature number (for example, SBxxnnn). Any letter appended to the literature number corresponds to the
document revision that is current at the time of the writing of this User’s Guide. Newer revisions may be
available from the TI web site at www.ti.com, or call the Texas Instruments Literature Response Center at
[phone] or the Product Information Center at [phone]. When ordering, identify the
document by both title and literature number.
Document Literature Number
PGA308 SBOS440
XTR116 SBOS124
TUSB3210 SLLS466
USB DAQ Platform SBOU056
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.
The information in a caution or a warning is provided for your protection. Read each caution carefully.
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 own expense is required to
take whatever measures may be required to correct this interference.

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Overview
Chapter 1
SBOU060A–July 2008–Revised September 2016
Overview
This document provides the information needed to set up and operate the PGA308EVM evaluation
module, a test platform for the PGA308 Programmable Bridge Sensor. For a more detailed description of
this device, see the PGA308 product data sheet (SBOS440) available from the Texas Instruments web
site at www.ti.com. Support documents are listed in the section of this guide entitled Related
Documentation from Texas Instruments.
The PGA308EVM is an evaluation module that is used to fully evaluate the PGA308 device. The PGA308
is a mixed-signal programmable gain amplifier that has high resolution gain and offset adjustment
capability.
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 the
PGA308, as well as support and configuration circuitry.
Throughout this document, the abbreviation EVM and the term evaluation module are synonymous with
the PGA308EVM.

Power Cord USB Cable
DAQ Platform
PGA 308 Test
Form
PGA308EVM Hardware www.ti.com
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Overview
1.1 PGA308EVM Hardware
Figure 1-1 shows the hardware included with the PGA308EVM kit. Contact the factory if any component is
missing. TI highly recommendeds that you check the TI web site (at http://www.ti.com) to verify that you
have the latest software.
The complete kit includes the following items:
• PGA308 test PCB
• USB DAQ platform PCB
• USB cable
• Power cord
Figure 1-1. Hardware Included With the PGA308EVM

USB DAQ
Platform
PGA 308
Test Board
EVM
Power
Sensor
Connection
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System Setup
Chapter 2
SBOU060A–July 2008–Revised September 2016
System Setup
Figure 2-1 shows the system setup for the PGA308EVM. The PC runs software that communicates with
the USB DAQ platform. The USB DAQ platform generates the digital signals used to communicate with
the PGA308 test board. Connectors on the PGA308 test board allow for connection to the system that will
be 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

PGA 308
One - Wire
Interface
VDUT (5.0 V Power)
Connection to
Sensor
25-Pin Male DSUB Signals
from USB DAQ Platform Sensor
Emulator
4-20 mA
V/I
Reference
Connection
to VOUT
Connection
to VREF
Connection
to VCLAMP
Configure
Clamp
25-Pin Female DSUB
Signals from USB DAQ
Platform
Theory of Operation for the PGA308 Test Board Hardware www.ti.com
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System Setup
2.1 Theory of Operation for the PGA308 Test Board Hardware
Figure 2-2 shows the block diagram of the PGA308 test board. The PGA308 test board functionality is
relatively 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
See SBOR004 for the PGA308 test board schematic, available for download at www.ti.com.

www.ti.com Signal Definition of J1 (25-Pin Male DSUB) on the PGA308 Test Board
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System Setup
2.2 Signal Definition of J1 (25-Pin Male DSUB) on the PGA308 Test Board
Table 2-1 shows the different signals connected to J1 on the PGA308 test board. Table 2-1 also identifies
signals connected to pins on J1 that are not used on the PGA308 test board.
Table 2-1. Signal Definition of J1
Pin Number Signal Name from USB
DAQ Platform Description
1 DAC_A To input amplifier (sensor emulator); 16-bit string DAC A output.
2 DAC_B To input amplifier (sensor emulator); 16-bit string DAC B output.
3 DAC_C To input amplifier (sensor emulator); 16-bit string DAC C.
4 DAC_D Not used
5 ADS1_VIN+ To PGA308 output; 16-bit delta-sigma (ΔΣ) ADC #1 positive input.
6 ADS1_VIN– Grounded for single-ended measurements; 16-bit ΔΣ ADC #1 negative
input.
7 ADS2_VIN+ PGA308 VIN2 input; 16-bit ΔΣ ADC #2 positive input.
8 ADS2_VIN– PGA308 VIN1 input; 16-bit ΔΣ ADC #2 negative input.
9 I2C_SCK Not used
10 I2C_SDA2 Not used
11 ONE_WIRE PGA308 1W pin; one-wire signal
(derived from the UART on the TUSB3210 device).
12 I2C_SDA_ISO Not used
13 I2C_SCK_ISO Not used
14 XTR+LOOP To XTR116 pin 7 on EVM. Current-loop positive-loop connection; this
signal is connected to the positive-loop supply.
15 XTR–LOOP To XTR116 pin 4 on EVM. Current-loop negative-loop connection; this
signal connects the DUT current output to the current measurement circuit.
16 INA– Not used
17 VDUT To PGA308 VS power-supply pin; switched 3 V or 5 V supply.
18 VCC Not used
19 +15V Not used
20 –15V Not used
21 GND Ground
22 SPI_SCK Not used
23 SPI_CS1 Not used
24 SPI_DOUT1 Not used
25 SPI_DIN1 Not used

Signal Definition of J2 (25-Pin Female DSUB) on the PGA308 Test Board www.ti.com
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System Setup
2.3 Signal Definition of J2 (25-Pin Female DSUB) on the PGA308 Test Board
Table 2-2 shows the different signals connected to J2 on the PGA308 test board. Table 2-2 also identifies
signals connected to pins on J2 that are not used on the PGA308 test board.
Table 2-2. Signal Definition of J2
Pin Number Signal Name from USB
DAQ Platform Description
1 P3.3 Not used
2 CTRL1 Not used
3 CTRL2 Not used
4 CTRL3 Not used
5 CTRL4 Not used
6 CTRL5 Not used
7 CTRL6 Not used
8 CTRL7 Not used
9 CTRL8 Not used
10 MEAS1 To DOUT on the PGA308. This pin is a measure bit that can read logic
signals; it is part of an 8-bit group.
11 MEAS2 Not used
12 MEAS3 Not used
13 MEAS4 Not used
14 MEAS5 Not used
15 MEAS6 Not used
16 MEAS7 Not used
17 MEAS8 Not used
18 SPI_SCK Not used
19 SPI_CS2 Not used
20 SPI_DOUT2 Not used
21 SPI_DIN2 Not used
22 VDUT Not used
23 VCC Not used
24 GND Not used
25 GND Not used

TUSB3210 8052 µC
with USB Interface
and UART
USB Bus from
Computer
3.3V Regulator
Adjustable
Regulator
VCC
(2.7V to 5.5V)
VSµC
3.3V
V_USB 5V
8k x 8 Byte
EEPROM
Buffers and
Latches
Power
Switching
VDUT
(2.7V to 5.5V) Switched Power
I2C SPI
Control Bits
Measure Bits
External Power
(6V DC)
Reset Button and
Power-OnReset USB DAQ Platform
Reference
Circuits
4x 16-bit String DAC
2x 16-bit DS ADC
4-20mA loop
Receiver
Loop switching
Circuit
External Power
VLOOP = 40V dc
Loop Measurement
Circuitry = ± 15V
4-20mA Reciever
2x 16-ELWø™$'&
Calibration
EEPROM
To Test Board
To Computer And
Power Supplies
2x 16-ELWø™$'&
www.ti.com Theory of Operation For the USB DAQ Platform
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System Setup
2.4 Theory of Operation For the USB DAQ Platform
Figure 2-3 shows the block diagram for the USB DAQ platform. This platform is a general-purpose data
acquisition system that is used on several different Texas Instruments evaluation modules. The block
diagram shown in Figure 2-3 illustrates the general platform outline. The core component of the USB DAQ
platform is the TUSB3210.
Figure 2-3. Theory of Operation For the USB DAQ Platform

USB
Cable
External
Sensor
6 V to 9 V
DC Power Supply
Volt Meter
4-20mA Power
(for current Loop option only)
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Hardware Connections and Jumper Settings
Chapter 3
SBOU060A–July 2008–Revised September 2016
Hardware Connections and Jumper Settings
Many of the components on the PGA308EVM 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.
3.1 Typical Hardware Connections
A typical PGA308EVM hardware setup connects the two EVM PCBs, then supplies power and connects
an external shunt and load. The external connections may be the real-world system to which the PGA308
will be connected. Figure 3-1 shows the typical hardware connections.
Figure 3-1. Typical Hardware Connections

www.ti.com Connecting the Hardware
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Hardware Connections and Jumper Settings
3.2 Connecting the Hardware
The best way to connect the two PGA308EVM PCBs together is to gently push on both sides of the DSUB
connectors, as shown in Figure 3-2. Make sure that the two connectors are completely socketed together;
loose connections may cause intermittent EVM operation.
Figure 3-2. Connecting the Two EVM PCBs

Connect 6 V to 9 V DC to T3
Note: µC OK, 3.3V, and VCC are
Illuminated.
Connecting Power www.ti.com
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Hardware Connections and Jumper Settings
3.3 Connecting Power
Connect the two PGA308EVM PCBs before connecting a power source, as shown in Figure 3-3. Always
connect power before connecting the USB cable. If the USB cable is connected before the power is
supplied, the computer will attempt to communicate with an unpowered device, and the device will not be
able to respond.
Figure 3-3. Connecting Power to the EVM

Turn on PC sound. Connect USB
connector J1 to PC USB Port.
These messages may appear the first time
the EVM is used.
www.ti.com Connecting the USB Cable to the PGA308EVM
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Hardware Connections and Jumper Settings
3.4 Connecting the USB Cable to the PGA308EVM
Figure 3-4 shows the typical response to connecting the USB DAQ platform to a PC USB port for the first
time. Note that the EVM must be powered up 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.
The USB DAQ platform uses the Human Interface Device Drivers that are part of the Microsoft Windows
operating system. In some cases, the Windows Add Hardware Wizard will pop-up. If this prompt occurs,
allow the system device manager to install the Human Interface Drivers by clicking Yes when requested to
install drivers.
Figure 3-4. Connecting the USB Cable

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Hardware Connections and Jumper Settings
3.5 Jumper Settings
Figure 3-5 shows the default jumper configuration for the PGA308EVM. In general, the jumper settings of
the USB DAQ platform do not need to be changed. However, you may want to change some of the
jumpers on the PGA308 test board to match your specific device configuration (for example, to change the
reference configuration).
Figure 3-5. Default Jumper Settings

www.ti.com Jumper Settings
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Hardware Connections and Jumper Settings
Table 3-1 explains the function of the jumpers on the PGA308 test board.
Table 3-1. PGA308 Test Board Jumper Function
Jumper Default Purpose
JMP2 VREF = Fixed/XTR Select ratiometric or absolute sensor configuration
JMP3 Fixed VREF Fixed references on the EVM or XTR reference
JMP4 4.096 V 4.096 V or 2.5 V allows selection between the two fixed
references on the EVM.
JMP5 Internal VREF
Internal references or external references. (Note: internal
references are references on the EVM. The PGA308 does not
have a reference inside the device.)
JMP6 ADS1 ADS1 or NC allows you to connect or disconnect the ADC on the
USB DAQ platform to the PGA308 output.
JMP17 Auto Auto or EXT allows connection of an external sensor or the
onboard sensor emulator signal source. The sensor emulator is
useful tool during initial development; that is, learn how the device
works before connecting the real sensor.
JMP18 Auto Auto or EXT allows connection of an external sensor or the
onboard sensor emulator signal source. The sensor emulator is a
useful tool during initial development; that is, learn how the device
works before connecting the real sensor.
JMP9 ADS–
ADS– or NC allows you to connect or disconnect the ADC on the
USB DAQ platform to the PGA308 input. Note that the ADC has a
switched capacitor input, so it can affect the input signal. It is
recommended that ADCs be disconnected when using a real-
world sensor.
JMP10 ADS+
ADS+ or NC allows you to connect or disconnect the ADC on the
USB DAQ platform to the PGA308 input. Note that the ADC has a
switched capacitor input, so it can affect the input signal. It is
recommended that ADCs be disconnected when using a real-
world sensor.
JMP13 NC VOUT to XTR or NC. Allows connection of the current-loop transmitter (XTR). In the NC position, the EVM output if voltage
only. In the VOUT to XTR position, the output is 4 mA to 20 mA.
JMP1 NC VOUT to 1W or NC. In the VOUT to 1W position, the communication
line (1W) to the analog output (VOUT). This configuration is called a
three-wire module because it only requires VS, VOUT, and GND
outputs.
JMP7 One to 1W
One to VOUT or One to 1W. In the One to VOUT position, the
communication line (1W) to the analog output (VOUT). This
configuration is called a three-wire module because it only
requires VS, VOUT, and GND outputs. In the One to 1W position, the
communication line is separate from VOUT.
JMP15 VEXC = VREF
VEXC = VREF or VEXC = VSallows choice of either the power supply
(such as ratiometric) or the reference to excite the sensor (that is,
absolute mode).
JMP11 Dout DOUT or VCLAMP allows choice between a digital output or a clamp
input.
JMP16 VCLAMP Divider VCLAMP divider or Ext VCLAMP

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Hardware Connections and Jumper Settings
Table 3-2 summarizes the function of the USB DAQ platform jumpers. For most applications, the default
jumper position should be used. A separate document (SBOU056) gives details regarding the operation
and design of the USB DAQ platform.
Table 3-2. USB DAQ Platform Jumper Settings (5-V Power Supply)
Jumper Default Purpose
JUMP17 BUS BUS or VRAW.BUS is the safe mode. The VRAW option is only used for special test modes. In the VRAW position it is possible to damage the USB DAQ platform
with voltages above 5.5 V.
JUMP13 REG REG or BUS. In the REG position the regulator provides VDUT power.
JUMP14 9 V 9 V or BUS. In the 9-V position an external power supply provides power to the
EVM. In the BUS position the USB bus powers the EVM.
JUMP9 5 V 5Vor 3 V. In the 5-V position a variable regulator is resister programmed to 5 V.
In the 3-V position a variable regulator is resistor programmed to 3 V.
JUMP6 5 V 5 V or 3 V. In the 5-V position, a stacked 5-V reference is connected to the ADCs and DACs on the USB DAQ platform. In the 3-V position, a 3-V reference
is connected to the ADCs and DACs on the USB DAQ platform.
JUMP7 Ref Ref or Reg. In the Ref position, a calibrated reference is connected to the USB DAQ platform ADC and DAC. In the Reg position, the regulator output (such as
a power-supply voltage) is connected to the USB DAQ platform ADC and DAC.
JUMP1 EXT EXT or BUS. In the external position the USB DAQ platform receives power from an external dc power source (such as through J5 or T3). The BUS position
allows for the USB bus to power the EVM. External mode is recommended.
JUMP11 WP_ON WP_ON or WP_OFF. In the WP_ON position, the calibration EEPROM is write protected. In the WP_OFF position, the calibration EEPROM is not write
protected.
JUMP8 SPD_UP SPD_UP or GND. In the SPD_UP position, the one-wire signal has a boost on the rising edge to allow for transmission over long cables. In the GND position,
the speed-up feature is turned off.
JUMP10 WP_ON WP_ON or WP_OFF. In the WP_ON position, the firmware EEPROM is write protected. In the WP_OFF position, the firmware EEPROM is not write
protected.
JUMP3 EE ON EE ON or EE OFF. In the EE ON position, the firmware EEPROM is connected
to the microcontroller for normal operation. In the EE OFF position, the firmware
EEPROM is disconnected to the microcontroller; this mode is used to program
the EEPROM.
JUMP2 EXT EXT or BUS. In the external position the USB DAQ platform receives power from an external dc power source (such as through J5 or T3). The BUS position
allows for the USB bus to power the EVM. External mode is recommended.
JUMP18 VDUT
VCC or VDUT. In the VDUT position, the digital output pull-up resistors are
connected to VCC. In the VCC position, the digital output pull-up resistors are
connected to VCC.
JUMP4 L Lor H. This jumper sets the USB DAQ platform USB address.
JUMP5 L Lor H. This jumper sets the USB DAQ platform USB address.

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PGA308 Software Overview
Chapter 4
SBOU060A–July 2008–Revised September 2016
PGA308 Software Overview
This section explains how to install and use the PGA308 software.
4.1 Operating Systems for the PGA308 Software
The PGA308 software has been tested on Windows XP with United States and European regional
settings. The software should also function on other Windows operating systems, including Windows
Vista. Please report any compatibility issues to [email protected].
4.2 PGA308EVM Software Install
Install the PGA308EVM software by following these steps:
1. Software can be downloaded from the PGA308EVM web page, or from the disk included with the
PGA308EVM, which contains a folder called Install_software/.
2. Find the file called setup.exe. Double-click the file to start the installation process.
3. Follow the on-screen prompts to install the software.
4. To remove the application, use the Windows Control Panel utility, Add/Remove Software.

Starting the PGA308EVM Software www.ti.com
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PGA308 Software Overview
4.3 Starting the PGA308EVM Software
Use the Windows Start menu to start the PGA308 software. From Start, select All Programs, then select
the PGA308EVM program. Figure 4-1 shows the software display if the EVM is functioning properly.
Figure 4-1. PGA308EVM Software—Functioning Properly