Texas Instruments PGA309EVM-USB User manual

User's Guide
SBOU084A–February 2010–Revised February 2011
PGA309EVM-USB
This user’s guide describes the characteristics, operation, and use of the PGA309EVM-USB evaluation
module (EVM). This EVM is designed to evaluate the performance of the PGA309, a voltage output,
programmable sensor conditioner. This document covers all pertinent areas involved to properly use this
EVM board, allowing for user evaluation suitable to a variety of applications. This document also includes
the physical printed circuit board (PCB) layout and circuit descriptions. A schematic of the
PGA309EVM-USB is available as a separate download from the TI web site.
Contents
1 Introduction and Overview ................................................................................................. 2
2 System Setup ................................................................................................................ 5
3 PGA309EVM-USB Hardware Setup .................................................................................... 16
4 PGA309EVM-USB Software Overview ................................................................................. 25
List of Figures
1 Hardware Included with the INA282-286EVM........................................................................... 3
2 PGA309EVM-USB Hardware Setup...................................................................................... 5
3 PGA309_Test_Board Block Diagram .................................................................................... 5
4 PGA309_Test_Board Schematic: Input Circuitry ....................................................................... 7
5 PGA309_Test_Board Schematic: Power, Reference, and Digital Connections.................................... 8
6 PGA309_Test_Board Schematic: Output Circuitry..................................................................... 9
7 PGA309_Test_Board Schematic: Sensor Emulator Circuitry........................................................ 10
8 PGA309_Test_Board Connections to USB-DAQ-Platform and EEPROM......................................... 11
9 Theory of Operation For USB-DAQ-Platform.......................................................................... 16
10 PGA309EVM-USB Typical Hardware Connections................................................................... 17
11 Connecting the Two EVM PCBs ........................................................................................ 18
12 Connecting Power to the EVM........................................................................................... 19
13 Connecting the USB Cable............................................................................................... 20
14 Default Jumper Settings (PGA309_Test_Board)...................................................................... 21
15 Default Jumper Settings (USB-DAQ-Platform) ........................................................................ 22
16 PGA309EVM-USB Software: Block Diagram.......................................................................... 26
17 PGA309EVM-USB Software: Registers Tab........................................................................... 27
18 PGA309EVM-USB Software: Set-Up Cal Tab......................................................................... 28
19 PGA309EVM-USB Software: Auto Calibrate Tab..................................................................... 29
20 PGA309EVM-USB Software: EEPROM Tab .......................................................................... 30
21 PGA309EVM-USB Software: Set-Up Cal Tab with Select Model File Dialog..................................... 31
22 PGA309EVM-USB Software: Set-Up Cal Tab with Create Model Dialog.......................................... 32
23 PGA309EVM-USB Software: Set-Up Cal Tab with Sensor Emulator Control Tool Dialog ...................... 33
24 PGA309EVM-USB Software: Set-Up Cal Tab with Configure DMM Interface Dialog............................ 34
25 PGA309EVM-USB Software: Auto Calibrate Tab with Auto-Continue Feature Enabled ........................ 35
26 PGA309EVM-USB Software: Auto Calibrate Tab at Start of Calibration Process................................ 36
Microsoft, Windows are registered trademarks of Microsoft Corporation.
I2C is a trademark of NXP Semiconductors.
All other trademarks are the property of their respective owners.
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27 PGA309EVM-USB Software: Auto Calibrate Tab with Calibration in Progress................................... 37
28 PGA309EVM-USB Software: Auto Calibrate Tab with Second Calibration in Progress......................... 38
29 PGA309EVM-USB Software: Auto Calibrate Tab with Both Calibrations Complete ............................. 39
30 PGA309EVM-USB Software: Create Model, Select Pre-Cal File................................................... 40
31 PGA309EVM-USB Software: Create Model Dialog with Create Pre-Cal File Active............................. 41
32 PGA309EVM-USB Software: Create Model Dialog with Create Sensor File Active.............................. 42
33 PGA309EVM-USB Software: Create Model Dialog with Model ID Active ......................................... 43
34 PGA309EVM-USB Software: Create Model Dialog with Save File Active......................................... 44
35 PGA309EVM-USB Software: Create Pre-Cal File Dialog with Sensor Emulator Control Tool.................. 45
36 PGA309EVM-USB Software: Create Sensor Emulator File ......................................................... 47
37 PGA309EVM-USB Software: Create Sensor Emulator File with Additional Tabs ................................ 48
38 PGA309EVM-USB Software: Create Sensor Emulator File by Entering Raw Bridge Sensor Data............ 49
39 PGA309EVM-USB Software: Create Sensor Emulator File by Entering Temperature Data.................... 50
40 PGA309EVM-USB Software: Save a Created Sensor Emulator File .............................................. 51
List of Tables
1 PGA309 Test Board Parts List........................................................................................... 12
2 J1 Pinout (25-Pin Male DSUB) .......................................................................................... 14
3 J2 Pinout (25-Pin Female DSUB) ...................................................................................... 15
4 PGA309_Test_Board Jumper Functions: General.................................................................... 22
5 PGA309_Test_Board Jumper Functions: Miscellaneous Connections............................................. 23
6 PGA309_Test_Board Jumper Functions: Sensor Emulator Section ............................................... 23
7 USB-DAQ-Platform Jumper Settings ................................................................................... 24
8 Create Pre-Cal File Field Descriptions ................................................................................. 46
1 Introduction and Overview
This document provides the information needed to set up and operate the PGA309EVM-USB evaluation
module, a test platform for the PGA309 programmable sensor conditioner. For a more detailed description
of the PGA309, refer to the product data sheet (SBOS292) available from the Texas Instruments web site
at http://www.ti.com. Additional support documents are listed in the section of this guide entitled Related
Documentation from Texas Instruments.
The PGA309EVM-USB is an evaluation module that is used to fully evaluate the PGA309. The PGA309 is
an integrated circuit that provides temperature compensation and linearization for bridge sensors. The
PGA309EVM-USB consists of two PCBs. One board (the USB-DAQ-Platform) generates the digital
signals required to communicate with the PGA309. The other board (the PGA309_Test_Board) contains
the PGA309 device, as well as support and configuration circuitry.
Throughout this document, the abbreviation EVM and the term evaluation module are synonymous with
the PGA309EVM-USB.
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www.ti.com Introduction and Overview
1.1 PGA309EVM-USB Hardware
Figure 1 shows the hardware included with the PGA309EVM-USB kit. Contact the factory if any
component is missing. It is highly recommended that you check the TI web site (at http://www.ti.com) to
verify that you have the latest software. It is also recommended that you refer to the PGA309 User's Guide
if you have questions about the PGA309 device itself.
The complete kit includes the following items:
• PGA309_Test_Board
• USB DAQ Platform Board
• USB cable
• 6V wall power-supply unit
• CD-ROM containing this user's guide and product software
Figure 1. Hardware Included with the INA282-286EVM
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1.2 Related Documentation from Texas Instruments
The following documents provides information regarding Texas Instruments integrated circuits used in the
assembly of the PGA309EVM-USB. This user's guide is available from the TI web site under literature
number SBOU084. Any letter appended to the literature number corresponds to the document revision
that is current at the time of the writing of this document. Newer revisions may be available from the TI
web site at http://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
PGA309 SBOS292
USB DAQ Platform Users Guide SBOU056
PGA309 Users Guide SBOU024
OPA333 Product Data Sheet SBOS351
DAC8555 Product Data Sheet SLAS475
XTR117 Product Data Sheet SBOS344
PGA309EVM-USB Schematic SBOR010
Sensor-Emulator EVM Reference Guide SBOA102
1.3 If You Need Assistance
If you have questions about the PGA309EVM-USB evaluation module, send an e-mail to the Linear
Application Team at [email protected]. Include PGA309EVM-USB 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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USB DAQ
Platform
PGA309
Test Board
EVM
Power
PGA309
V Supply
Switched 5.0V Power
DUT
One-Wire Interface
25-Pin
Male DSUB Signals
From USB DAQ Platform
25-Pin
Female DSUB Signals
From USB DAQ Platform
I C
Interface
2
4mA to 20mA
I/V Converter
Sensor
Connection
Sensor
Emulator
www.ti.com System Setup
2 System Setup
Figure 2 shows the system setup for the PGA309EVM. The PC runs software that communicates with the
USB-DAQ-Platform. The USB-DAQ-Platform generates the digital signals used to communicate with the
PGA309_Test_Board. Connectors on the PGA309_Test_Board allow for connection to the bridge sensor.
Figure 2. PGA309EVM-USB Hardware Setup
2.1 Theory of Operation for PGA309_Test_Board Hardware
Figure 3 shows the block diagram of the PGA309_Test_Board. The PGA309_Test_Board provides
connections to the I2C™, one-wire, analog-to-digital converters (ADCs) and digital-to-analog converters
(DACs) on the USB-DAQ-Platform. It also provides connection points for external connection of the bridge
sensor. The PGA309_Test_Board has circuitry to convert the PGA309 voltage output to 4mA to 20mA
current.
Figure 3. PGA309_Test_Board Block Diagram
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The PGA309_Test_Board also has an onboard sensor emulator. The sensor emulator is a circuit that
generates the same type of signals generated by a bridge sensor. The sensor emulator circuit is controlled
by the PGA309EVM-USB software. Using the sensor emulator allows you to get a deeper understanding
of the PGA309EVM-USB software and hardware more quickly. When the capabilities and functions of the
PGA309EVM-USB are fully understood, you can connect the real-world sensor to the EVM and perform a
full calibration.
Note that calibrations with real-world sensors are time-consuming because devices such as these are
normally calibrated at multiple temperatures in an environmental chamber. It is not unusual for
temperature calibration to require 12 hours.
2.2 PGA309_Test_Board Connections
See Figure 4 for the input connections on the PGA309_Test_Board schematic. T1 provides the power
connection for an external bridge sensor. T4 allows connections to each input of the external bridge
sensor. T5 allows connection of the external temperature sensor. JMP7, JMP4, JMP5, and JMP6 allow
users to select either the onboard sensor emulator or an external sensor. JMP12 allows users to choose
between VSor VEXC for the sensor power.
The input is filtered with R3, R4, C14, C15, and C16. Note that C14 is ten times larger then C15, and C16
is used for good ac common-mode rejection. The cutoff frequency of this filter is 40.6Hz (f = 1/(2 πR3
C14)). This input filter is recommended in your final design if you have available board space.
VEXC has a 100pF capacitor and TEMPin has a 1nF capacitor. These components are also recommended
in your final design.
Refer to Figure 5 to see the power, reference, and digital connections on the PGA309_Test_Board
schematic. T2 provides a connection for an external reference voltage. JMP1 and JMP2 allow users to
select between the internal reference, an external reference, or power-supply reference. JMP7 and JMP8
allows users to connect the One-Wire signal to the PRG pin directly or through VOUT.
D2 is a transient voltage suppressor. It is useful in helping to prevent damage in an electrical overstress
(EOS) condition. R5 is useful in preventing EOS damage to the output. C6 filters noise at the output. C5
filters the reference output. These components are recommended for your design if PCB space permits.
C4 is a decoupling capacitor; it is required in the final design.
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Figure 4. PGA309_Test_Board Schematic: Input Circuitry
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Figure 5. PGA309_Test_Board Schematic: Power, Reference, and Digital Connections
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Figure 6 shows the output section of the PGA309EVM_Test_Board. There are two output options: voltage
output and current output. The voltage output option is selected by placing JMP9 in the NC position. The
current output option is selected by moving JMP9 to the VOUT to XTR position.
Figure 6. PGA309_Test_Board Schematic: Output Circuitry
In voltage output mode, C10 = 10nF is connected to the PGA309 output. This capacitor is used for radio
frequency interference (RFI) and electromagnetic interference (EMI) immunity. This component should be
included in your design, if possible.
In current output mode, the PGA309 output is connected to a voltage-to-current (V-I) converter (XTR117).
The sum of R6 and R8 convert the output voltage from the PGA309 to an input current for the XTR117.
R7 can be used to create an input offset current using the reference. The total input current is IIN = VOUT /
(R6 + R8) + VREF/R7. The output current is equal to the input current times the current gain (x 100).
D4 is used for reverse polarity protection. D3 is used for over-voltage transient protection. D3 was
selected for low leakage. Leakage on D3 directly contributes to error. C11 is a decoupling capacitor and is
required for proper operation. The external transistor, Q1, conducts the majority of the full-scale output
current. Power dissipation in this transistor can approach 0.8W with high loop voltage (40V) and 20mA
output current.
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Figure 7 shows the sensor emulator circuit. The sensor emulator generates signals to help users evaluate
the PGA309. No part of this circuit is required in your final design. The sensor emulator uses a DAC8555
(U8) to generate an emulated temperature signal, common-mode signal, and differential signal. These
signals can be controlled using software to produce levels that closely match real-world sensors.
Figure 7. PGA309_Test_Board Schematic: Sensor Emulator Circuitry
The operational amplifier U4 and associated resistors is a differential amplifier with jumper selectable
attenuation. The possible attenuations are 0.12 and 0.012. The attenuation produces a more accurate and
stable emulated sensor output. For example, when the DAC outputs 3V, the sensor emulator outputs 3V ×
0.012 = 36mV (assuming that attenuation is set in the 0.012 position). Thus, the maximum output of the
sensor emulator is 120mV/V and 12mV/V.
The op amp U6 buffers the emulated temperature signal. Resistors R16, R17, R18, and R19 are used to
attenuate the DAC output for temperature emulation and to reference the temperature signal to supply or
ground. JMP13 allows the resistor network to be bypassed for direct connection to the DAC (diode
temperature sensor mode).
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Figure 8 illustrates the two 25-pin D-SUB connectors J1 and J2. These connectors provide all the signals
necessary to communicate with the PGA309. U5 is the EEPROM used to store the calibration look-up
table used with the PGA309.
Figure 8. PGA309_Test_Board Connections to USB-DAQ-Platform and EEPROM
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2.3 PGA309_Test_Board Parts List
Table 1 describes the parts list for the PGA309_Test_Board.
Table 1. PGA309 Test Board Parts List
Qty Value Ref Des Description Vendor Part Number
Capacitor, ceramic 560pF 50V NP0
1 560pF C6 Panasonic - ECG ECJ-1VC1H561J
0603
Capacitor, ceramic 560pF 50V NP0
3 100pF C3 C5, C13 ECJ-1VC2A101J
0603
Capacitor, 0.1µF 25V, ceramic Y5V
6 0.1µF C4, C7, C8, C9, C14, C17 Kemet CC0603ZRY5V8BB104
0603
Capacitor, ceramic .01µF 10%
2 .01µF C15, C16 AVX 06031C103KAT2A
100V X7R 0603
Capacitor, 1000pF, 100V, ceramic
1 1nF C18 Panasonic - ECG ECJ-1VB2A102K
X7R 0603
Capacitor, 10000pF, 50V, ceramic
2 10nF C10, C11 Kemet C0603C103K5RACTU
X7R 0603
Capacitor, ceramic 22000pF, 100V
1 0.02µF C12 TDK Corporation C1608X7R2A223K
X7R 10%0603
1 1000pF C2 Omit; not installed JOHANSON DIELECTRICS 501R18W102KV4E
Resistor, 100kΩ1/6W 0.1% 0603
4 100kΩR11, R15, R18, R19 Susumu Co Ltd RGH1608-2C-P-104-B
SMD
Resistor, 1.2kΩ1/6W 0.1% 0603
2 1.2kΩR12, R13 Susumu Co Ltd RGH1608-2C-P-122-B
SMD
Resistor, 10.0kΩ1/6W 0.1% 0603
5 10kΩR8, R10, R14, R16, R17 Susumu Co Ltd RGH1608-2C-P-103-B
SMD
Resistor, 100kΩ1/10W 1% 0603
4 100ΩR5, R20, R21, R22 Yageo Corporation RC0603FR-07100RL
SMD
Resistor, 191kΩ1/10W 1% 0603
1 191kΩR7 Yageo Corporation ERJ-3EKF1913V
SMD
Resistor, 11.3kΩ1/10W 1% 0603
1 11.3kΩR6 Yageo Corporation ERJ-3EKF1132V
SMD
Resistor, 39.2kΩ1/10W 1% 0603
2 39.2kΩR3, R4 Yageo Corporation RC0603FR-0739K2L
SMD
Resistor, 49.9kΩ1/16W .5% 0603
1 50kΩR23 Sunsuma RR0816P-4992-D-68C
SMD
Resistor, 2.49kΩ1/16W .5% 0603
1 2.49kΩR24 Sunsuma RR0816P-2491-D-39H
SMD
0 omit R1, R2, R9 Omit; not installed
1 PGA309 U1 Smart Programmable Sensor Texas Instruments PGA309AIPWT
Connector, Jack BNC Vertical 50Ω
1 BNC P1 Tyco Electronics/Amp 5227699-1
PCB
OPA333AID
2 U4 U6 IC Op Amp 1.8V 0-DRIFT SOT23-5 Texas Instruments OPA333AIDBVT
BVT
1 DAC8555 U3 IC DAC 16BIT QUAD 16-TSSOP Texas Instruments DAC8555IPW
IC SRL EEPROM 16K 2.5V
1 24LC16BT U5 Microchip Technology 24LC16BT-I/OT
SOT23-5
IC 4mA-20mA Current-Loop TX
1 XTR117 U2 Texas Instruments XTR117AIDGKT
8-MSOP
6.8V TVS Zener Unidirectional 600W
1 D2 ON Semiconductor P6SMB6.8AT3G
transzorb 6.8V SMB
Micro Commercial
1 SMAJ43A D3 TVS 400W 43V Unidirectional SMA SMAJ43A-TP
Components
Diode, Schottky 70V 200mA Micro Commercial
1 BAS70TP D4 BAS70TPMSCT-ND
SOT23 Components
IC, Transistor NPN SS GP 1.5A
1 NPN Q1 Fairchild Semiconductor BCP55
SOT223-4
2-Position Terminal Strip, Cage
5 ED300/2 T1, T2, T3, T4, T5 On-Shore Technology Inc ED300/2
Clamp, 45º, 15A, Dove-tailed
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Table 1. PGA309 Test Board Parts List (continued)
Qty Value Ref Des Description Vendor Part Number
JMP1, JMP2, JMP3, JMP4,
JMP5, JMP6, JMP7, JMP8,
JUMP2 Cut Terminal strip, 3-position, .100
17 JMP9, JMP10, JMP11, Samtec TSW-103-07-G-S
to Size centers, .025 square pins
JMP12, JMP13, JMP14,
JMP15, JMP16, JMP17,
V_Sensor, OPA_O1, C1,
B1, A,1 TempIn, GND1, D1,
GND2, VEXC, VREF,
TP Cut to Terminal strip, 1-position, .100
24 VOUT_F1, VIN2, PRG1, Samtec TSW-101-07-G-S
Size centers, .025 square pins
VOUT1, VFB1, VS1, SCL1,
VSJ1, GND4, VIN1, SDA1,
GND3, Test1,
JMP1, JMP2, JMP3, JMP4,
JMP5, JMP6, JMP7, JMP8,
Jumper Shunt LP w/Handle 2-position,
17 JMP9, JMP10, JMP11, Tyco Electronics Amp 881545-2
Shunts 30AU
JMP12, JMP13, JMP14,
JMP15, JMP16, JMP17,
Connector, D-SUB PLUG R/A
1 DSUB25M J1 25POS 30GOLD (with Threaded AMP/Tyco Electronics 5747842-4
Inserts and Board locks)
Connector, D-SUB RCPT R/A
1 DSUB25F J2 25POS 30GOLD (with Threaded AMP/Tyco Electronics 5747846-4
Inserts and Board locks)
Standoffs, Hex , 4-40 Threaded,
4 Standoffs 0.500" length, 0.250" OD, Keystone 2203
Aluminum Iridite Finish
Machine Screw, 4-40x3/8" Phillips
4 Screws Building Fasteners PMS 440 0038 PH
PanHead, Steel, Zinc Plated
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2.4 PGA309_Test_Board: Signal Definitions and Pinouts
This section provides the signal definitions for the PGA309_Test_Board.
2.4.1 J1 (25-Pin Male DSUB)
Table 2 shows the different signals connected to J1 on the PGA309_Test_Board. This table also identifies
signals connected to pins on J1 that are not used on the PGA309_Test_Board.
Table 2. J1 Pinout (25-Pin Male DSUB)
Pin on J1 Signal Used on This EVM PGA309 Pin
1 DAC A No
2 DAC B No
3 DAC C No
4 DAC D No
5 ADS1+ No
6 ADS1- No
7 ADS2+ No
8 ADS2– No
9 I2C_SCK No
10 I2C_SDA2 No
11 ONE_WIRE No
12 I2C_SCK_ISO Yes SCL
13 I2C_SDA_ISO Yes SDA
14 XTR_LOOP+ No
15 XTR_LOOP– No
16 INA– No
17 VDUT Yes VS
18 VCC No
19 +15v No
20 –15v No
21 GND Yes GND
22 SPI_SCK No
23 SPI_CS1 No
24 SPI_DOUT No
25 SPI_DIN1 No
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2.4.2 J2 (25-Pin Female DSUB)
Table 3 shows the different signals connected to J2 on the PGA309_Test_Board. This table also identifies
signals connected to pins on J2 that are not used on PGA309_Test_Board.
Table 3. J2 Pinout (25-Pin Female DSUB)
Pin on J2 Signal Used on This EVM PGA309 Pin
1 NC No
2 CTRL1 Yes Convert
3 CTRL2 Yes GPIO
4 CTRL3 No
5 CTRL4 No
6 CTRL5 No
7 CTRL6 No
8 CTRL7 No
9 CTRL8 No
10 MEAS1 Yes Warning
11 MEAS2 Yes GPIO
12 MEAS3 Yes Overlimit
13 MEAS4 Yes Critical
14 MEAS5 Yes ALT
15 MEAS6 No
16 MEAS7 No
17 MEAS8 No
18 SPI_SCK No
19 SPI_CS2 No
20 SPI_DOUT2 No
21 SPI_DIN2 No
22 VDUT No VS
23 VCC No
24 GND Yes GND
25 GND Yes GND
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TUSB3210
8052 C
with USB Interface
and UART
m
USB Bus
From Computer
3.3V
Regulator
Adjustable
Regulator
V
(2.7V to 5.5V)
CC
VmC
3.3V
S
V_USB
5V
8Kx8 Byte
EEPROM
Buffers and
Latches
Power
Switching
V
(2.7V to 5.5V)
DUT
Switched Power
I C, SPI
Control Bits, and
Measure Bits
2
External
Power
(6V )
DC
Reset Button
and
Power-On Reset USB DAQ Platform
Calibration
EEPROM
Loop-Switching
Circuit
4mA to 20mA
Loop Receiver
External Power
V = 40V
Loop Measurement
Circuitry = 15V
LOOP DC
±
2x 16-Bit
Delta-Sigma ADC
2x 16-Bit
Delta-Sigma ADC
2x 16-Bit
Delta-Sigma ADC
Reference
Circuits
4x 16-Bit
String DAC
4mA to 20mA
Receiver
To Test Board
To PC and Power Supplies
PGA309EVM-USB Hardware Setup www.ti.com
2.5 Theory of Operation for USB-DAQ-Platform
Figure 9 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 details of
its operation are included in a separate document (available for download at www.ti.com). The block
diagram shown in Figure 9 gives a brief overview of the platform. The primary control device on the
USB-DAQ-Platform is the TUSB3210.
Figure 9. Theory of Operation For USB-DAQ-Platform
3 PGA309EVM-USB Hardware Setup
The PGA309EVM-USB Hardware setup involves connecting the two halves of the EVM together, applying
power, connecting the USB cable, and setting the jumpers. This section covers the details of this
procedure.
3.1 Electrostatic Discharge Warning
Many of the components on the PBA309EVM-USB 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.
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3.2 Typical Hardware Connections
To set up the PGA309EVM-USB hardware, connect the two halves of the EVM together, apply power, and
then connect the external sensor. Figure 10 shows the typical hardware connections.
Figure 10. PGA309EVM-USB Typical Hardware Connections
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3.3 Connecting the Hardware
To connect the two PCBs of the PGA309EVM-USB together, gently push on both sides of the D-SUB
connectors (as shown in Figure 11). Make sure that the two connectors are completely pushed together;
that is, loose connections may cause intermittent operation.
Figure 11. Connecting the Two EVM PCBs
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www.ti.com PGA309EVM-USB Hardware Setup
3.4 Connecting Power
After the two parts of the PGA309EVM-USB are connected, as shown in Figure 12, 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 12. Connecting Power to the EVM
19
SBOU084A–February 2010–Revised February 2011 PGA309EVM-USB
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PGA309EVM-USB Hardware Setup www.ti.com
3.5 Connecting the USB Cable to the PGA309EVM-USB
Figure 13 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 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.
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 13. Connecting the USB Cable
20 PGA309EVM-USB SBOU084A–February 2010–Revised February 2011
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