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User's Guide
SBOU084–February 2010
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) lay
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Introduction and Overview www.ti.com 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..............................
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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 Pl
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Introduction and Overview www.ti.com 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 s
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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. EVM Power PGA309 USB DAQ Test Board Platform Figure 2. PGA309EVM-USB Hardware Setup 2.1 Theory of Operation for PGA309_Test_Board Hardware Figure 3 shows the block di
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System Setup www.ti.com 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
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www.ti.com System Setup Figure 4. PGA309_Test_Board Schematic: Input Circuitry 7 SBOU084–February 2010 PGA309EVM-USB Submit Documentation Feedback Copyright © 2010, Texas Instruments Incorporated
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System Setup www.ti.com Figure 5. PGA309_Test_Board Schematic: Power, Reference, and Digital Connections 8 PGA309EVM-USB SBOU084–February 2010 Submit Documentation Feedback Copyright © 2010, Texas Instruments Incorporated
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www.ti.com System Setup 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 V to XTR position. OUT 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
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System Setup www.ti.com 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
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www.ti.com System Setup 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 11 SBOU084–February 2010 PGA309EVM-USB Submit Documentation Feedback Copyright © 2010, Texas Instruments Incorporated
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System Setup www.ti.com 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
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www.ti.com System Setup 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, V , V , EXC REF TP Cut to Terminal strip, 1-position, .100 24 V _F1, V 2, PRG1, Samtec TSW-101-07-G-S OUT IN Si
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System Setup www.ti.com 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 A
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www.ti.com System Setup 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 Ye
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To Test Board 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
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www.ti.com PGA309EVM-USB Hardware Setup 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 17 SBOU084–February 2010 PGA309EVM-USB Submit Documentation Feedback Copyright © 2010, Texas Instruments Incorporated
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PGA309EVM-USB Hardware Setup www.ti.com 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 18 PGA309EVM-USB SBOU084–February 2010 Submit Documentation Feedback Copyright © 2010, Texas Instruments Incorporated
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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 SBOU084–February 2010 PGA309EVM-USB Submit Documentation Feedback Copyright
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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 U
