INA223EVM

User's Guide SBOU125 – June 2012 INA223EVM User’s Guide and Software Tutorial INA223EVM This user's guide describes the characteristics, operation, and use of the INA223EVM evaluation board. It discusses how to set up and configure the software and hardware, and reviews various aspects of the program operation. This user's guide also includes information regarding operating procedures and input/output connections, an electrical schematic, printed circuit board (PCB) layout drawings, and a parts list for the EVM. Throughout this document, the terms evaluation board, evaluation module, and EVM are synonymous with the INA223EVM. Microsoft, Windows are registered trademarks of Microsoft Corporation. SPI is a trademark of Motorola Inc,. I2C is a trademark of NXP Semiconductors. SBOU125 – June 2012 Submit Documentation Feedback INA223EVM User’s Guide and Software Tutorial Copyright © 2012, Texas Instruments Incorporated 1 www.ti.com INA223EVM (continued) 1 2 3 4 5 6 Contents Overview ..................................................................................................................... 3 INA223EVM Hardware Setup ............................................................................................. 4 INA223EVM Hardware Overview ......................................................................................... 7 INA223EVM Software Setup ............................................................................................. 12 INA223EVM Software Overview ......................................................................................... 14 INA223EVM Documentation ............................................................................................. 22 List of Figures 1 Hardware Included with INA223EVM Kit................................................................................. 3 2 Hardware Setup ............................................................................................................. 4 3 INA223 Test Board Block Diagram ....................................................................................... 5 4 SM-USB-DIG Platform Block Diagram ................................................................................... 6 5 Typical Hardware Test Connections on the INA223EVM.............................................................. 7 6 Connecting the USB Cable to the SM-USB-DIG Platform............................................................. 8 7 Confirmation of SM-USB-DIG Platform Driver Installation............................................................. 8 8 INA223EVM Default Jumpers ............................................................................................. 9 9 Typical Filter Setup ........................................................................................................ 11 10 INA223 Shunt Configurations ............................................................................................ 11 11 Software Install Window .................................................................................................. 12 12 Software License Agreement ............................................................................................ 13 13 Software Install Progress ................................................................................................. 13 14 INA223EVM Software Interface 15 16 17 18 19 20 21 22 23 24 ......................................................................................... Communication Error with SM-USB-DIG Platform .................................................................... Setting the A0 Address ................................................................................................... Configuring the Output Mode ............................................................................................ Configuring the Bus Voltage Gain ....................................................................................... Configuring the Current Shunt Voltage Gain .......................................................................... Register Table ............................................................................................................. Auto-Write, Power, and Voltage Controls .............................................................................. Example Hardware Calculator ........................................................................................... INA223EVM Board Schematic ........................................................................................... INA223EVM PCB Component Layout .................................................................................. 14 14 15 16 18 18 19 20 21 23 24 List of Tables 2 1 Related Documentation .................................................................................................... 4 2 INA223EVM H1 Pin Connections ......................................................................................... 5 3 INA223 Test Board Jumper Functions ................................................................................... 9 4 INA223 I2C Address Configuration ...................................................................................... 15 5 Power Gain Values ........................................................................................................ 17 6 Bill of Materials ............................................................................................................ INA223EVM User’s Guide and Software Tutorial Copyright © 2012, Texas Instruments Incorporated 22 SBOU125 – June 2012 Submit Documentation Feedback Overview www.ti.com 1 Overview The INA223 is a voltage output device that monitors current, bus voltage, and power of a supply line by sensing a voltage drop across a shunt. The INA223EVM is a platform for evaluating the performance of the INA223 under various signal, shunt, and supply conditions. This document gives a general overview of the INA223EVM, and provides a general description of the features and functions to be considered while using this evaluation module. 1.1 INA223EVM Kit Contents The INA223EVM kit includes the following items: • (1) INA223 PCB evaluation board • (1) SM-USB-DIG Platform PCB • (1) USB extender cable • (1) SM-USB-DIG connector ribbon cable • (1) User’s guide CD-ROM Figure 1 shows all of the included hardware. Contact the Texas Instruments Product Information Center nearest you 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 versions of the related software. USB Extender Cable SM-USB-DIG Connector Ribbon Cable INA223EVM Board SM-USB-DIG Figure 1. Hardware Included with INA223EVM Kit SBOU125 – June 2012 Submit Documentation Feedback INA223EVM User’s Guide and Software Tutorial Copyright © 2012, Texas Instruments Incorporated 3 INA223EVM Hardware Setup 1.2 www.ti.com Related Documentation The following document provides information regarding Texas Instruments integrated circuits used in the assembly of the INA223EVM. This user's guide is available from the TI web site under literature number SBOU125 . 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 (800) 477-8924 or the Product Information Center at (972) 644-5580. When ordering, identify the document by both title and literature number. Table 1. Related Documentation Document 2 Literature Number INA223 Product Data Sheet SBOS528 SM-USB-DIG Platform User’s Guide SBOU098 INA223EVM Hardware Setup This section discusses the overall system setup for the INA223EVM. A PC runs software that communicates with the SM-USB-DIG Platform. This platform generates the analog and digital signals used to communicate with the INA223 board. Connectors on the INA223 allow the user to connect to the system under test conditions where the power, current, and voltage are monitored. Analog Supply PC Power Supply USB SM-DIG INA223EVM Shunt Load GND Figure 2. Hardware Setup 4 INA223EVM User’s Guide and Software Tutorial Copyright © 2012, Texas Instruments Incorporated SBOU125 – June 2012 Submit Documentation Feedback INA223EVM Hardware Setup www.ti.com 2.1 Theory of Operation for INA223 Hardware A block diagram of the INA223 test-board hardware setup is shown in Figure 3. The PCB provides connections to the I2C™ and general-purpose inputs and outputs (GPIO) on the SM-USB-DIG Platform board. It also provides connection points for external connections to the shunt voltage. Shunt Terminal 10-Pin SM-DIG Connector T2 Supply Voltage 2 A0 Vs Vdut H1 INA223 JMP1/JMP2 I2C Addr Jumper I2C Interface Figure 3. INA223 Test Board Block Diagram 2.2 Signal Definitions of H1 (10-Pin Male Connector Socket) Table 2 shows the pinout for the 10-pin connector socket used to communicate between the INA223EVM and the SM-USB-DIG. It should be noted that to issue commands to the INA223 chip, the INA223EVM only uses H1 connnector pins 1 and 3 (I2C communication lines), pin 6 (VDUT), and pin 8 (GND). Table 2. INA223EVM H1 Pin Connections Pin on H1 Signal 1 I2C_SCL 2 CTRL/MEAS4 (1) 3 I2C_SDA1 4 (1) (2) Description CTRL/MEAS5 I2C clock signal (SCL) GPIO—Control output or measure input I2C data signal (SDA) (1) 5 SPI_DOUT3 (1) 6 VDUT 7 SPI_CLK (1) 8 GND GPIO—Control output or measure input SPI™ data output (MOSI) Switchable DUT power supply: +3.3V, +5V, Hi-Z (disconnected). (2) SPI clock signal (SCLK) Power return (GND) (1) 9 SPI_CS1 10 SPI_DIN1 (1) SPI chip select signal (CS) SPI data input (MISO) This signal is not used on the INA223EVM. When VDUT is Hi-Z, all digital inputs and outputs (I/O) are Hi-Z as well. SBOU125 – June 2012 Submit Documentation Feedback INA223EVM User’s Guide and Software Tutorial Copyright © 2012, Texas Instruments Incorporated 5 INA223EVM Hardware Setup 2.3 www.ti.com Theory of Operation for SM-USB-DIG Platform SM-USB-DIG 3.3-V Regulator USB +5.0 V +3.3 V USB Bus from Computer TUSB3210 8052 Microcontroller w/USB Interface and UART Power-On Reset Buffer and Level Translators I2C SPI Control Bits Measure Bits To Test Board To Computer and Power Supplies Figure 4 shows the block diagram for the SM-USB-DIG 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 (SBOU098). The block diagram shown in Figure 4 is given as a brief overview of the SM-USB-DIG Platform. 8K ´ 8 Byte EEPROM USB +5.0 V +3.3 V Power Switching VDUT (Hi-Z, 3.3 V, or 5 V) Switched Power Figure 4. SM-USB-DIG Platform Block Diagram The brain of the SM-USB-DIG Platform is the TUSB3210, an 8052 microcontroller that has a built-in USB interface. The microcontroller receives information from the host computer that is interpreted into power, I2C, SPI, and other digital I/O patterns. During the digital I/O transaction, the microcontroller reads the response of any device connected to the I/O interface. The response from the device is sent back to the PC where it is interpreted by the host computer. 6 INA223EVM User’s Guide and Software Tutorial Copyright © 2012, Texas Instruments Incorporated SBOU125 – June 2012 Submit Documentation Feedback INA223EVM Hardware Overview www.ti.com 3 INA223EVM Hardware Overview The INA223EVM hardware setup involves connecting the two EVM PCBs together, applying power, connecting the USB cable, and setting the jumpers. This section describes the details of this procedure. 3.1 Electrostatic Discharge Warning Many of the components on the INA223EVM 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. 3.2 Connecting the Hardware To connect the INA223 test board and the SM-USB-DIG Platform together, gently slide the male and female ends of the 10-pin connectors together. Make sure that the two connectors are completely pushed together; loose connections may cause intermittent operation. 3.3 Connecting Power After the EVM and SM-USB-DIG are joined, as shown in Figure 5, connect the desired VBUS and shunt configuration to be measured. Typically, setup involves a high- or low-side load and a shunt resistor across VIN+ and VIN–. The example in Figure 5 represents a test scenario with a low-side shunt attached. The power supply for VBUS is not included with the kit and is supplied by the customer; the specific voltage needed depends on your testing needs. Figure 5. Typical Hardware Test Connections on the INA223EVM SBOU125 – June 2012 Submit Documentation Feedback INA223EVM User’s Guide and Software Tutorial Copyright © 2012, Texas Instruments Incorporated 7 INA223EVM Hardware Overview 3.4 www.ti.com Connecting the USB Cable to the SM-USB-DIG Platform Figure 6 shows the USB connection to the SM-USB-DIG Platform board. The first time you connect to the PC, the computer typically responds with a Found New Hardware, USB Device pop-up window. The popup window then likely changes to Found New Hardware, USB Human Interface Device. The SM-USB-DIG Platform uses the human interface device drivers that are part of with Microsoft® Windows® operating systems. Figure 6. Connecting the USB Cable to the SM-USB-DIG Platform In some cases, the Windows Add Hardware Wizard is shown. If this prompt appears, allow the system device manager to install the human interface drivers by clicking Yes when requested to install drivers. Windows confirms installation of the drivers with the message shown in Figure 7. This pop-up indicates that the device is ready to be used. Figure 7. Confirmation of SM-USB-DIG Platform Driver Installation 8 INA223EVM User’s Guide and Software Tutorial Copyright © 2012, Texas Instruments Incorporated SBOU125 – June 2012 Submit Documentation Feedback INA223EVM Hardware Overview www.ti.com 3.5 INA223EVM Default Jumper Settings Figure 8 shows the default jumper configuration for the INA223EVM. You may want to change some of the jumpers on the INA223EVM to match your specific configuration. For example, you may wish to set a specific I2C address by configuring jumper 1 (JMP1) and jumper 2 (JMP2). Figure 8. INA223EVM Default Jumpers Jumper 3 (JMP3) on the INA223EVM is typically set to the internal (INT) position. When set to the INT position, the device supply voltage is generated and controlled from the SM-USB-DIG Platform. When this jumper is set to the external (EXT) position, INA223 pin 4 (VS) connects to terminal strip T1 and can be powered from an external supply. JMP1 and JMP2 control the I2C address pin for the INA223; these jumpers set the address for A0 to either high, low, SCL, or SDA. Make sure to connect only one jumper at a time for the address control (for example, if JMP1 is connected, do not connect JMP2, and vice versa). Failure to properly connect jumpers can cause shorts or interruptions in the communication lines. For more information on the INA223 addressing, consult the INA223 data sheet (SBOS528). Table 3 summarizes the function of the INA223 test board jumpers. For most applications, all the jumpers should be left in their default configurations. Table 3. INA223 Test Board Jumper Functions Jumper Default Description JMP1 Open JMP2 GND These jumpers select the I2C AO address selection for A0. Four separate I2C addresses can be selected,depending on whether JMP2 is set to high or low, or JMP1 is set to SDA or SCL. JMP3 INT SBOU125 – June 2012 Submit Documentation Feedback This jumper selects whether the VS pin on the INA223 is connected to the digital power-supply signal (VDUT) generated from the SM-USBDIG Platform (INT position), or whether the VDUT pin is connected to terminal T1, thus allowing for an external supply to power the digital circuitry (EXT position). INA223EVM User’s Guide and Software Tutorial Copyright © 2012, Texas Instruments Incorporated 9 INA223EVM Hardware Overview 3.6 www.ti.com INA223EVM Hardware This section describes some of the hardware features present on the INA223EVM board. 3.6.1 JMP3: I2C versus Control Setting The JMP3 setting determines if the INA223 is powered from the SM-USB-DIG platform or an external power supply. If JMP3 is set to the INT position, the VS pin is connected to the switchable VDUT signal generated from the SM-USB-DIG Platform. This voltage can be set to either 3.3 V or 5 V, depending on how it is configured in the software. When JMP3 is set to the EXT position, an external supply connected to terminal T1 must be used to provide the digital supply voltage for the INA223. 3.6.2 JMP1 and JMP2: I2C Address Hardware Setting (A0) JMP1 and JMP2 are used to set the hardware setting for the A0 I2C address pin on the INA223. Using JMP2, the A0 address can be set to either a logic '1' or a logic '0'. Using JMP1, the A0 address can be set to either the SCL or SDA communication line. Make sure to only have a jumper installed on JMP1 or JMP2. Failure to keep these lines separate can lead to board shorts and problems with the I2C communication lines. See the I2C Address Selection section for how to configure the INA223EVM software to match the JMP1 and JMP2 hardware settings. 3.6.3 External I2C lines and Terminal Block T3 The I2C communication lines on the INA223EVM are tied to two sources: The internal I2C communication lines from the SM-USB-DIG Platform and terminal block T3. If external signals separate from the SM-USBDIG are to be used, simply disconnect the SM-USB-DIG from the INA223 board and connect to external SDA, SCL, and GND lines. Also, remember to apply an external VS that is compatible with the I2C communication device being used. CAUTION Failure to disconnect the SM-USB-DIG Platform while using external I2C communication can cause damage to the SM-USB-DIG or external communication device. 10 INA223EVM User’s Guide and Software Tutorial Copyright © 2012, Texas Instruments Incorporated SBOU125 – June 2012 Submit Documentation Feedback INA223EVM Hardware Overview www.ti.com 3.6.4 VIN+ and VIN– Input Filter (R4, R3, and C3) The INA223EVM has an optional input filter located between the terminal block T2 and the INA223 input pins. This filter helps to remove high-frequency noise from the VIN+ and VIN– inputs. The EVM ships with this filter not used. C3 is typically unpopulated and R3 and R4 have 0-Ω resistors installed. If filtering is desired, limit the value for R3 and R4 to 10-Ω or less. Figure 9 shows the typical setup that is recommended for basic INA223 evaluation. See the INA223 data sheet (SBOS528) for more details. 0 W Resistors Unpopulated C3 Figure 9. Typical Filter Setup 3.6.5 Shunt Monitor Configuration and Terminal Block T2 The INA223 is typically used in a high-side configuration, as shown in Figure 10. The T2 terminal block includes the connections for VIN+ and VIN–, which should be connected directly across the shunt resistor. Depending on the user’s needs, either of these configurations may be used without any changes needed to the INA223EVM board or software. Power Supply (0V to 26V) CBYPASS 0.1mF RSHUNT Load VS (Supply Voltage) Attenuator RPULLUP 4.7kW VIN- VOUT SCL VIN+ Two-Wire Interface SDA A0 INA223 GND Figure 10. INA223 Shunt Configurations SBOU125 – June 2012 Submit Documentation Feedback INA223EVM User’s Guide and Software Tutorial Copyright © 2012, Texas Instruments Incorporated 11 INA223EVM Software Setup 4 www.ti.com INA223EVM Software Setup This section discusses how to install the INA223 software. 4.1 Operating Systems for INA223EVM Software The INA223 software has been tested on the Microsoft Windows XP operating system (OS) with United States and European regional settings. This software should also function on other Windows operating systems. 4.2 INA223 Software Installation The INA223EVM software is included on the CD that is shipped with the EVM kit. It is also available through the INA223EVM product folder on the TI web site. To download the software to your system, insert the disc into an available CD-ROM drive. Navigate to the drive contents and open the INA223EVM software folder. Locate the compressed file (INA223EVM.zip) and open it. Extract the INA223EVM files into a folder labeled INA223EVM (for example, C:\INA223EVM) on your hard drive. After the files are extracted, navigate to the INA223EVM folder you created on your hard drive. Locate the setup.exe file and run it to start the installation. The INA223 software installer file opens to begin the installation process, as shown in Figure 11. Figure 11. Software Install Window 12 INA223EVM User’s Guide and Software Tutorial Copyright © 2012, Texas Instruments Incorporated SBOU125 – June 2012 Submit Documentation Feedback INA223EVM Software Setup www.ti.com After the install begins, the user is given the choice of selecting the directory to install the program, usually defaulting to C:\Program Files\INA223\ and C:\Program Files\National Instruments\. Following this option, two license agreements are presented that must be accepted, as shown in Figure 12. Figure 12. Software License Agreement After accepting the Texas Instruments and National Instruments license agreements, the progress bar opens and shows the installation of the software, as shown in Figure 13. After the installation process is complete, click Finish. Figure 13. Software Install Progress SBOU125 – June 2012 Submit Documentation Feedback INA223EVM User’s Guide and Software Tutorial Copyright © 2012, Texas Instruments Incorporated 13 INA223EVM Software Overview 5 www.ti.com INA223EVM Software Overview This section describes how to use the INA223EVM software. The software operation contains a two-step process: configuration and operation. 5.1 Starting the INA223EVM Software To start the INA223 software, go to the Windows Start menu, select All Programs, and then select the INA223EVM program. Figure 14 illustrates how the software should appear if the INA223EVM is functioning properly. Figure 14. INA223EVM Software Interface Figure 15 shows the error that appears if the computer cannot communicate with the EVM. In the event you receive this error, first ensure that the USB cable is properly connected on both ends. This error can also occur if you connect the USB cable to your PC before the SM-USB-DIG Platform is connected to the EVM board. Another possible source for this error is a problem with the computer USB human interface device driver. Make sure that the device is recognized when the USB cable is plugged in, indicated by a Windows-generated confirmation sound. Figure 15. Communication Error with SM-USB-DIG Platform 14 INA223EVM User’s Guide and Software Tutorial Copyright © 2012, Texas Instruments Incorporated SBOU125 – June 2012 Submit Documentation Feedback INA223EVM Software Overview www.ti.com 5.2 Configuring the INA223 Software The next steps of this user’s guide describes how to configure the software and hardware for different configurations. 5.2.1 I2C Address Selection The INA223 has a flexible I2C address configuration that allows for multiple devices to be on the same I2C lines. By moving the A0 address on jumpers JMP1 and JMP2 to either GND, VS, SDA or SCL, the INA223 can be changed to four different I2C addresses, as shown in Table 4. Table 4. INA223 I2C Address Configuration A0 Address GND 1000000 VS 1000001 SDA 1000010 SCL 1000011 Figure 16 shows how to configure the I2C addresses. Click on the I2C Address Select button (shown in the red box) to select how the hardware is configured on the EVM. If the correct address is not selected, the INA223 cannot communicate with the software. Figure 16. Setting the A0 Address SBOU125 – June 2012 Submit Documentation Feedback INA223EVM User’s Guide and Software Tutorial Copyright © 2012, Texas Instruments Incorporated 15 INA223EVM Software Overview 5.2.2 www.ti.com Output Mode The output mode configuration allows the user to toggle between different output signals generated from the INA223, and is shown in the red box of Figure 17. The four options available for output mode are: Shunt Voltage, Bus Voltage, Supply Power, and Load Power. Figure 17. Configuring the Output Mode The two power output modes of the INA223EVM is used to select whether the signal representing the power being supplied by the power supply or the power being consumed by the load is made available at the output pin. When the Supply Power option is selected, the VBUS measurement is taken internally at the VIN+ pin of the INA223 and combined with the VSHUNT measurement to calculate the power being supplied. The Load Power option operates in a similar manner to the Supply Power option, except that the VBUS measurement is taken internally at the VIN– pin of the INA223. The power being consumeed by the load is found by taking the VBUS measurement from the VIN– pin. The Supply Power and Load Power results are very similar with the exception being that the Load Power option removes the power being dissipated across the shunt resistor from the result. At high current shunt gains, the differences between Load Power and Supply Power are negligible. At low current shunt gains, the power dissipated across the sense resistor can result in a noticeable difference between these two results. 16 INA223EVM User’s Guide and Software Tutorial Copyright © 2012, Texas Instruments Incorporated SBOU125 – June 2012 Submit Documentation Feedback INA223EVM Software Overview www.ti.com It is important to note that valid bus voltage and shunt voltage measurements must be within the linear range of the device in order for the INA223 to correctly calculate power using Equation 1. POWER = VOUT / PowerGAIN × RSHUNT (1) Where VOUT is calculated based on Equation 2: VOUT = VCM × VSENSE × PowerGAIN (2) and PowerGAIN valuse are shown in Table 5. Table 5. Power Gain Values Bus Voltage Gain Shunt Voltage Gain PowerGAIN 1/10 20 0.667 1/10 128 4.267 1/10 300 10 1/5 20 1.333 1/5 128 8.533 1/5 300 20 2/5 20 2.667 2/5 128 17.067 2/5 300 40 The remaining two configurations, Bus Voltage and Shunt Voltage, measure the bus voltages at the VINpin and the shunt voltage developed directly across the shunt resistor, respectively. The actual output voltage of either measurement is based on the input voltage multiplied by the corresponding gain settings, as shown in sections Section 5.2.3 and Section 5.2.4. NOTE: For maximum accuracy, select a gain that gives a full-scale voltage, just below the maximum output voltage. SBOU125 – June 2012 Submit Documentation Feedback INA223EVM User’s Guide and Software Tutorial Copyright © 2012, Texas Instruments Incorporated 17 INA223EVM Software Overview 5.2.3 www.ti.com Bus Voltage Gain The Bus Voltage Gain field allows the user to select the gain that the bus voltage is multiplied by. It is important to choose a value that places the output voltage within the linear output range of the device. Failure to ensure that the outputs are within the linear range of the device can result in inaccurate results. Figure 18. Configuring the Bus Voltage Gain 5.2.4 Current Shunt Voltage Gain The Current Shunt Voltage Gain field is used to select the device shunt voltage gain setting. It is important to choose a value that places the output voltage within the linear output range of the device. Failure to ensure that the outputs are within the linear range of the device can result in inaccurate results. Figure 19. Configuring the Current Shunt Voltage Gain 18 INA223EVM User’s Guide and Software Tutorial Copyright © 2012, Texas Instruments Incorporated SBOU125 – June 2012 Submit Documentation Feedback INA223EVM Software Overview www.ti.com 5.3 5.3.1 Using the INA223 Software Register Table The register table (shown by the red box in Figure 20) contains information on the internal registers of the INA223 registers. Each register can be changed on a bit-by-bit basis to allow the user to have total control of the part, outside the general functionality of the graphical user interface (GUI). Most of this functionality is displayed in the Configuration Register; however, by selecting the appropriate register and clicking on the Help w Reg button (shown in Figure 20), the individual use of each bit in each register can be diagnosed. Figure 20. Register Table SBOU125 – June 2012 Submit Documentation Feedback INA223EVM User’s Guide and Software Tutorial Copyright © 2012, Texas Instruments Incorporated 19 INA223EVM Software Overview 5.3.2 www.ti.com Auto-Write and DVDD Voltage The INA223EVM software allows for customization of the board level voltage, regulated by the SM-USBDIG. Select either +3.3V or +5V for the operating voltage of the chip, as shown in the upper red box in Figure 21. Figure 21. Auto-Write, Power, and Voltage Controls The software also includes an Auto-Write feature (as shown in the lower red box in Figure 21). Auto-Write is enabled by default, and automatically updates the register table whenever a change is made. When this feature is enabled, the Write all Reg button serves little purpose, and is only used as an alternative for when this button is disabled. 20 INA223EVM User’s Guide and Software Tutorial Copyright © 2012, Texas Instruments Incorporated SBOU125 – June 2012 Submit Documentation Feedback INA223EVM Software Overview www.ti.com 5.3.3 Example Hardware Calculator The Example Hardware Calculator tab allows the user to simulate the analog results of the INA223EVM. By adjusting the controls on this page, and entering inputs for Vin+ (V), Vin- (V), and Rshunt, the approximate values for Vout (V) and Power (W) can be estimated. Note that the appropriate output mode must be selected to ensure accurate results, and that no limitations of the device are violated in the Error field. This calculator is used to help ensure that the physical output and settings are operating correctly. The EVM and device digital communication interface are only designed to configure the device settings. There is no analog readback available with this EVM. This means that the output voltages shown on this calculator tab in the software are calculated results based on the parameters entered and not representative of the measurements of the actual device. Figure 22. Example Hardware Calculator SBOU125 – June 2012 Submit Documentation Feedback INA223EVM User’s Guide and Software Tutorial Copyright © 2012, Texas Instruments Incorporated 21 INA223EVM Documentation 6 www.ti.com INA223EVM Documentation This section contains the complete bill of materials, schematic diagram, and PCB layout for the INA223EVM. Documentation information for the SM-USB-DIG Platform can be found in the SM-USB-DIG Platform User’s Guide (SBOU058), available at the TI web site at http://www.ti.com. 6.1 Bill of Materials Table 6 lists the bill of materials for the INA223 Test Board. Table 6. Bill of Materials 22 Digikey Part Number Manufacturer Manufacturer Part Number Ref Des Description R1, R2 RES 10K OHM 1/10W 5% 0603 SMD Stackpole Electronics RMCF0603JT10K0CT-ND RMCF0603JT10K0 R5 RES 300 OHM 1/10W 5% 0603 SMD Panasonic P300GCT-ND ERJ-3GEYJ301V R3, R4 RES 0.0 OHM 1/10W 0603 SMD Stackpole Electronics RMCF0603ZT0R00CT-ND RMCF0603ZT0R00 C2 CAP TANTALUM 4.7UF 35V 10% SM AVX Corp 478-1717-1-ND TAJC475K035RNJ C3, C4 CAP CER .10UF 25V X7R 10% 0603 TDK Corp 445-1316-1-ND C1608X7R1E104K D1 LED GREEN WIDE ANGLE 0603 SMD Panasonic P14140CT-ND LNJ3W0C83RA U1 INA223 Samtec SAM1029-50-ND TSW-150-07-G-S Keystone Electronics 5016KCT-ND 5016 Texas Instruments Jumpers All CONN HEADER 50POS .100" SGL GOLD Test Points All PC TEST POINT COMPACT SMT T3 3Block Terminal 3.5mm On Shore Technology Inc ED2636-ND OSTTE030161 T1, T2 2Block Terminal 3.5mm On Shore Technology Inc ED1514-ND ED555/2DS Bumpons BUMPON .50X.14 BLACK 3M SJ5012-0-ND SJ-5012 (BLACK) H1 CONN SOCKET RT ANG 1POS .050 Mill-Max Manufacturing ED8850-ND 851-93-10-20-001000 INA223EVM User’s Guide and Software Tutorial Copyright © 2012, Texas Instruments Incorporated SBOU125 – June 2012 Submit Documentation Feedback INA223EVM Documentation www.ti.com 6.2 Schematic Figure 23 shows the schematic for the INA223EVM board. , ' / 0 + * 1 ' ( ; = $ 7 $ 8 6 '' # 0&' 0#&' 8 6 # ( 7 $ ) ( 8 7- *-. ) ; 3 3 45 # 22 3 4 6 7 ( $ ; = $ # 0&' 0#&' ! =; & $$ 6 6 8 8 7 # $ ( * + 7 8 9 : . , 7 $ 0&' 0#&' ( ( $ $ ! =; & $$ ; 6 * $