User's Guide SBOU124 – March 2012 INA230EVM Evaluation Board and Software Tutorial This user's guide describes the characteristics, operation, and use of the INA230EVM evaluation board. It discusses how to set up and configure the software and hardware, and reviews various aspects of the program operation. Throughout this document, the terms evaluation board, evaluation module, and EVM are synonymous with the INA230EVM. 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. 1 2 3 4 5 6 Contents Overview ..................................................................................................................... 3 INA230EVM Hardware Setup ............................................................................................. 4 INA230EVM Hardware ..................................................................................................... 6 INA230EVM Software Setup ............................................................................................. 12 INA230EVM Software Overview ......................................................................................... 15 INA230EVM Documentation ............................................................................................. 23 List of Figures 1 Hardware Included with INA230EVM Kit................................................................................. 3 2 INA230EVM Hardware Setup ............................................................................................. 4 3 INA230EVM Test Board Block Diagram ................................................................................. 4 4 SM-USB-DIG Platform Block Diagram ................................................................................... 5 5 Typical Hardware Test Connections for the INA230EVM 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 ............................................................. Connecting the USB Cable to the SM-USB-DIG Platform............................................................. Confirmation of SM-USB-DIG Platform Driver Installation............................................................. INA230EVM Default Jumper Settings .................................................................................... Typical Filter Setup ........................................................................................................ INA230 Shunt Configurations ............................................................................................ INA230EVM Software Installation ....................................................................................... INA230EVM License Agreements ....................................................................................... INA230EVM Software Installation Progress ........................................................................... INA230EVM Software Interface ......................................................................................... INA230EVM Software: Communication Error with the SM-USB-DIG Platform.................................... Setting the A1 Address ................................................................................................... Configuring Operating Mode ............................................................................................. Configuring Conversion Times........................................................................................... Setting the Configuration Register (Calibration Register) ............................................................ Setting the Configuration Register (Current LSB) ..................................................................... Configuring the Alert Pin.................................................................................................. INA230 Results Bar ....................................................................................................... Theory of Operation Flowchart on the Calculation Tab .............................................................. Registers Tab .............................................................................................................. 7 8 8 9 11 11 12 13 14 15 16 17 18 18 19 19 19 20 20 21 Microsoft, Windows are registered trademarks of Microsoft Corporation. I2C is a trademark of NXP Semiconductors. WinZIP is a registered trademark of WinZip International LLC. All other trademarks are the property of their respective owners. SBOU124 – March 2012 Submit Documentation Feedback INA230EVM Evaluation Board and Software Tutorial Copyright © 2012, Texas Instruments Incorporated 1 www.ti.com 25 Graphing the INA230 Data ............................................................................................... 22 26 Auto-Write, Power Button, and Voltage Control ....................................................................... 22 27 INA230EVM Schematic ................................................................................................... 23 28 INA230EVM PCB Top Layer (Component Side) ...................................................................... 24 List of Tables 2 1 INA230EVM Kit Contents .................................................................................................. 3 2 Related Documentation .................................................................................................... 4 3 Signal Definition of J1 on INA230EVM Board ........................................................................... 5 4 INA230EVM Test Board Jumper Functions ............................................................................. 9 5 INA230 I2C Address Configuration ...................................................................................... 16 6 Bill of Materials: INA230EVM ........................................................................................... INA230EVM Evaluation Board and Software Tutorial Copyright © 2012, Texas Instruments Incorporated 25 SBOU124 – March 2012 Submit Documentation Feedback Overview www.ti.com 1 Overview The INA230 is a high-side current sensor and power monitor with an I2C™ interface. The INA230 monitors both current and supply voltage, with programmable conversion times and averaging modes. The INA230EVM is a platform for evaluating the performance of the INA230 under various signal, shunt, and supply conditions. This document gives a general overview of the INA230EVM, and provides a general description of the features and functions to be considered while using this evaluation module. 1.1 INA230EVM Kit Contents Table 1 summarizes the contents of the INA230EVM kit. 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 also check the INA230 product folder on the TI web site at www.ti.com to verify that you have the latest versions of the related software. Table 1. INA230EVM Kit Contents Item Quantity INA230EVM PCB Test Board 1 SM-USB-DIG Platform PCB 1 USB Extender Cable 1 SM-Dig Connector Ribbon Cable 1 User’s Guide CD-ROM 1 INA230EVM Board USB SM-DIG SM-DIG Connector Ribbon Cable USB Extender Cable Figure 1. Hardware Included with INA230EVM Kit SBOU124 – March 2012 Submit Documentation Feedback INA230EVM Evaluation Board and Software Tutorial Copyright © 2012, Texas Instruments Incorporated 3 INA230EVM Hardware Setup 1.2 www.ti.com Related Documentation from Texas Instruments The following documents provide information regarding Texas Instruments' integrated circuits used in the assembly of the INA230EVM. This user's guide is available from the TI web site under literature number SBOU124. 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 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 2. Related Documentation Document 2 Literature Number INA230 Product Data Sheet SBOS601 SM-USB-DIG Platform User Guide SBOU098 INA230EVM Hardware Setup INA230EVM USB SM-DIG Shunt PC Figure 2 shows the overall system setup for the INA230EVM. The PC runs software that communicates with the SM-USB-DIG Platform. The SM-USB-DIG Platform generates the analog and digital signals used to communicate with the INA230 test board. Connectors on the INA230EVM test board allow the user to connect to the system under test conditions to monitor the power, current, and voltage. Figure 2. INA230EVM Hardware Setup 2.1 Theory of Operation for INA230 Hardware A block diagram of the INA230 test board hardware setup is shown in Figure 3. The PCB provides connections to the I2C interface and general-purpose inputs/outputs (GPIOs) on the SM-USB-DIG Platform board. The PCB also provides connection points for external connections of the shunt voltage, bus voltage, and ground. Shunt Terminals 10-Pin SM-DIG Connector T3, T4 Vdut Supply (DVDD) 4 J3, J4 A0 J1 INA230 2 I C Address Jumpers A1 2 I C Interface J5, J6 Figure 3. INA230EVM Test Board Block Diagram 4 INA230EVM Evaluation Board and Software Tutorial Copyright © 2012, Texas Instruments Incorporated SBOU124 – March 2012 Submit Documentation Feedback INA230EVM Hardware Setup www.ti.com 2.2 Signal Definitions of H1 (10-Pin Male Connector Socket) Table 3 lists the pinout for the 10-pin connector socket used to communicate between the INA230EVM and the SM-USB-DIG. It should be noted that the INA230EVM only uses the necessary I2C communication lines (pins 1 and 3) and the VDUT and GND pins (pin 6 and pin 8) to issue commands to the INA230 chip. Table 3. Signal Definition of J1 on INA230EVM Board (1) 2.2.1 Pin on J1 Signal Description 1 I2C_SCL I2C Clock Signal (SCL) 2 CTRL/MEAS4 GPIO: Control Output or Measure Input 3 I2C_SDA1 I2C Data Signal (SDA) 4 CTRL/MEAS5 GPIO: Control Output or Measure Input 5 SPI_DOUT1 SPI Data Output (MOSI) 6 VDUT Switchable DUT Power Supply: +3.3 V, +5 V, Hi-Z (Disconnected) (1) 7 SPI_CLK SPI Clock Signal (SCLK) 8 GND Power Return (GND) 9 SPI_CS1 SPI Chip Select Signal (CS) 10 SPI_DIN1 SPI Data Input (MISO) When VDUT is Hi-Z, all digital I/O are Hi-Z as well. Theory of Operation for SM-USB-DIG Platform 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 (available for download at www.ti.com). The block diagram shown in Figure 4 gives a brief overview of the platform. The primary control device on the SM-USB-DIG Platform is the TUSB3210. The TUSB3210 is an 8052 microcontroller that has an onboard USB interface. The microcontroller receives information from the host computer that it interprets 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. SM-USB-DIG 3.3-V Regulator USB +5.0 V To Computer and Power Supplies +3.3 V TUSB32108052 Microcontroller with USB Interface and UART USB Bus from Computer Power-On Reset 2 Buffers and Level Translators IC SPI Control Bits Measure Bits To Test Board 8-K ´ 8-Byte EEPROM USB +5.0 V +3.3 V Power Switching Vdut (Hi-Z, 3.3V or 5V) Switched Power Figure 4. SM-USB-DIG Platform Block Diagram SBOU124 – March 2012 Submit Documentation Feedback INA230EVM Evaluation Board and Software Tutorial Copyright © 2012, Texas Instruments Incorporated 5 INA230EVM Hardware 3 www.ti.com INA230EVM Hardware Setting up the INA230EVM hardware involves connecting the two PCBs of the EVM together, applying power, connecting the USB cable, and setting the jumpers. This section presents the details of this procedure. 3.1 Electrostatic Discharge Warning CAUTION Many of the components on the INA230EVM 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 set up the INA230EVM and connect the two PCBs of the EVM together (that is, the INA230 Test Board and SM-USB-DIG Platform board), 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. 6 INA230EVM Evaluation Board and Software Tutorial Copyright © 2012, Texas Instruments Incorporated SBOU124 – March 2012 Submit Documentation Feedback INA230EVM Hardware www.ti.com 3.3 Connecting Power After the EVM and SM-USB-DIG are conjoined, as Figure 5 illustrates, connect the desired VBUS and shunt configuration intended to be measured. Typically, setup involves a high- or low-side load and a shunt resistor across VIN+ and VIN–. The setup in Figure 5 represents a test scenario with a low-side shunt attached. This source for VBUS is not included with the kit, and its voltage may differ depending on your testing needs. The external power source is connected to the terminal strip T3. NOTE: It is always necessary to connect the power to the SM-USB-DIG Platform board before connecting the USB cable. Figure 5. Typical Hardware Test Connections for the INA230EVM SBOU124 – March 2012 Submit Documentation Feedback INA230EVM Evaluation Board and Software Tutorial Copyright © 2012, Texas Instruments Incorporated 7 INA230EVM Hardware 3.4 www.ti.com Connecting the USB Cable to the SM-USB-DIG Platform Once power is connected, as shown in Figure 6, the computer typically responds with a Found New Hardware, USB Device pop-up dialog. The pop-up window typically changes to Found New Hardware, USB Human Interface Device. This pop-up indicates that the device is ready to be used. The SM-USBDIG Platform uses the human interface device drivers that are part of the Microsoft® Windows® operating system. Figure 6. Connecting the USB Cable to the SM-USB-DIG Platform In some cases, the Windows Add Hardware Wizard may pop up. If this prompt appears, allow the system device manager to install the human interface drivers by clicking Yes when requested to install drivers. Windows then confirms installation of the drivers with the message shown in Figure 7. Figure 7. Confirmation of SM-USB-DIG Platform Driver Installation 8 INA230EVM Evaluation Board and Software Tutorial Copyright © 2012, Texas Instruments Incorporated SBOU124 – March 2012 Submit Documentation Feedback INA230EVM Hardware www.ti.com 3.5 INA230EVM Default Jumper Settings Figure 8 shows the default jumper configuration for the INA230EVM. In general, the jumper settings of the SM-USB-DIG Platform do not need to be changed. You may want to change some of the jumpers on the INA230EVM board to match your specific configuration. For example, you may wish to set a specific I2C address by configuring J3-J6. Figure 8. INA230EVM Default Jumper Settings Typically, jumper 2 on the INA230EVM is always set to the INT position. When set to the INT position, the SM-USB-DIG Platform provides the supply for the INA230. When this jumper is set to the EXT position, an external supply voltage can be connected to terminal strip T2 to provide the supply for the INA230. Jumpers 3 through 6 control the I2C address pins for the INA230. These jumpers can set the address for A0 and A1 to either supply, ground, SCL, or SDA. Make sure to only connect one jumper at a time for each address control. Failure to properly connect jumpers can cause shorts or interruptions in the communication lines. For more information on the INA230 addressing, refer to the INA230 product data sheet. Table 4 summarizes the function of the INA230 Test Board jumpers. For most applications, all jumpers should be left in the respective default configurations. Table 4. INA230EVM Test Board Jumper Functions Jumper Default Purpose J2 INT This jumper selects whether the VS pin on the INA230 is connected to the VDUT signal generated from the SM-USB-DIG Platform or whether the digital supply pin is connected to terminal T2, allowing for an external supply to power the device. The default INT position connects the VS pin to the VDUT control signal. J3/J4 GND This jumper selects the I2C A0 address selection for A0. J5/J6 GND This jumper selects the I2C A1 address selection for A1. SBOU124 – March 2012 Submit Documentation Feedback INA230EVM Evaluation Board and Software Tutorial Copyright © 2012, Texas Instruments Incorporated 9 INA230EVM Hardware 3.6 www.ti.com INA230EVM Features This section describes some of the hardware features present on the INA230EVM test board. 3.6.1 J2: I2C VS Control Setting Jumper J2 selects what the INA230 supply pin is connected to. If J2 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. While J4 is set in the INT position, the VS Power button in the INA230EVM software is able to control whether the VDUT supply voltage is turned on or off. When J2 is set in the EXT position, an external supply connected to terminal T2 can be used to provide the supply voltage for the INA230. 3.6.2 J3 and J4: I2C Address Hardware Setting (A0) Jumpers J3 and J4 are used to set the hardware setting for the A0 I2C address pin on the INA230. Using J3, the A0 address can be set to either a logic '1' or a logic '0'. Using J4, the A0 address can be set to either the SCL or SDA communication line. Make sure to only have either J3 or J4 connected individually; failure to keep these lines separate can lead to board shorts and problems with the I2C communication lines. See Section 5.2.1 on how to configure the INA230EVM software to match the J3/J4 hardware setting. 3.6.3 J5 and J6: I2C Address Hardware Setting (A1) Jumpers J5 and J6 are used to set the hardware setting for the A1 I2C address pin on the INA230. Using J3, the A1 address can be set to either a logic '1' or a logic '0'. Using J4, the A1 address can be set to either the SCL or SDA communication line. Make sure to only have either J5 or J6 connected individually; failure to keep these lines separate can lead to board shorts and problems with the I2C communication lines. See Section 5.2.1 on how to configure the INA230EVM software to match the J5/J6 hardware setting. 3.6.4 External I2C Lines and Terminal Block T1 The I2C communication lines on the INA230EVM are tied to two sources: the internal I2C communication lines from the SM-USB-DIG and the terminal block T1. If the user wants to add external signals separate from the SM-USB-DIG, simply disconnect the SM-USB-DIG from the INA230EVM board and hook up the necessary SDA, SCL, and GND lines. Also, remember to apply an external supply to the lines that is compatible with the I2C communication device being used. NOTE: Failure to disconnect the SM-USB-DIG while using external I2C communication can cause damage to the SM-USB-DIG or any external communication devices that are connected. 10 INA230EVM Evaluation Board and Software Tutorial Copyright © 2012, Texas Instruments Incorporated SBOU124 – March 2012 Submit Documentation Feedback INA230EVM Hardware www.ti.com 3.6.5 VIN+ and VIN– Input filter (R1, R2, and C1) The INA230EVM has an optional input filter to remove high-frequency noise from the inputs VIN+ and VIN–. This filter is typically unpopulated. The default values for R1 and R2 are 0-Ω resistors. Figure 9 shows the typical setup, which is recommended for basic INA230 evaluation. 0-W Resistors Unpopulated C1 Figure 9. Typical Filter Setup 3.6.6 Shunt Monitor Configuration and Terminal Blocks T3 and T4 The INA230 is generally used in either a high-side or low-side shunt configuration, as shown in Figure 10. Terminal block T3 represents VBUS and ground, while terminal block T4 represents VIN+ and VIN–. Depending on the user’s needs, either of these configurations may be used without making any changes to the INA230EVM board or software. Figure 10. INA230 Shunt Configurations SBOU124 – March 2012 Submit Documentation Feedback INA230EVM Evaluation Board and Software Tutorial Copyright © 2012, Texas Instruments Incorporated 11 INA230EVM Software Setup 4 www.ti.com INA230EVM Software Setup This section discusses how to install the INA230EVM software. 4.1 Operating Systems for the INA230EVM Software The INA230EVM software has been tested on Microsoft® Windows® XP operating systems (OS) with United States and European regional settings. The software should also function on other Windows OS platforms. 4.2 Software Installation The INA230EVM software is included on the CD that is shipped with the EVM kit. It is also available through the INA230EVM product folder on www.ti.com. To install the software to a computer, insert the disc into an available CD-ROM drive. Navigate to the drive contents and open theINA230EVM software folder. Locate the compressed file (INA230EVM.zip) and open it using WinZIP® or a similar file compression program; extract the INA230EVM files into a specific INA230EVM folder (for example, C:\INA230EVM) on your hard drive. Once the files are extracted, navigate to the INA230EVM folder you created on the hard drive. Locate the setup.exe file and execute it to start the installation. The INA230 software installer file then begins the installation process as shown in Figure 11. Figure 11. INA230EVM Software Installation 12 INA230EVM Evaluation Board and Software Tutorial Copyright © 2012, Texas Instruments Incorporated SBOU124 – March 2012 Submit Documentation Feedback INA230EVM Software Setup www.ti.com After the installation process initializes, the user is given the choice of selecting the directory in which to install the program; the default location is C:\Program Files\INA230\ and C:\Program Files\National Instruments\. Following this option, two license agreements are presented that must be accepted, as shown in Figure 12. After accepting the Texas Instruments and National Instruments license agreements, the progress bar opens and shows the installation of the software, as Figure 13 illustrates. Once the installation process is completed, click Finish. Figure 12. INA230EVM License Agreements SBOU124 – March 2012 Submit Documentation Feedback INA230EVM Evaluation Board and Software Tutorial Copyright © 2012, Texas Instruments Incorporated 13 INA230EVM Software Setup www.ti.com Figure 13. INA230EVM Software Installation Progress 14 INA230EVM Evaluation Board and Software Tutorial Copyright © 2012, Texas Instruments Incorporated SBOU124 – March 2012 Submit Documentation Feedback INA230EVM Software Overview www.ti.com 5 INA230EVM Software Overview This section discusses how to use the INA230EVM software. Software operation involves a two-step process: configuration of the INA230 settings, and operation of the tool. 5.1 Starting the INA230EVM Software The INA230 software can be operated through the Windows Start menu. From Start, select All Programs; then select the INA230EVM program. Figure 14 illustrates how the software should appear if the INA230EVM is functioning properly. Figure 14. INA230EVM Software Interface SBOU124 – March 2012 Submit Documentation Feedback INA230EVM Evaluation Board and Software Tutorial Copyright © 2012, Texas Instruments Incorporated 15 INA230EVM Software Overview www.ti.com Figure 15 shows an error that pops up if the computer cannot communicate with the EVM. If you receive this error, first check to see that the USB cable is properly connected on both ends. This error can also occur if you connect the USB cable before the SM-USB-DIG Platform power source. Another possible source for this error is a problem with your PC USB Human Interface Device driver. Make sure that the device is recognized when the USB cable is plugged in; recognition is indicated by a Windows-generated confirmation sound. Figure 15. INA230EVM Software: Communication Error with the SM-USB-DIG Platform 5.2 Configuring the INA230EVM Software The INA230EVM software first requires a series of setup processes to configure the device and ensure that it works properly. On the Configuration tab (see Figure 14), there are six steps noted: Step 1. Set I2C Address Step 2. Configure Operation Step 3. Set Conversion Times Step 4. Select Configuration Method Step 5. Set Configuration Register Step 6. Configure Alert Pin This section explains how to configure the software and reviews some of the different setups that can be done. 5.2.1 I2C Address Selection The INA230 device has a flexible I2C address configuration that allows for multiple devices to be on the same I2C lines. By moving the A0 and A1 addresses on jumpers J3-J6 to either GND, VS, SDA or SCL, the INA230 can be changed to a total of 16 I2C addresses as shown in Table 5. Table 5. INA230 I2C Address Configuration 16 A1 A0 Slave Address GND GND 1000000 GND VS+ 1000001 GND SDA 1000010 GND SCL 1000011 VS+ GND 1000100 VS+ VS+ 1000101 VS+ SDA 1000110 VS+ SCL 1000111 SDA GND 1001000 SDA VS+ 1001001 SDA SDA 1001010 SDA SCL 1001011 SCL GND 1001100 SCL VS+ 1001101 SCL SDA 1001110 SCL SCL 1001111 INA230EVM Evaluation Board and Software Tutorial Copyright © 2012, Texas Instruments Incorporated SBOU124 – March 2012 Submit Documentation Feedback INA230EVM Software Overview www.ti.com Figure 16 illustrates how to configure the I2C addresses. Click on either the A0 or A1 box and select how the hardware is configured on the EVM. Failure to select the correct address prevents the INA230 device from communicating with the software. Figure 16. Setting the A1 Address 5.2.2 Configure Operating Mode The second step of the INA230EVM configuration process allows the user to set the operating mode and the averaging mode. The Operating mode allows the user to restrict the amount of calculations done within the INA230 by changing the conversion to be triggered or continuous, or shutting down the part altogether. When the device is operating in triggered mode, it only performs conversions when the operating mode is set and the Write All Reg button at the top of the screen is selected. After the mode changes and Write All Reg has been selected, the Read All Reg button must also be selected in order for the changes on the device to be reflected in the software. When the INA230 is operating in continuous mode, conversions are performed directly after the previous conversion is completed. When the INA230EVM software is in continuous mode, the software can be updated at any time by pressing the Read All Reg button. Power Down mode stops all conversions from taking place until the operating mode changes again. The device remains attached to power but draws minimal current and does not perform any conversions. SBOU124 – March 2012 Submit Documentation Feedback INA230EVM Evaluation Board and Software Tutorial Copyright © 2012, Texas Instruments Incorporated 17 INA230EVM Software Overview www.ti.com All three operating modes can also be limited to only measuring certain components of the device, as shown in Figure 17. It is important to note that for complete functionality of the INA230, a configuration must be chosen with Shunt and Bus configuration. Failure to choose Shunt and Bus configuration disables a considerable portion of the unit functionality as discussed in the INA230 data sheet. Figure 17. Configuring Operating Mode The Configure Operation step also contains a drop down box for selecting the Averaging Mode. The INA230 can be setup to take the average of several measurements before storing the value of the measurements in the register table. 5.2.3 Set Conversion Times Setting the conversion times allows the user to customize the amount of measurement time for conversions. Typically, for the INA230EVM software, the user is not able to notice a visual difference between the conversion times unless a high averaging mode and conversion time are chosen. The Shunt and Bus conversion times can be set as shown in Figure 18. Figure 18. Configuring Conversion Times 18 INA230EVM Evaluation Board and Software Tutorial Copyright © 2012, Texas Instruments Incorporated SBOU124 – March 2012 Submit Documentation Feedback INA230EVM Software Overview www.ti.com 5.2.4 Set Configuration Register The Configuration Register must then be set correctly for the software to operate properly. There are two methods used to set the Configuration Register: first, the user can manually calculate the desired value and then input that value into the register table, as shown in Equation 1.Alternatively, the user can allow the software to create a recommended window and choose an LSB for the current as shown in Figure 20. Both methods accomplish the same goal by using Equation 1, but the method is selected by changing the value in Step 4: Select Configuration Method (as Figure 19 and Figure 20 show). 0.00512 Calibration Register = CurrentLSB ´ RSHUNT (1) The current LSB is calculated by a recommended range in the INA230 data sheet as shown in Equation 2. It is important to note that with either of the methods used, the Current LSB and the Calibration Register values are calculated based on the other variable and the RSHUNT value. See the section, Programming the INA230 in the product data sheet for more information on setting the Calibration Register value. Max Expected Current Max Expected Current £ CurrentLSB £ 215 212 (2) Figure 19. Setting the Configuration Register (Calibration Register) 5.2.5 Figure 20. Setting the Configuration Register (Current LSB) Configuring the Alert Pin The Alert Pin from the INA230 allows the user to set limits that monitor the registers and trigger a flag when they are exceeded. The register that is being monitored can be changed by selecting the desired alert configuration as shown in Figure 21. The value that is being considered is compared to the Alert Limit box. This Alert Limit box modifies its functionality based on the selected configuration. It is important to note that by default, the INA230 Alert pin is set to active low. Figure 21. Configuring the Alert Pin SBOU124 – March 2012 Submit Documentation Feedback INA230EVM Evaluation Board and Software Tutorial Copyright © 2012, Texas Instruments Incorporated 19 INA230EVM Software Overview www.ti.com In addition to the INA230EVM software alert configuration, the Alert Configuration box includes the Conversion Ready button that allows for a special functionality on the Alert pin. When the INA230 completes the conversions for its current operation, it triggers the Alert pin and notifies the user that another conversion can be performed. In most cases, the INA230 conversion ready flag is not visible because of the speed of the INA230 conversion process. 5.3 Using the INA230EVM Software After configuring the INA230EVM software, the rest of the tabs can be evaluated. This section describes the basic operation of the device, and offers guidelines for interpreting the graphic user interface (GUI). 5.3.1 INA230 Bus Voltage, Shunt Voltage, Current, and Power Reading Bar The bottom bar of the INA230 software, as shown in Figure 22, allows the user to constantly check the status of the INA230 unit itself. These values are updated each time the Read All Reg button is pressed at the top of the software. In addition to the register values stored in the part, the software also includes flags for when the part is ready to trigger another conversion and when the Alert pin is triggered. Figure 22. INA230 Results Bar 5.3.2 Calculation and Theory of Operation The Calculation tab, as shown in Figure 23, allows the user to follow the software flow with basic calculations performed from within the device. It is important to note that the calculations are performed with the decimal values of the corresponding registers. Figure 23. Theory of Operation Flowchart on the Calculation Tab 20 INA230EVM Evaluation Board and Software Tutorial Copyright © 2012, Texas Instruments Incorporated SBOU124 – March 2012 Submit Documentation Feedback INA230EVM Software Overview www.ti.com 5.3.3 Register Tab The Register tab contains information on the individual operation of the INA230 registers. Each register can be changed on a bit-by-bit basis to allow the user to have total control of the device beyond the general functionality of the GUI alone. Most of this functionality is displayed in the Configuration register tab, but by selecting the appropriate register and clicking on the Help With Reg button on the Register tab, as shown in Figure 24, the user can diagnose the individual uses of each bit in each register. Figure 24. Registers Tab SBOU124 – March 2012 Submit Documentation Feedback INA230EVM Evaluation Board and Software Tutorial Copyright © 2012, Texas Instruments Incorporated 21 INA230EVM Software Overview 5.3.4 www.ti.com Graph Tab The Graph tab contains a plot window that shows the progression of data over time on the INA230. All four variables at the bottom of the EVM software (VBUS, VSHUNT, Current, and Power) can be plotted using the drop-down box directly above the graph. After the desired plot has been selected, toggle the Continuously Poll Data button above the plot to begin polling for data. If the user desires to save the data from the plot, simply select the USB Controls drop-down at the top of the page, then select the Start Graph Log option. Once the Start Graph Log has been selected, the user is prompted to select a location for the data and to name the file. Figure 25. Graphing the INA230 Data 5.3.5 Auto-Write and the Supply Voltage The INA230EVM software allows users to customize the board level voltage, regulated by the SM-USBDIG. By selecting either 3.3 V or 5 V, the user can designate which voltage the device should operate at. The software also includes an Auto-Write feature as shown in Figure 26, which is enabled by default. This feature automatically updates the register table whenever a change is made. When this feature is enabled, the Write All Registers button serves little purpose and is only used as an alternative to when AutWrite is disabled. Figure 26. Auto-Write, Power Button, and Voltage Control 22 INA230EVM Evaluation Board and Software Tutorial Copyright © 2012, Texas Instruments Incorporated SBOU124 – March 2012 Submit Documentation Feedback INA230EVM Documentation www.ti.com 6 INA230EVM Documentation This section contains the complete bill of materials, schematic diagram, and PCB layout for the INA230EVM. NOTE: The board layout is not to scale. This image is intended to show how the board is laid out; it is not intended to be used for manufacturing INA230EVM PCBs. 6.1 Schematic Figure 27 shows the schematic for the INA230EVM. Figure 27. INA230EVM Schematic SBOU124 – March 2012 Submit Documentation Feedback INA230EVM Evaluation Board and Software Tutorial Copyright © 2012, Texas Instruments Incorporated 23 INA230EVM Documentation 6.2 www.ti.com PCB Layout Figure 28 shows the component layout for the INA230EVM PCB. Figure 28. INA230EVM PCB Top Layer (Component Side) 24 INA230EVM Evaluation Board and Software Tutorial Copyright © 2012, Texas Instruments Incorporated SBOU124 – March 2012 Submit Documentation Feedback INA230EVM Documentation www.ti.com 6.3 Bill of Materials Table 6 lists the bill of materials for the INA230EVM. Table 6. Bill of Materials: INA230EVM Item No. Ref Des 1 R5, R6 Resistor, 10 kΩ 1/10 W 5% 0603 SMD Description Stackpole Electronics Vendor/Mfr RMCF0603JT10K0 Part Number 2 R3, R4 Resistor, 300 Ω 1/10 W 5% 0603 SMD Panasonic ERJ-3GEYJ301V 3 R1, R2 Resistor, 0.0 Ω 1/10 W 0603 SMD Stackpole Electronics RMCF0603ZT0R00 4 C2 5 Capacitor, Tantalum 4.7 μF 35 V 10% SM AVX Corp. TAJC475K035RNJ C3, C4 Capacitor, Ceramic 0.10 μF 25 V X7R 10% 0603 TDK Corp. C1608X7R1E104K 6 D1, D2 LED Green Wide Angle 0603 SMD Panasonic LNJ3W0C83RA 7 U1 INA230 Texas Instruments 8 Jumpers All Connector, Header 50-Position .100" SGL Samtec Gold TSW-150-07-G-S 9 Jumpers All Shunt LP w/Handle 2-Pos 30AU Tyco Electronics 881545-2 10 Test Points All PC Test Point Compact SMT Keystone Electronics 5016 11 T1 3-Block Terminal 3.5 mm On Shore Technology Inc ED555/3DS 12 T2, T3, T4 2-Block Terminal 3.5 mm On Shore Technology Inc ED555/2DS 13 Bumpons Bumpon Hemisphere 0.50 x 0.14 Clear 3M SJ-5312 (CLEAR) 14 J1 Connector, Socket RT Angle 1-Position 0.050 Mill-Max Manufacturing 851-93-10-20-001000 SBOU124 – March 2012 Submit Documentation Feedback INA230EVM Evaluation Board and Software Tutorial Copyright © 2012, Texas Instruments Incorporated 25 Evaluation Board/Kit Important Notice Texas Instruments (TI) provides the enclosed product(s) under the following conditions: This evaluation board/kit is intended for use for ENGINEERING DEVELOPMENT, DEMONSTRATION, OR EVALUATION PURPOSES ONLY and is not considered by TI to be a finished end-product fit for general consumer use. Persons handling the product(s) must have electronics training and observe good engineering practice standards. As such, the goods being provided are not intended to be complete in terms of required design-, marketing-, and/or manufacturing-related protective considerations, including product safety and environmental measures typically found in end products that incorporate such semiconductor components or circuit boards. This evaluation board/kit does not fall within the scope of the European Union directives regarding electromagnetic compatibility, restricted substances (RoHS), recycling (WEEE), FCC, CE or UL, and therefore may not meet the technical requirements of these directives or other related directives. Should this evaluation board/kit not meet the specifications indicated in the User’s Guide, the board/kit may be returned within 30 days from the date of delivery for a full refund. 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TI assumes no liability for applications assistance, customer product design, software performance, or infringement of patents or services described herein. Please read the User’s Guide and, specifically, the Warnings and Restrictions notice in the User’s Guide prior to handling the product. This notice contains important safety information about temperatures and voltages. For additional information on TI’s environmental and/or safety programs, please contact the TI application engineer or visit www.ti.com/esh. No license is granted under any patent right or other intellectual property right of TI covering or relating to any machine, process, or combination in which such TI products or services might be or are used. FCC Warning This evaluation board/kit is intended for use for ENGINEERING DEVELOPMENT, DEMONSTRATION, OR EVALUATION PURPOSES ONLY and is not considered by TI to be a finished end-product fit for general consumer use. It generates, uses, and can radiate radio frequency energy and has not been tested for compliance with the limits of computing devices pursuant to 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 will be required to take whatever measures may be required to correct this interference. EVM Warnings and Restrictions It is important to operate this EVM within the input voltage range of 0V to 5V and the output voltage range of 0V to 36V. Exceeding the specified input range may cause unexpected operation and/or irreversible damage to the EVM. If there are questions concerning the input range, please contact a TI field representative prior to connecting the input power. Applying loads outside of the specified output range may result in unintended operation and/or possible permanent damage to the EVM. Please consult the EVM User's Guide prior to connecting any load to the EVM output. If there is uncertainty as to the load specification, please contact a TI field representative. During normal operation, some circuit components may have case temperatures greater than +25°C. The EVM is designed to operate properly with certain components above +25°C as long as the input and output ranges are maintained. These components include but are not limited to linear regulators, switching transistors, pass transistors, and current sense resistors. These types of devices can be identified using the EVM schematic located in the EVM User's Guide. When placing measurement probes near these devices during operation, please be aware that these devices may be very warm to the touch. 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