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.
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 ............................................................
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.
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.
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.
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.
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).
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.
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.
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.
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.
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.
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.
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 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.
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.
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.
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.
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).
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).
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.
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.
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 * $<& 8 ! =; & $$ * ; ' $ + ' ; 7 # # ' ; $! ( ' 336 1 ' ; $ ' ; + $ $ ! $<& 7 &; * + , ; ( .
INA223EVM Documentation 6.3 www.ti.com PCB Component Layout Figure 24 shows the layout of the components for the INA223EVM PCB. Figure 24.
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.
EVALUATION BOARD/KIT/MODULE (EVM) ADDITIONAL TERMS Texas Instruments (TI) provides the enclosed Evaluation Board/Kit/Module (EVM) under the following conditions: The user assumes all responsibility and liability for proper and safe handling of the goods. Further, the user indemnifies TI from all claims arising from the handling or use of the goods.
FCC Interference Statement for Class B EVM devices This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications.
【Important Notice for Users of this Product in Japan】 】 This development kit is NOT certified as Confirming to Technical Regulations of Radio Law of Japan If you use this product in Japan, you are required by Radio Law of Japan to follow the instructions below with respect to this product: 1. 2. 3. Use this product in a shielded room or any other test facility as defined in the notification #173 issued by Ministry of Internal Affairs and Communications on March 28, 2006, based on Sub-section 1.
EVALUATION BOARD/KIT/MODULE (EVM) WARNINGS, RESTRICTIONS AND DISCLAIMERS For Feasibility Evaluation Only, in Laboratory/Development Environments. Unless otherwise indicated, this EVM is not a finished electrical equipment and not intended for consumer use.
IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, enhancements, improvements and other changes to its semiconductor products and services per JESD46, latest issue, and to discontinue any product or service per JESD48, latest issue. Buyers should obtain the latest relevant information before placing orders and should verify that such information is current and complete.
