Texas Instruments INA219EVM User manual

User's Guide
INA219EVM Rev A Model User's Guide and Software
Tutorial
ABSTRACT
This user’s guide describes the characteristics, operation, and use of the INA219 evaluation module (Rev A)
hardware. This document covers all pertinent areas involved to properly use this EVM board. Throughout this
document, the terms evaluation board, evaluation module, and EVM are synonymous with the INA219EVM. This
document includes the physical printed circuit board layout, schematic diagrams, and circuit descriptions.
Table of Contents
1 Overview..................................................................................................................................................................................2
1.1 INA219EVM Hardware.......................................................................................................................................................2
1.2 Related Documentation from Texas Instruments............................................................................................................... 3
1.3 Information About Cautions and Warnings.........................................................................................................................3
2 System Setup.......................................................................................................................................................................... 4
2.1 Theory of Operation for INA219_Test_Board Hardware.................................................................................................... 4
2.2 Signal Definitions of J1 (25-Pin Male DSUB)..................................................................................................................... 6
2.3 Theory of Operation For SM-USB-DIG Platform................................................................................................................7
3 INA219EVM (Rev A) Hardware Setup....................................................................................................................................8
3.1 Electrostatic Discharge Warning........................................................................................................................................ 8
3.2 Typical Hardware Connections.......................................................................................................................................... 8
3.3 Connecting the Hardware.................................................................................................................................................. 9
3.4 Connecting the USB Cable to the INA219EVM................................................................................................................. 9
3.5 INA219 Jumper Settings.................................................................................................................................................. 10
3.6 Connecting External Power to the INA219EVM............................................................................................................... 11
3.7 Connecting External Signals to the INA219EVM..............................................................................................................11
4 INA219 Software Overview.................................................................................................................................................. 12
4.1 Operating Systems for INA219 Software......................................................................................................................... 12
4.2 INA219EVM Software Install............................................................................................................................................12
4.3 Starting the INA219EVM Software...................................................................................................................................12
4.4 Using the INA219 Software..............................................................................................................................................16
5 Bill of Materials..................................................................................................................................................................... 18
6 Revision History................................................................................................................................................................... 19
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1 Overview
This document provides the information needed to set up and operate the INA219EVM evaluation module, a test
platform for the INA219, a high-side measurement, bidirectional current/power monitor with I2C interface. For a
more detailed description of the INA219, see also the product data sheet (SBOS448) available from the Texas
Instruments website at http://www.ti.com. Additional support documents are listed in the section of this guide
entitled Related Documentation from Texas Instruments.
The INA219EVM is an evaluation module used to fully evaluate the INA219 current and power monitor device.
The INA219EVM consists of three printed circuit boards (PCBs). One board (the SM-USB-DIG Platform)
generates the digital signals required to communicate with the INA219, which is part of the second board
(INA219_Test_Board), as well as support and configuration circuitry. The last board (SENS009) is an interface
board between the SM-USB-DIG and the INA219_Test_Board.
Throughout this document, the abbreviation EVM and the term evaluation module are synonymous with the
INA219EVM.
1.1 INA219EVM Hardware
Figure 1-1 shows the hardware included with the INA219EVM kit. Contact the Texas Instruments customer
support center if any component is missing. TI recommends users check the TI website at http://www.ti.com to
verify that they have the latest versions of the related software.
The complete kit includes the following items:
• INA219 test PCB
• SM-USB-DIG platform PCB
• USB cable
• SENS009 adapter PCB
• CD-ROM containing product software
Figure 1-1. Hardware Included with the INA219EVM
Overview www.ti.com
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1.2 Related Documentation from Texas Instruments
The following document provides information regarding Texas Instruments integrated circuits used in the
assembly of the INA219EVM. This user's guide is available from the TI website under literature number
SBOU074. 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 website at http://
www.ti.com/, or call the Texas Instruments Literature Response Center at [phone] or the Product
Information Center at [phone]. When ordering, identify the document by both title and literature number.
DOCUMENT LITERATURE
NUMBER
INA219 Product Data Sheet SBOS448
SM-USB-DIG Platform Users Guide SBOU098
1.3 Information About Cautions and Warnings
This document contains caution statements.
CAUTION
This is an example of a caution statement. A caution statement describes a situation that can
potentially damage your software or equipment.
The information in a caution or a warning is provided for your protection. Please read each caution carefully.
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2 System Setup
Figure 2-1 shows the system setup for the INA219EVM. 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 INA219_Test_Board. Users can connect the INA219_Test_Board to the system and monitor the power,
current, and voltage of the system under test conditions.
System on Which Shunt Current
Bus Voltage, and Power is Measured
System
Power
Shunt
Resistor
System
Load
SM-USB-DIG
Platform
SENS009
Adapter
INA219
Test Board
Figure 2-1. INA219EVM Hardware Setup
2.1 Theory of Operation for INA219_Test_Board Hardware
Figure 2-2 shows a block diagram of the INA219_Test_Board. The printed circuit board (PCB) provides
connections to the I2C and general-purpose input and outputs (GPIO) on the SM-USB-DIG Platform board.
The PCB also provides connection points for external connections of the shunt voltage, bus voltage, and GND.
INA219
V Supply
Switched 5.0V Power
DUT Connection to
Shunt Voltage
and GND
25-Pin
Male DSUB Signals
From USB DIG Platform I C
2
Address
Jumpers
I C
Interface
2
Figure 2-2. INA219_Test_Board Block Diagram
System Setup www.ti.com
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Figure 2-3 shows the system setup for the INA219_Test_Board schematic. D1 is an LED that indicates whether
the INA219 Test Board is receiving power. Jumpers allow the selection of the power source as well as
configuration of A0 and A1. Connector T4 allows the connection of the shunt and bus voltages.
Figure 2-3. INA219_Test_Board Schematic
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2.2 Signal Definitions of J1 (25-Pin Male DSUB)
Table 2-1 lists the different signals connected to J1 on the INA219_Test_Board. This table also lists the signals
connected to pins on J1 that are not used on the INA219_Test_Board.
Table 2-1. Signal Definition of J1 (25-Pin Male DSUB) on INA219_Test_Board
J1 PIN SIGNAL INA219 PIN
1 NC No connection
2 NC No connection
3 NC No connection
4 NC No connection
5 NC No connection
6 NC No connection
7 NC No connection
8 NC No connection
9 I2C_SCK No connection
10 I2C_SDA2 No connection
11 NC No connection
12 I2C_SCK_ISO I2C clock signal (SCL) channel 1; can be
disconnected using a switch
13 I2C_SDA_ISO I2C data signal (SDA) channel 1; can be
disconnected using a switch
14 NC No connection
15 NC No connection
16 NC No connection
17 VDUT Switched 3-V or 5-V power. Note that when power
is switched off, the digital I/O is also switched off.
18 VCC No connection
19 NC No connection
20 NC No connection
21 GND Common or ground connection for power
22 SPI_SCK No connection
23 SPI_CS1 No connection
24 SPI_DOUT No connection
25 SPI_DIN1 No connection
System Setup www.ti.com
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2.3 Theory of Operation For SM-USB-DIG Platform
Figure 2-4 shows the block diagram for the SM-USB-DIG Platform. This platform is a general-purpose data
acquisition system used on other Texas Instruments evaluation modules. The details of the USB DIG Platform
operation are included in a separate document (available for download at www.ti.com). The block diagram
shown in Figure 2-4 gives a brief overview of the platform. The TUSB3210 is the primary control device for the
SM-USB-DIG Platform.
TUSB3210
8052 Cm
with USB Interface
and UART
8K 8-byte×
EEPROM
+3.3 V
VUSB
+5 V
Power-On Reset SM USB DIG Platform
To Test Board
To Computer and Power Supplies
Power
Switching
Switched
Power
USB Bus
from
Computer
USB Power
+5.0 V
+3.0 V
V
(H-Z, 3.3 V, or 5 V)
DUT
Buffers and
Level Translators
I C/SPI
Control and
Measure Bits
2
+3.3-V
Regulator
Copyright © 2017, Texas Instruments Incorporated
Figure 2-4. SM-USB-DIG Platform Theory of Operation
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3 INA219EVM (Rev A) Hardware Setup
The INA219EVM (Rev A) hardware setup involves connecting the three PCBs of the EVM together, applying
power, connecting the USB cable, and setting the jumpers. This section details this procedure.
3.1 Electrostatic Discharge Warning
Many of the components on the INA219EVM are susceptible to damage by electrostatic discharge (ESD).
Customers are advised to observe proper ESD handling precautions when unpacking and handling the EVM,
including the use of a grounded wrist strap at an approved ESD workstation.
CAUTION
Failure to observe ESD handling procedures may result in damage to EVM components.
3.2 Typical Hardware Connections
The INA219EVM hardware setup involves connecting the three PCBs of the EVM together, and connecting
an external shunt and load. The external connections may be the real-world system that the INA219 will be
incorporated into. Figure 3-1 shows the typical hardware connections.
Figure 3-1. Typical Hardware Connections
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3.3 Connecting the Hardware
To connect the three PCBs of the INA219EVM together, gently push on both sides of the D-SUB connectors (as
Figure 3-1 shows). Ensure the two connectors are completely pushed together; loose connections may cause
intermittent operation. Finally, connect the SM-USB-DIG to the SENS009 board as Figure 3-1 shows.
3.4 Connecting the USB Cable to the INA219EVM
Figure 3-2 shows the typical response to connecting the SM-USB-DIG platform to a PC USB port for the
first time. 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 for use. The SM-USB-DIG platform uses the Human Interface Device Drivers that are part of the
Microsoft® Windows® operating system.
In some cases, the Windows Add Hardware Wizard will pop up. If this prompt occurs, click Yes to allow the
system device manager to install the Human Interface Drivers.
Figure 3-2. Response from Connecting the USB Cable
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3.5 INA219 Jumper Settings
Figure 3-3 shows the default jumpers configuration for the INA219EVM. Generally, the jumper settings of the
SM-USB-DIG Platform will not need to be changed, but you may want to change some of the jumpers on
the INA219_Test_Board to match your specific configuration. For instance, you may wish to set a specific I2C
address.
Default Jumpers
Figure 3-3. INA219EVM Default Jumper Settings
Table 3-1 explains the function of the jumpers on the INA219_Test_Board.
Table 3-1. INA219_Test_Board Jumper Functions
JUMPER DEFAULT PURPOSE
JMP1 VDUT
This jumper determines the source for the INA219
power supply. In the Vdut position, the SM-USB-
DIG board supplies the power to the INA219. In the
Vs_Ext position, an external supply connected to
the INA219 T3 terminal supplies power.
JMP2, JMP3 JMP2 (GND)
A0 address input selection. This jumper determines
which signal is connected to the A0 pin of the
INA219.
JMP4, JMP5 JMP4 (GND)
A1 address input selection. This jumper determines
which signal is connected to the A1 pin of the
INA219.
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