Texas Instruments INA220EVM User manual

User’s Guide
INA220EVM (Rev C)
Precision Linear Products
ABSTRACT
This user’s guide describes the characteristics, operation, and use of the INA220 evaluation module (Rev C)
hardware. The 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 INA220EVM. This
document includes the physical printed circuit board layout, schematic diagrams, and circuit descriptions.
Table of Contents
1 Overview..................................................................................................................................................................................2
1.1 INA220EVM Hardware.......................................................................................................................................................2
1.2 Related Documentation from Texas Instruments............................................................................................................... 3
1.3 Information About Cautions and Warnings.........................................................................................................................4
2 System Setup.......................................................................................................................................................................... 5
2.1 Theory of Operation for INA220_Test_Board Hardware.................................................................................................... 5
2.2 Signal Definitions of J1 (25-Pin Male DSUB)..................................................................................................................... 7
2.3 Theory of Operation For USB_DIG_Platform.....................................................................................................................8
3 INA220EVM (Rev C) Hardware Setup....................................................................................................................................9
3.1 Electrostatic Discharge Warning........................................................................................................................................ 9
3.2 Typical Hardware Connections.......................................................................................................................................... 9
3.3 Connecting the Hardware................................................................................................................................................ 10
3.4 Connecting Power............................................................................................................................................................10
3.5 Connecting the USB Cable to the INA220EVM................................................................................................................11
3.6 INA220 Jumper Settings.................................................................................................................................................. 12
3.7 Connecting External Power to the INA220EVM...............................................................................................................15
3.8 Connecting External Signals to the INA220EVM............................................................................................................. 15
4 INA220 Software Overview.................................................................................................................................................. 16
4.1 INA220EVM Software Install............................................................................................................................................16
4.2 Starting the INA220EVM Software...................................................................................................................................16
4.3 Using the INA220 Software..............................................................................................................................................19
5 Bill of Materials..................................................................................................................................................................... 21
6 Revision History................................................................................................................................................................... 22
Trademarks
Microsoft® and Windows® are registered trademarks of Microsoft Corporation.
All trademarks are the property of their respective owners.
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1 Overview
This document provides the information needed to set up and operate the INA220EVM evaluation module, a test
platform for the INA220, a high or low side, bidirectional current and power monitor with an I2C interface. For a
more detailed description of the INA220, see also the product data sheet 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 INA220EVM is an evaluation module used to fully evaluate the INA220 current and power monitor
device. The INA220EVM consists of two printed circuit boards (PCBs). One board (the USB DIG Platform)
generates the digital signals required to communicate with the INA220, which is part of the second board
(INA220_Test_Board), as well as support and configuration circuitry.
Throughout this document, the abbreviation EVM and the term evaluation module are synonymous with the
INA220EVM.
Note
Much of the information contained in this user's guide is also presented in a quick-start video
(SBOU296), available for download from the INA220 product folder. TI recommends watching the
SBOI296 video.
1.1 INA220EVM Hardware
Figure 1-1 shows the hardware included with the INA220EVM 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.
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The complete kit includes the following items:
• INA220 test PCB
• USB DIG platform PCB
• USB cable
• Barrel plug cable assembly (part# 10-01935/ Tensility Intl Corp.) for external power supply to USB DIG and
optionally to EVM
• CD-ROM containing this user's guide, product software, and a demonstration video
Figure 1-1. Hardware Included with the INA220EVM
1.2 Related Documentation from Texas Instruments
The following document provides information regarding Texas Instruments integrated circuits used in the
assembly of the INA220EVM. This user's guide is available from the TI website under literature number
SBOU079. 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
INA220 Product Data Sheet SBOS459
USB DIG Platform Users Guide SBOU058
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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. Remember to read each caution
statement carefully.
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2 System Setup
Figure 2-1 shows the system setup for the INA220EVM. The PC runs software that communicates with the USB
DIG Platform. The USB DIG Platform generates the analog and digital signals used to communicate with the
INA220_Test_Board. Users can connect the INA220_Test_Board to the system and monitor the power, current,
and voltage of the system under test conditions.
USB DIG
Platform
INA220
Test Board
EVM
Power
System on which we will measure
Shunt Current, Bus Voltage, and Power
System
Power
Shunt
Resistor
System
Load
Figure 2-1. INA220EVM Hardware Setup
2.1 Theory of Operation for INA220_Test_Board Hardware
Figure 2-2 shows a block diagram of the INA220_Test_Board. The printed circuit board (PCB) provides
connections to the I2C interface and general-purpose input and outputs (GPIO) on the USB DIG Platform board.
The PCB also provides connection points for external connections of the shunt voltage, bus voltage, and GND.
INA220
V Supply
Switched 5.0V Power
DUT Connection to
Shunt Voltage
and GND
25-Pin
Male DSUB Signals
From USB DIG Platform I C
Address
Jumpers
2
I C
Interface
2
Figure 2-2. INA220_Test_Board Block Diagram
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Figure 2-3 shows the system setup for the INA220_Test_Board schematic. D1 is an LED that indicates whether
the INA220 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.
1 2 3 4 5 6 7 8 9
10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25
J1
CON25
ONE_WIRE
Vdut Vcc
DAC_A
DAC_B DAC_C
DAC_D
ads2_Vin+ ads1_Vin+ ads2_Vin-
I2C_SDA_ISO
ads1_Vin-
I2C_SCK_ISO
INA-
XTR -Loop XTR +Loop
-15V +15V
SPI_DOUT1
SPI_SCK SPI_CS1 I2C_SCK
SPI_DIN1 I2C_SDA2
Vs
I2C_SDA_ISO I2C_SCK_ISO
I2C_SDA_ISO I2C_SCK_ISO
A1
Vin+ Vin- SCL SDA
A0
Vs
+
C3 10uF
R5
4.02k
D1
LED
Vdut
R3
10k
R4
10k
Vs
Burr Brown Products
LOGO2
Burr Brown Products
LOGO1
R2
10
R1
10
C2
0.1uF
1
2
3
JMP1
Vs_Ext
1
2
T1
T_STRIP2
SDA
SCL
Vs
Vs Ext Vdut
GND GND
Scope_GND
Vs
A1
Vin -
Vin + C1
0.1uF
1 2
T2
T_STRIP2
1
2
T3 T_STRIP2
GND
GND
1
2
3
JMP5
1
2
3
JMP4
Vs
I2C_SDA_ISO I2C_SCK_ISO
1
2
3
JMP3
1
2
3
JMP2
DAC_A
DAC_B
DAC_A and DAC_B used for Test with USB DAQ Platform only.
Vin+
10
Vin-
9
Gnd 7
VS
6
SCL
5
SDA
4
AO 2
A1 1
VBUS
8
U1
INA220
1 2 3
T4
T_STRIP3
VBus
VBus A0
Figure 2-3. INA220_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 INA220_Test_Board. This table also lists the signals
connected to pins on J1 that are not used on the INA220_Test_Board.
Table 2-1. Signal Definition of J1 (25-Pin Male DSUB) on INA220_Test_Board
J1 PIN SIGNAL INA220 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
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2.3 Theory of Operation For USB_DIG_Platform
Figure 2-4 shows the block diagram for the 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
USB DIG Platform.
USB DIG EVM
External
Power
USB Connection
from Computer
V
5V
USB
Adjustable
Regulator
Power
Switching
3.3V
Regulator
Buffers and
Latches
TUSB3210
8052 C
with USB Interface
and UART
m
Reset Button
and Power-On
Reset
8Kx8-Byte
EEPROM
V
(2.7V to
5.5V)
CC
V
(2.7V to 5.5V)
DUT
Switched Power
I C
SPI
Control Bits
Measure Bits
2
V
3.3V
SmC
Figure 2-4. USB_DIG_Platform Theory of Operation
The USB DIG can provide power to the EVM PCB. As depicted in Figure 2-4, switched power for the EVM can
be derived from the USB supply of the PCB or from an external power source connected to J5. TI recommends
using the external supply option because the USB power supply can be noisy. The barrel connector cable
assembly included in the EVM kit can connect an external power supply to the USB DIG. Connect the black wire
of the cable assembly to the low side (or ground) of the external supply and the red wire to the high side.
Note
For proper operation, the external source must provide a supply voltage between 5.8 V and 10.4 V
and have a current limit greater than 100 mA.
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3 INA220EVM (Rev C) Hardware Setup
The INA220EVM (Rev C) hardware setup involves connecting the two 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 INA220EVM 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 INA220EVM hardware setup involves connecting the two PCBs of the EVM together, applying power, and
connecting an external shunt and load. The external connections may be the real-world system that the INA220
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 two PCBs of the INA220EVM together, gently push on both sides of the D-SUB connectors (as
shown in Figure 3-2). Ensure the two connectors are completely pushed together; loose connections may cause
intermittent operation.
3.4 Connecting Power
After the two PCBs of the INA220 EVM are connected, as Figure 3-2 shows, connect the power to the EVM.
Always connect power before connecting the USB cable. If the USB cable is connected before the power, the
computer will attempt to communicate with an unpowered and unresponsive device
Figure 3-2. Connecting Power to the EVM
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3.5 Connecting the USB Cable to the INA220EVM
Figure 3-3 shows the typical response to connecting the USB DIG platform to a PC USB port for the first time.
Note that the EVM must be powered on before connecting the USB cable. Typically, the computer will respond
with a Found New Hardware, USB Device pop-up. The pop-up typically changes to Found New Hardware, USB
Human Interface Device. This pop-up indicates that the device is ready for use. The 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 3-3. Connecting the USB Cable
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3.6 INA220 Jumper Settings
Figure 3-4 shows the default jumpers configuration for the INA220EVM. In general, the jumper settings of
the USB DIG Platform will not need to be changed, but you may want to change some of the jumpers on
the INA220_Test_Board to match your specific configuration. For instance, you may wish to set a specific I2C
address.
Figure 3-4. INA220EVM Default Jumper Settings
Table 3-1 explains the function of the jumpers on the INA220_Test_Board.
Table 3-1. INA220_Test_Board Jumper Functions
JUMPER DEFAULT PURPOSE
JMP1 VDUT
This jumper determines the source for the INA220
power supply. In the Vdut position, the USB DIG
board supplies the power to the INA220. In the
Vs_Ext position, an external supply connected to
the INA220 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
INA220.
JMP4, JMP5 JMP4 (GND)
A1 address input selection. This jumper determines
which signal is connected to the A1 pin of the
INA220.
Table 3-2 summarizes the function of the USB DIG platform jumpers. For most applications, the default jumper
position will be used. Table 3-3 and Table 3-4 describe the options for the power-supply configuration. For
example, the logic power supply can be changed from the default of 5 V to 3 V. A separate document
(SBOU058) details the operation and design of the USB DIG platform.
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Table 3-2. USB DIG Platform Jumper Settings
JUMPER DEFAULT PURPOSE
JUMP1 EXT This jumper selects external power or bus power. External power is
applied on J5 (on USB DIG board) or T3 (9 VDC). Bus power is 5
V from the USB. External power is typically used because the USB
power is noisy.
JUMP2 EXT Same as JUMP1.
JUMP3 EE ON This jumper determines where the TUSB3210 will load the USB DIG
Platform firmware upon power-up or reset. The EE Off position is
used for development for development or firmware updates.
JUMP4, JUMP5 L, L This jumper sets the address for the USB board. Only change from
the default setting if using multiple boards.
JUMP9 5 V This jumper selects the voltage of the device under test supply (VDUT
= 5 V or 3 V). This jumper is typically the only jumper that is changed
for most applications.
JUMP10 WP ON This jumper write-protects the firmware EEPROM.
JUMP11 WP ON This jumper write-protects the calibration EEPROM.
JUMP13 Reg This jumper uses the regulator output to generate the VDUT supply.
The USB can be used as the VDUT supply.
JUMP14 9 V This jumper uses the external power (9 V as apposed to the bus)
JUMP17 BUS While in the BUS position, VDUT operation is normal. While in the
VRAW position, the VDUT supply is connected to an external source.
This flexibility allows for any value of VDUT between 3 V and 5 V.
CAUTION
When JUMP17 is in the VRAW position, adjusting
the VDUT voltage beyond the 3 V to 5 V range will
damage the EVM.
JUMP18 VDUT This jumper connects the pullup on the GPIO to the VDUT supply or
the VCC supply.
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Table 3-3. Power-Supply Jumper Configuration #1
MODE JUMPER COMMENT
External Power—5V
(default jumper settings)
JUMP17 = BUS (not used)
JUMP13 = REG
JUMP14 = 9 V
JUMP1 = EXT
JUMP2 = EXT
JUMP6 = 5 V
JUMP7 = REF
In this mode, all power is supplied to the EVM by J5 (on USB DIG board)
or T3. The external supply must be between 5.8 V and 10.4 V for proper
operation. All digital I/Os are regulated to 5 V using U19 (REG101).
External Power—3V
(typical jumper settings)
JUMP17 = BUS (not used)
JUMP13 = REG
JUMP14 = 9 V
JUMP1 = EXT
JUMP2 = EXT
JUMP6 = 3 V
JUMP7 = REF
In this mode, all power is supplied to the EVM by J5 (on USB DIG board)
or T3. The external supply must be between 5.8 V and 10.4 V for proper
operation. All digital I/Os are regulated to 3 V using U19 (REG101).
External Power—Variable
Supply
JUMP17 = Vraw
JUMP13 = BUS
JUMP14 = 9 V (not used)
JUMP1 = EXT
JUMP2 = EXT
JUMP6 = 5 V (not used)
JUMP7 = REG (ratiometric
mode)
In this mode, all the digital I/Os are referenced to the supply that is attached
to either J5 (on USB DIG board) or T3.
CAUTION
It is absolutely critical that the supply voltage does not exceed
5.5 V in this mode.
The supply is directly applied to devices with 5.5 V absolute maximum
ratings. This mode of operation is useful when a device supply other than
3.0 V or 5.0 V is required.
Table 3-4. Power-Supply Jumper Configuration #2
MODE JUMPER COMMENT
Bus Power—5V JUMP17 = BUS
JUMP13 = BUS
JUMP14 = 9 V (not used)
JUMP1 = BUS
JUMP2 = BUS
JUMP6 = 5 V (not used)
JUMP7 = REG (ratiometric
mode, 5-V supply)
In this mode, the USB bus completely powers the EVM. The USB bus is
regulated by the controller (computer) to be 5 V. This mode relies upon
external regulation. This mode is recommended only when an external 9-V
supply is not available. If an external 9-V supply is available, use either
External Power—5V mode or External Power—3V mode.
Bus Power—3V JUMP17 = BUS (not used)
JUMP13 = REG
JUMP14 = BUS
JUMP1 = BUS
JUMP2 = BUS
JUMP6 = 3 V
JUMP7 = REG (ratiometric
mode, 5-V supply)
In this mode, the USB bus completely powers the EVM. The regulator (U19,
REG101) generates a 3-V supply for all digital I/O.
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3.7 Connecting External Power to the INA220EVM
The INA220 power supply (VS) operates in the range of 3 V to 5.5 V (see the INA220 product data sheet).
The default jumper position provides 5 V to the INA220 from the USB-DIG-Platform. The power from the
USB-DIG-Platform can be changed to 3 V using JUMP9.
Another option is to connect power to the INA220 power supply (VS) using an external power supply. In this
case, connect power to the T3 terminal block and set JMP1 to the Vs_EXT position. The INA220 power supply
(VS) operates in the range of 3 V to 5.5 V; do not operate outside of this range.
3.8 Connecting External Signals to the INA220EVM
The INA220 shunt and bus voltages are applied through the terminal block T4. The T4 terminal block is a direct
connection to VIN+ and VIN– of the INA220. The bus voltage is monitored on VBUS (26 V maximum). The shunt
voltage is the difference between VIN– and VIN+ (320 mV maximum). See also the INA220 data sheet.
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4 INA220 Software Overview
This section discusses the installation and operation of the INA220 software.
4.1 INA220EVM Software Install
Follow these steps to install the INA220EVM software:
1. Software can be downloaded from the INA220EVM web page, or from the disk included with the
INA220EVM, which contains a folder called Install_software/.
2. Find the file called setup.exe. Double-click the file to start the installation process.
3. Follow the on-screen prompts to install the software.
4. To remove the application, use the Windows Control Panel utility, Add/Remove Software.
The INA220 Quick-Start Video (included with the kit, or available for download in the INA220 product folder)
details the initialization of the software.
4.2 Starting the INA220EVM Software
The INA220 software can be operated through the Windows Start menu. From Start, select All Programs;
then select the INA220EVM program. Figure 4-1 shows how the software will appear if the EVM is functioning
properly.
Figure 4-1. INA220EVM Software—Functioning Properly
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Figure 4-2 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. This error can also occur if you connect the
USB cable before the USB DIG Platform 9-V power source. Another reason for this error is that there may be
an issue with the computer USB Human Interface Device Driver. Make sure that when you plug the in the USB
cable, the computer recognizes the device. If the sound is on, you will hear the distinctive sound that you expect
when a USB device is properly connected to the PC.
Figure 4-2. INA220EVM Software—No Communication with the USB DIG Platform
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Figure 4-3 shows an error that occurs if the INA220_Test_Board is not communicating with the USB DIG
Platform. If you see this error, check the connectors between the two boards; make sure the 25-pin connectors
are completely pushed together. Also make sure the INA220_Test_Board jumpers are set in the right position.
Figure 4-3. INA220EVM Software—No Communication with the USB DIG Platform and INA220
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4.3 Using the INA220 Software
The INA220EVM software has six different tabs that allow access to the different features of the INA220. The
first four tabs are designed to allow for complete configuration of the device by stepping through the tabs in
order. Each tab is intended to have an intuitive graphical interface that fosters a better understanding of the
device.
4.3.1 Overview Tab
The Overview tab has the following controls:
• Turn the power supply on and off
• Set the I2C address
4.3.2 Config Tab
The Config tab has the following controls:
• Shunt voltage attenuator range (smallest range: 40 mV; largest range: 320 mV)
• Shunt voltage configuration: resolution and number of averages. Note that increasing the number of averages
decreases the noise but slows down the conversion rate.
• Bus voltage attenuator range (16 V and 32 V): Note that the maximum bus voltage for the INA220 is 26 V.
Thus, the 32V range cannot be fully used.
• Bus voltage configuration: Resolution and number of averages. Note that increasing the number of averages
decreases noise but slows down the conversion rate.
• A/D converter mode: This control determines how the converters work. The most commonly used modes are
Shunt and Bus continuous conversion mode. This mode causes both converters to run continuously.
More details on these options are explained in the product data sheet.
4.3.3 Calibration Tab
The Calibration tab allows users to enter some information regarding the INA220 configuration in a given
application. This information is used to compute the Full-Scale Cal Register. The Full-Scale Cal Register
converts the shunt voltage to a current value. The detailed mathematics behind this calibration feature is given in
the INA220 data sheet. Also, this feature is explained in a step-by-step manner in the video.
4.3.4 Scaling Tab
The Scaling tab allows you to see how the mathematical operations work in the INA220. Specifically, this tab
shows how the current and power values are computed using the full-scale calibration register.
4.3.5 Graph Tab
The Graph tab will display bus voltage, shunt current, and power versus time when the software is in continuous
convert mode.
4.3.6 Registers Tab
The Registers tab allows you to read and edit all the registers in the INA220. All the previous tabs affect the
register listing. For example, changing the A/D configuration on Tab 2 will affect Register 0 in the register list. It is
also true that changing register 0 updates the A/D configuration on Tab 2. Thus, the graphical representation and
register representation affect each other.
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4.3.7 EVM Controls Pull-Down Menu
The INA220 configuration (register settings) can be saved or loaded using the EVM Controls drop-down menu,
as Figure 4-4 shows. The file that the configuration is saved into is a simple text file and can be viewed with any
text editor.
Figure 4-4. EVM Controls Drop-Down Menu
4.3.8 Software Revision
The Help...About feature can be used to check the current software revision, as Figure 4-5 illustrates. This
document is based on revision 1.0.35.
Figure 4-5. Current Software Revision
INA220 Software Overview www.ti.com
20 INA220EVM (Rev C) SBOU079C – JULY 2009 – REVISED MARCH 2023
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