Texas Instruments INA220 User manual

User's Guide
SBOU079A–July 2009–Revised February 2010
INA220 Evaluation Module
This user’s guide describes the characteristics, operation, and use of the INA220 evaluation module
(EVM). It covers all pertinent areas involved to properly use this EVM board. This document includes the
physical printed circuit board layout, schematic diagrams, and circuit descriptions.
Contents
1 Overview ..................................................................................................................... 2
2 System Setup ................................................................................................................ 4
3 INA220EVM Hardware Setup ............................................................................................. 7
4 INA220 Software Overview .............................................................................................. 14
5 Bill of Materials ............................................................................................................. 20
List of Figures
1 Hardware Included with the INA220EVM................................................................................ 2
2 INA220EVM Hardware Setup ............................................................................................. 4
3 INA220_Test_Board Block Diagram...................................................................................... 4
4 INA220_Test_Board Schematic........................................................................................... 5
5 USB_DIG_Platform Theory of Operation ................................................................................ 7
6 Typical Hardware Connections............................................................................................ 8
7 Connecting Power to the EVM............................................................................................ 9
8 Connecting the USB Cable............................................................................................... 10
9 INA220EVM Default Jumper Settings .................................................................................. 11
10 INA220EVM Software—Functioning Properly ......................................................................... 15
11 INA220EVM Software—No Communication with the USB DIG Platform.......................................... 16
12 INA220EVM Software—No Communication with the USB DIG Platform and INA220........................... 17
13 EVM Controls Drop-Down Menu ........................................................................................ 19
14 Current Software Revision ............................................................................................... 19
List of Tables
1 Signal Definition of J1 (25-Pin Male DSUB) on INA220_Test_Board................................................ 6
2 INA220_Test_Board Jumper Functions ................................................................................ 11
3 USB DIG Platform Jumper Settings..................................................................................... 12
4 Power-Supply Jumper Configuration #1................................................................................ 13
5 Power-Supply Jumper Configuration #2................................................................................ 13
14 INA220_Test_Board Parts List .......................................................................................... 20
Microsoft, Windows are registered trademarks of Microsoft Corporation.
I2C is a trademark of NXP Semiconductors.
All other trademarks are the property of their respective owners.
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This datasheet has been downloaded fromhttp://www.digchip.com at this page

Overview www.ti.com
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, bi-directional current/power monitor with an I2C™
interface. For a more detailed description of the INA220, please refer to the product data sheet
(SBOS459) available from the Texas Instruments web site 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 that is used to fully evaluate the INA220 current/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. It is highly
recommended that you watch this video.
1.1 INA220EVM Hardware
Figure 1 shows the hardware included with the INA220EVM kit. Contact the factory if any component is
missing. It is highly recommended that you check the TI web site at http://www.ti.com to verify that you
have the latest versions of the related software.
Figure 1. Hardware Included with the INA220EVM
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www.ti.com Overview
The complete kit includes the following items:
• INA220 test PCB
• USB DIG platform PCB
• USB cable
• +6V power supply
• CD-ROM containing this user's guide, product software, and a demonstration video
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 web site 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 web site
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
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 could 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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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
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
System Setup www.ti.com
2 System Setup
Figure 2 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. Connectors on the INA220_Test_Board allow the user to connect to the
system under test whose power, current, and voltage will be monitored.
Figure 2. INA220EVM Hardware Setup
2.1 Theory of Operation for INA220_Test_Board Hardware
Figure 3 presents a block diagram of the INA220_Test_Board. The functionality of this PCB is relatively
simple. It provides connections to the I2C interface and general-purpose input/outputs (GPIO) on the USB
DIG Platform board. It also provides connection points for external connections of the shunt voltage, bus
voltage, and GND.
Figure 3. INA220_Test_Board Block Diagram
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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
www.ti.com System Setup
Figure 4 illustrates 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.
Figure 4. INA220_Test_Board Schematic
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2.2 Signal Definitions of J1 (25-Pin Male DSUB)
Table 1 lists the different signals connected to J1 on the INA220_Test_Board. This table also identifies
signals connected to pins on J1 that are not used on the INA220_Test_Board.
Table 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 3V or 5V 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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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
www.ti.com INA220EVM Hardware Setup
2.3 Theory of Operation For USB_DIG_Platform
Figure 5 shows the block diagram for the 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 (available for download at www.ti.com). The block
diagram shown in Figure 5 gives a brief overview of the platform. The primary control device on the USB
DIG Platform is the TUSB3210.
Figure 5. USB_DIG_Platform Theory of Operation
3 INA220EVM Hardware Setup
The INA220EVM hardware setup 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
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.
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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 6 shows the typical hardware connections.
Figure 6. Typical Hardware Connections
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 7). Make sure that the two connectors are completely pushed together; loose
connections may cause intermittent operation.
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3.4 Connecting Power
After the two parts of the INA220 EVM are connected, as Figure 7 illustrates, connect the power to the
EVM. Always connect power before connecting the USB cable. If you connect the USB cable before
connecting the power, the computer will attempt to communicate with an unpowered device that will not be
able to respond.
Figure 7. Connecting Power to the EVM
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3.5 Connecting the USB Cable to the INA220EVM
Figure 8 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 to be used.
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, allow the system
device manager to install the Human Interface Drivers by clicking Yes when requested to install drivers.
Figure 8. Connecting the USB Cable
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3.6 INA220 Jumper Settings
Figure 9 shows the default jumpers configuration for the INA220EVM. In general, the jumper settings of
the USB DIG Platform will not need to be changed. 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 9. INA220EVM Default Jumper Settings
Table 2 explains the function of the jumpers on the INA220_Test_Board.
Table 2. INA220_Test_Board Jumper Functions
Jumper Default Purpose
This jumper determines the source for the INA220
power supply. In the Vdut position, the USB DIG
JMP1 VDUT board supplies the power to the INA220. In the
Vs_Ext position, an external supply connected to
the INA220 T3 terminal supplies power.
A0 address input selection. This jumper determines
JMP2, JMP3 JMP2 (GND) which signal is connected to the A0 pin of the
INA220.
A1 address input selection. This jumper determines
JMP4, JMP5 JMP4 (GND) which signal is connected to the A1 pin of the
INA220.
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Table 3 summarizes the function of the USB DIG platform jumpers. For most applications, the default
jumper position should be used. Table 4 and Table 5 describe the options for the power-supply
configuration. For example, the logic power supply can be changed from the default of 5V to 3V. A
separate document (SBOU058) gives details regarding the operation and design of the USB DIG platform.
Table 3. USB DIG Platform Jumper Settings
Jumper Default Purpose
JUMP1 EXT This jumper selects external power or bus power. External
power is applied on J5 or T3 (9VDC). Bus power is 5V 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. The only
reason to change from the default setting is if multiple boards
are being used.
JUMP9 5V This selects the voltage of the device under test supply (VDUT =
5V or 3V). This jumper is typically the only jumper that is
changed for most applications.
JUMP10 WP ON This write-protects the firmware EEPROM.
JUMP11 WP ON This write-protects the calibration EEPROM.
JUMP13 Reg Uses the regulator output to generate the VDUT supply. The USB
can be used as the VDUT supply.
JUMP14 9V Uses the external power (9V 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 3V
and 5V.
CAUTION
When JUMP17 is in the
VRAW position, adjusting
the VDUT voltage beyond
the 3V to 5V range will
damage the EVM.
JUMP18 VDUT Connects the pull-up on the GPIO to the VDUT supply or the VCC
supply.
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Table 4. Power-Supply Jumper Configuration #1
Mode Jumper Comment
External Power—5V JUMP17 = BUS (not used) In this mode, all power is supplied to the EVM via J5 or T3. The external
(default jumper settings) JUMP13 = REG supply must be between 5.8V and 10.4V for proper operation. All digital
JUMP14 = 9V I/Os are regulated to 5V using U19 (REG101).
JUMP1 = EXT
JUMP2 = EXT
JUMP6 = 5V
JUMP7 = REF
External Power—3V JUMP17 = BUS (not used) In this mode, all power is supplied to the EVM via J5 or T3. The external
(typical jumper settings) JUMP13 = REG supply must be between 5.8V and 10.4V for proper operation. All digital
JUMP14 = 9V I/Os are regulated to 3V using U19 (REG101).
JUMP1 = EXT
JUMP2 = EXT
JUMP6 = 3V
JUMP7 = REF
External Power—Variable JUMP17 = Vraw In this mode, all the digital I/Os are referenced to the supply that is
Supply JUMP13 = BUS attached to either J5 or T3.
JUMP14 = 9V (not used)
JUMP1 = EXT
JUMP2 = EXT CAUTION
JUMP6 = 5V (not used)
JUMP7 = REG (ratiometric It is absolutely critical that the
mode) supply voltage does not
exceed 5.5V in this mode.
The supply is directly applied to devices with 5.5V absolute maximum
ratings. This mode of operation is useful when a device supply other
then 3.0V or 5.0V is required.
Table 5. Power-Supply Jumper Configuration #2
Mode Jumper Comment
Bus Power—5V JUMP17 = BUS In this mode, the USB bus completely powers the EVM. The USB bus is
JUMP13 = BUS regulated by the master (computer) to be 5V. This mode relies upon
JUMP14 = 9V (not used) external regulation. This mode is recommended only when an external
JUMP1 = BUS 9V supply is not available. If an external 9V supply is available, use
JUMP2 = BUS either External Power 5V mode or External Power 3V mode.
JUMP6 = 5V (not used)
JUMP7 = REG (ratiometric
mode, 5V supply)
Bus Power—3V JUMP17 = BUS (not used) In this mode, the USB bus completely powers the EVM. The regulator
JUMP13 = REG (U19, REG101) is used to generate a 3V supply for all digital I/O.
JUMP14 = BUS
JUMP1 = BUS
JUMP2 = BUS
JUMP6 = 3V
JUMP7 = REG (ratiometric
mode, 5V supply)
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3.7 Connecting External Power to the INA220EVM
The INA220 power supply (VS) operates over the range of 3V to 5.5V (see the INA220 product data
sheet). The default jumper position provides 5V to the INA220 from the USB-DIG-Platform. The power
from the USB-DIG-Platform can be changed to 3V 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 positon. The INA220
power supply (VS) operates over the range of 3V to 5.5V, so be careful to not exceed this range.
3.8 Connecting External Signals to the INA220EVM
The INA220 shunt and bus voltages are applied via 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 (26V max). The shunt
voltage is the difference between VIN– and VIN+ (320mV max). Refer to the INA220 data sheet for more
details
4 INA220 Software Overview
This section discusses how to install and use the INA220 software.
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4.1 INA220EVM Software Install
Follow these steps to install the INA220EVM software:
Step 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/.
Step 2. Find the file called setup.exe. Double-click the file to start the installation process.
Step 3. Follow the on-screen prompts to install the software.
Step 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) gives more detail regarding 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 10 shows how the software should appear if the EVM is
functioning properly.
Figure 10. INA220EVM Software—Functioning Properly
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Figure 11 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 9V power source. A second possible reason for this
problem is that there may be a problem with your 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 11. INA220EVM Software—No Communication with the USB DIG Platform
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Figure 12 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. Another possible cause of this issue it that the
INA220_Test_Board jumpers are set in the wrong position.
Figure 12. 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 you to access different features of the INA220.
The first four tabs are designed so that you can completely configure the device by stepping through the
tabs in order. Each of the tabs is intended to have an intuitive graphical interface that helps you gain a
better understanding of the device.
4.3.1 Overview Tab
This tab has the following controls:
• Turn the power supply on and off
• Set the I2C address
4.3.2 Config Tab
This tab has the following controls:
• Shunt voltage attenuator range (smallest range: 40mV; largest range: 320mV)
• 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 (16V and 32V): Note that the maximum bus voltage for the INA220 is
26V. 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 Calibrate 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
This 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
This 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 (that is, the register settings) can be saved or loaded using the EVM Controls
drop-down menu, as Figure 13 shows. The file that the configuration is saved into is a simple text file and
can be viewed with any text editor.
Figure 13. 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 14 illustrates. This
document is based on revision 1.0.35.
Figure 14. Current Software Revision
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Bill of Materials www.ti.com
5 Bill of Materials
Table 6 shows the parts list for the INA220_Test_Board.
Table 6. INA220_Test_Board Parts List
No. Quantity Value Ref Des Description Vendor Part Number
1 1 4.02k R5 Resistor, 4.02k, ROHM MCR03EZPFX4021
603
2 2 10k R3, R4 Resistor, 10k, 603 Yageo Corporation RC0603FR-0710KL
3 2 0ΩR1, R2 RES 0.0 OHM Panasonic - ECG ERJ-6GEY0R00V
1/8W 5% 0805
SMD
4 1 10mF C3 Capacitor, Kemet T491C106M016AT
Tantalum, 10uF,
16V, 6032
5 1 0.1mF C2 CAP .10UF 25V Kemet C0603C104M3VACTU
CERAMIC Y5V
0603
6 0 Optional/Not C1 0603-1206 — —
Installed Capacitor
7 1 LED D1 Diode, LED, Ultra Panasonic LNJ208R8ARA
Bright Diff, 603
8 1 DSUB25M J1 CONN D-SUB AMP/Tyco 5747842-4
PLUG R/A 25POS Electronics
30GOLD (With
Threaded Inserts
and Board locks)
9 3 N/A N/A SHUNT LP AMP/Tyco 881545-2
W/HANDLE 2 POS Electronics
30AU
10 5 JUMP3 cut to size JMP1-JMP5 CONN HEADER Samtec TSW-132-07-G-S
32POS .100" SGL
GOLD (4 per Strip)
11 4 Standoff None Standoffs, Hex , Keystone 2203
4-40 Threaded,
0.500" length,
0.250" OD,
Aluminum Iridite
Finish
12 4 Screw None SCREW MACHINE Building Fasteners PMSSS 440 0025 PH
PHIL 4-40X1/4 SS
13 11 Test point N/A 5018 SMD Test Keystone 5018
Point
14 3 2-pin connector T1, T2, T3 2-Position Terminal On-Shore ED300/2
Strip, Cage Clamp, Technology Inc
45°, 15A,
Dove-tailed
15 1 3-pin connector T4 3-Position Terminal On-Shore ED300/3
Strip, Cage Clamp, Technology Inc
45°, 15A,
Dove-tailed
20 INA220 Evaluation Module SBOU079A–July 2009–Revised February 2010
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