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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System Setup www.ti.com
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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INA220EVM Hardware Setup www.ti.com
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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www.ti.com INA220EVM Hardware Setup
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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INA220EVM Hardware Setup www.ti.com
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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