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.

SBOU079A–July 2009–Revised February 2010 INA220 Evaluation Module

This datasheet has been downloaded fromhttp://www.digchip.com at this page

Overview

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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, 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

2INA220 Evaluation Module SBOU079A–July 2009–Revised February 2010

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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 (800) 477-8924 or the

Product Information Center at (972) 644-5580. 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.

SBOU079A–July 2009–Revised February 2010 INA220 Evaluation Module

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

I C

Interface

System Setup

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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

4INA220 Evaluation Module SBOU079A–July 2009–Revised February 2010

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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

I2C_SDA_ISO

I2C_SCK_ISO

I2C_SDA_ISO

I2C_SCK_ISO

Vin+

Vin-

SCL

SDA

10uF

4.02k

LED

Vdut

10k

Burr Brown Products

LOGO2

Burr Brown Products

LOGO1

0.1uF

JMP1

Vs_Ext

T_STRIP2

SDA

SCL

Vs Ext Vdut

GND

Scope_GND

Vin -

Vin + C1

0.1uF

T_STRIP2

T3 T_STRIP2

GND

JMP5

JMP4

I2C_SDA_ISO

I2C_SCK_ISO

JMP3

JMP2

DAC_A

DAC_B

DAC_A and DAC_B used for Test with USB DAQ Platform only.

Vin+

Vin-

Gnd 7

SCL

SDA

AO 2

A1 1

VBUS

INA220

T_STRIP3

VBus

VBus A0

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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

SBOU079A–July 2009–Revised February 2010 INA220 Evaluation Module

System Setup

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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

6INA220 Evaluation Module SBOU079A–July 2009–Revised February 2010

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USB DIG EVM

External

Power

USB Connection

from Computer

USB

Adjustable

Regulator

Power

Switching

3.3V

Regulator

Buffers and

Latches

TUSB3210

8052 C

with USB Interface

and UART

Reset Button

and Power-On

Reset

8Kx8-Byte

EEPROM

(2.7V to

5.5V)

(2.7V to 5.5V)

DUT

Switched Power

I C

SPI

Control Bits

Measure Bits

3.3V

SmC

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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.

SBOU079A–July 2009–Revised February 2010 INA220 Evaluation Module

INA220EVM Hardware Setup

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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.

8INA220 Evaluation Module SBOU079A–July 2009–Revised February 2010

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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

SBOU079A–July 2009–Revised February 2010 INA220 Evaluation Module

INA220EVM Hardware Setup

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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

10 INA220 Evaluation Module SBOU079A–July 2009–Revised February 2010

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