Texas Instruments INA226 Bedienungsanleitung

User’s Guide

INA226EVM User’s Guide

ABSTRACT

This user’s guide describes the characteristics, operation, and use of the INA226 evaluation module (EVM).

This EVM is designed to evaluate the performance of the INA226. Throughout this document, the terms

evaluation board, evaluation module, and EVM are synonymous with the INA226EVM. This document includes a

schematic, reference printed circuit board (PCB) layouts, and a complete bill of materials (BOM).

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INA226EVM User’s Guide 1

Table of Contents

1 Trademarks..............................................................................................................................................................................2

2 Overview..................................................................................................................................................................................3

2.1 Kit Contents........................................................................................................................................................................3

2.2 Related Documentation From Texas Instruments.............................................................................................................. 3

3 Hardware................................................................................................................................................................................. 3

3.1 Features............................................................................................................................................................................. 4

4 Operation.................................................................................................................................................................................4

4.1 Quick Start Setup............................................................................................................................................................... 4

4.2 EVM Operation...................................................................................................................................................................4

5 Circuitry................................................................................................................................................................................. 19

5.1 Current Sensing IC...........................................................................................................................................................19

5.2 Input Signal Path..............................................................................................................................................................19

5.3 Digital Circuitry................................................................................................................................................................. 19

6 Schematics, PCB Layout, and Bill of Materials................................................................................................................. 20

6.1 Schematics.......................................................................................................................................................................20

6.2 PCB Layout...................................................................................................................................................................... 22

6.3 Bill of Materials.................................................................................................................................................................23

1 Trademarks

All trademarks are the property of their respective owners.

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2 Overview

The INA226 is a current shunt and power monitor with an I2C or SMBUS-compatible interface. The device

monitors both a shunt voltage drop and bus supply voltage. Programmable calibration value, conversion times,

and averaging, combined with an internal multiplier, enable direct readouts of current in amperes and power in

watts.

The INA226 senses current on common-mode bus voltages that can vary from 0 V to 36 V, independent of the

supply voltage. The device operates from a single 2.7-V to 5.5-V supply, drawing a typical of 330 µA of supply

current. The device is specified over the operating temperature range between -40°C and 125°C and features up

to 16 programmable addresses on the I2C-compatible interface.

Table 2-1. Device Summary

PRODUCT

DIGITAL

PROTOCOL

ADC

RESOLUTION

MAX GAIN

ERROR

MAX OFFSET

VOLTAGE

INA226 I2C 16-bit 0.1% ±10 µV

2.1 Kit Contents

Table 2-2 lists the contents of the EVM kit. Contact your nearest Texas Instruments Product Information Center if

any component is missing.

Table 2-2. Kit Contents

ITEM QUANTITY

INA226EVM test board 1

Note that this EVM requires the TI Sensor Control Board (SCB), which is sold separately.

2.2 Related Documentation From Texas Instruments

This user's guide is available from the TI website under literature number SBOU276. 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 are available from www.ti.com or 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. Table 2-3 lists documentation related to the EVM. Click the links in Table 2-3 for

further information. The device name links to the product web folder on www.ti.com. The literature number links

to the document PDF.

Table 2-3. Related Documentation

DOCUMENT TITLE

DOCUMENT

LITERATURE

NUMBER

INA226 data sheet SBOS547

INA226-Q1 data sheet SBOS743

Getting Started with Digital Power Monitors SBOA511

3 Hardware

The EVM is an easy-to-use platform for evaluating the main features and performance of the INA226. The EVM

supports current measurements up to 10 amps through the PCB, and includes a graphical user interface (GUI)

used to read and write device registers as well as view and save results data.

The EVM is intended to provide basic functional evaluation of the devices. The layout is not intended to be a

model for the target circuit, nor is it laid out for electromagnetic compatibility (EMC) testing. The EVM consists of

two printed-circuit boards (PCBs). The larger PCB is referred to as the EVM, and has the INA226 installed. The

smaller PCB is referred to as the SCB Controller, and is used to interface the EVM with the GUI.

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INA226EVM User’s Guide 3

3.1 Features

• GUI support to read and write device registers as well as view and save results data

• EVM detached from SCB for custom use cases

• Multiple EVM support with single SCB/GUI

• Conveniently powered from a common micro-USB connector through the SCB

4 Operation

4.1 Quick Start Setup

The following instructions describe how to set up and use the EVM.

1. Purchase an SCB if you do not already have one.

a. To use a PAMB Controller instead, see PAMB Compatibility.

2. Download this driver and install it as an administrator: https://www.ti.com/lit/zip/sbac253.

a. Follow the download prompts, a myTI account will be required.

b. Note that this driver is labeled as a PAMB driver, but is also used for the SCB.

3. Attach the EVM to the SCB Controller as shown in Figure 4-1.

a. Refer to Figure 4-2 when connecting multiple EVMs of the same type together.

4. Connect the EVM to the PC using the provided USB cable.

a. Insert the micro USB cable into the SCB Controller onboard USB receptacle J2.

b. Plug the other end of the USB cable into a PC.

5. Access the GUI from this link in either Chrome, Firefox, or Safari: https://dev.ti.com/gallery/info/

CurrentSensing/INA226EVM_GUI/.

6. Connect the GND reference of the external system to the GND node of the EVM (pin 1 of J1).

7. Provide a differential input voltage signal to the IN+ and IN– nodes by connecting the signal leads to J1 pin 5

or 6 and J1 pin 3 or 4 on the EVM as explained in Current Sensing Operation.

4.2 EVM Operation

To use the EVM with the SCB Controller (sold separately), connect the EVM as shown in Figure 4-1.

Figure 4-1. EVM (Left) Connected to SCB Controller (Right)

If using multiple EVMs, connect them as shown in Figure 4-2. Make sure to use a different I2C address for each

device. The GUI only supports up to 4 EVMs total.

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Figure 4-2. Multiple EVMs Connected to SCB Controller

4.2.1 Setup

4.2.1.1 Driver Installation

Download and install this driver: https://www.ti.com/lit/zip/sbac253. This is a one-time step per computer, and will

require a myTI account. Note that this driver is labeled as a PAMB driver, but is also used for the SCB. Unzip the

folder and run the .exe file with administrator privileges.

4.2.1.2 Firmware

Firmware updates will be pushed through the GUI if the previous driver was installed. Downloaded offline GUIs

will only update the SCB Controller with the latest firmware available at the time of download. To check for the

latest GUI or Firmware updates, launch the latest GUI version from the web browser.

4.2.1.2.1 Firmware Debug

If the firmware must be manually reinstalled for any reason, follow these steps to reinstall the firmware. Make

sure the EVM is connected to the SCB.

1. First, see if the GUI can program the firmware manually.

a. Plug in the SCB controller to the PC

b. Launch the GUI

c. It is possible that the MCU has already entered Device Firmware Update (DFU) mode. If so, the GUI

may notify you and try to update the firmware to the latest version.

d. If it does not update automatically, go to File > Program Device...

2. If step 1 is unsuccessful (or if the Program Device button is grayed out), manually configure the MCU on the

SCB Controller to be in DFU Mode. This can be done through either of the below methods with the SCB

Controller powered on:

a. Through software:

• Send the command 'bsl' on the SCB's USB Serial (COM) port.

b. Though hardware:

• For safety, turn off and disconnect all load sources and external voltages.

• While shorting the two test points labeled DFU (shown in Figure 4-3) with a pair of tweezers (or wire),

press and release the RESET button.

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INA226EVM User’s Guide 5

Figure 4-3. Test Points Used to Enter DFU Mode Manually

• If the PAMB board is being used instead, these test points are located near PK1 and PK2.

With the MCU in DFU mode, the firmware can now be uploaded through the method outlined in Step 1.

4.2.1.3 GUI Setup and Connection

You can access the GUI from this link in either Chrome, Firefox, or Safari: https://dev.ti.com/gallery/info/

CurrentSensing/INA226EVM_GUI/.

4.2.1.3.1 Initial Setup

To set up the GUI the first time:

1. Make sure that the previously mentioned driver was installed successfully to ensure that everything works

properly and that the GUI can update the EVM firmware, if necessary.

2. Check to make sure the EVM/SCB Controller unit is plugged into the PC, then go to the previously-provided

GUI link.

3. Open the GUI Composer application to launch the GUI from the web browser (see Figure 4-4).

Figure 4-4. GUI Composer Application

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a. The GUI link will bring up all versions of the GUI. TI recommends to launch the newest version available.

b. For first-time GUI Composer setup, follow the prompts to download the TI Cloud Agent and browser

extension (see Figure 4-5). These prompts will appear after you close the README.md dialog box.

Figure 4-5. TI Cloud Agent

4. To download the GUI for offline use, click the icon in the GUI Composer application and follow the

prompts (see Figure 4-4).

4.2.1.3.2 GUI to EVM Connection

To connect the GUI to the EVM, follow these steps:

1. Setup and launch the GUI as described in Initial Setup.

2. Check to make sure that the EVM connected to the GUI, then close the README.md file page to initiate the

connection. If successful, the text Hardware Connected should be visible near the bottom left corner of the

GUI.

Figure 4-6. Hardware Connected

a. A green indicator with the device type and the text DEVICE CONNECTED should also be visible near

the top left of the GUI.

Figure 4-7. Device Connected

b. If the text Hardware Connected and DEVICE CONNECTED do not show in the GUI, long-press the

RESET button on the EVM to try again.

i. If that option does not work, check different hardware COM ports under Options > Serial Port.

Figure 4-8. Change Serial Port

c. If the hardware still does not connect, make sure you are using the correct GUI/EVM combination.

i. If you are using the correct GUI/EVM combination, you may need to reprogram the firmware of the

SCB, as described in Firmware Debug.

ii. Many connectivity issues can be addressed by doing one of the following:

1. Long-press the RESET button on the EVM with the EVM and SCB connected to each other.

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INA226EVM User’s Guide 7

• Refreshing the GUI can also sometimes help this.

2. Connect the EVM to a different USB port.

• Avoid using long cables and USB hubs.

• If you are using a desktop PC, try a USB port on the back.

4.2.2 GUI Operation

Setup, launch, and connect the GUI to the EVM per GUI Setup and Connection. Refer to the sections below for

a description on how to use each page of the GUI.

4.2.2.1 Homepage Tab

The GUI starts out on the homepage tab. Click the (Home) icon on the menu to the left to return to the

homepage tab at any time.

From the homepage, you can easily confirm successful GUI to EVM connection (see GUI to EVM Connection),

as well as access helpful resources through the buttons on the bottom (see Figure 4-9).

Figure 4-9. Home Tab Links

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4.2.2.2 Configuration Tab

To do the initial setup for each connected EVM, click the (Configuration) icon on the menu to the left. Figure

4-10 shows an example of the configuration tool.

Figure 4-10. Configuration Tool

From this page you can set the number of EVMs you are using, and then for each EVM you can indicate the

physical hardware switch settings and configure your shunt and CURRENT_LSB. Below is a description of each

option and field on this page:

• Number of EVMs

– This setting is used to tell the GUI how many EVMs are connected to the SCB.

– Note, the SCB and GUI only support up to 4 INA226EVMs at a time.

– Changing this here also changes the same setting in the Results Data tab.

• Selected EVM

– This setting indicates which EVM you are currently changing settings for.

– This also selects the EVM that is connected to the Registers tab.

• Hardware Switch Settings

– Set these settings to match the physical switch settings on the EVM.

– Note, this setting needs to be set before changing any other settings on this page. The GUI will block the

other settings until this is set.

– Changing this here also changes the same setting in the Results Data tab.

• Shunt/Current Configuration

– This section is used to input shunt information as well as to help calculate the CURRENT_LSB and set the

CALIBRATION register. Here is a description of how to use each field:

• RSHUNT

– Input the value of the used shunt resister in mΩ.

• Max Expected Current

– Input the value of the maximum expected current across the shunt resistor in Amps.

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INA226EVM User’s Guide 9

– If the Max Expected Current field is left blank, then CALIBRATION can be adjusted manually, and

the tool will tell you the True Max Current that can be measured with the EVM.

• CURRENT_LSB

– This is the calculated CURRENT_LSB value in Amps. This field gets populated automatically from

the Max Expected Current field.

– This field can be changed manually if desired, and changes will filter downward.

• CALIBRATION

– Calculated value for CALIBRATION based off of RSHUNT and CURRENT_LSB. When this field

changes, the value is automatically written to the CALIBRATION register.

– This field can be changed manually if desired, and changes will filter downward.

– Changing this value from the register map page also changes it here.

• True CURRENT_LSB

– This is the actual CURRENT_LSB value in Amps back calculated from the CALIBRATION register

with the given shunt resistor value.

– This is the value used for calculations in the Results Data section.

• True Max Current

– This is the maximum measurable current in Amps based off of the VSHUNT and CURRENT

registers, using RSHUNT and the True CURRENT_LSB for calculations.

• Required Sensing Range

– This shows the required sensing range to measure the Max Expected Current with the specified

shunt resistor.

– If a Max Expected Current is not specified, then the True Max Current field will be used instead.

4.2.2.3 Registers Tab

To view and edit the device registers, click the (Registers) icon on the menu to the left. The Registers tab will

look like the one shown in Figure 4-11.

Figure 4-11. GUI Registers Tab

From this page, you can read and write device registers on the EVM. Here are some important notes:

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