Texas Instruments INA228EVM Manuale utente

SBOU241A–April 2020–Revised June 2020

INA228, INA229, INA237, INA238, and INA239 EVM User’s Guide

User's Guide

SBOU241A–April 2020–Revised June 2020

INA228, INA229, INA237, INA238, and INA239 EVM User’s

Guide

This user’s guide describes the characteristics, operation, and use of the INA228, INA229, INA237,

INA238, and INA239 evaluation modules (EVMs). These EVMs are designed to evaluate the performance

of the INA228, INA229, INA237, INA238, and INA239. Throughout this document, the terms evaluation

board, evaluation module, and EVM are synonymous with the INA228EVM, INA229EVM, INA237EVM,

INA238EVM, and INA239EVM. This document includes a schematic, reference printed-circuit board (PCB)

layouts, and a complete bill of materials (BOM).

Trademarks

All trademarks are the property of their respective owners.

WARNING

General Texas Instruments High Voltage Evaluation (TI HV EVM) User Safety Guidelines

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1 General Texas Instruments High Voltage Evaluation (TI HV EVM) User Safety Guidelines

Always follow TI’s setup and application instructions, including use of all interface components within their

recommended electrical rated voltage and power limits. Always use electrical safety precautions to help

ensure your personal safety and those working around you. Contact TI's Product Information Center

http://support/ti./com for further information.

Save all warnings and instructions for future reference.

WARNING

Failure to follow warnings and instructions may result in personal injury,

property damage or death due to electrical shock and burn hazards.

The term TI HV EVM refers to an electronic device typically provided as an open framed, unenclosed

printed circuit board assembly. It is intended strictly for use in development laboratory environments,

solely for qualified professional users having training, expertise and knowledge of electrical safety risks in

development and application of high voltage electrical circuits. Any other use and/or application are strictly

prohibited by Texas Instruments. If you are not suitable qualified, you should immediately stop from further

use of the HV EVM.

1. Work Area Safety

a. Keep work area clean and orderly.

b. Qualified observer(s) must be present anytime circuits are energized.

c. Effective barriers and signage must be present in the area where the TI HV EVM and its interface

electronics are energized, indicating operation of accessible high voltages may be present, for the

purpose of protecting inadvertent access.

d. All interface circuits, power supplies, evaluation modules, instruments, meters, scopes and other

related apparatus used in a development environment exceeding 50Vrms/75VDC must be

electrically located within a protected Emergency Power Off EPO protected power strip.

e. Use stable and nonconductive work surface.

f. Use adequately insulated clamps and wires to attach measurement probes and instruments. No

freehand testing whenever possible.

2. Electrical Safety

As a precautionary measure, it is always a good engineering practice to assume that the entire EVM

may have fully accessible and active high voltages.

a. De-energize the TI HV EVM and all its inputs, outputs and electrical loads before performing any

electrical or other diagnostic measurements. Revalidate that TI HV EVM power has been safely

de-energized.

b. With the EVM confirmed de-energized, proceed with required electrical circuit configurations,

wiring, measurement equipment connection, and other application needs, while still assuming the

EVM circuit and measuring instruments are electrically live.

c. After EVM readiness is complete, energize the EVM as intended.

WARNING

While the EVM is energized, never touch the EVM or its electrical

circuits, as they could be at high voltages capable of causing electrical

shock hazard.

www.ti.com

General Texas Instruments High Voltage Evaluation (TI HV EVM) User Safety Guidelines

SBOU241A–April 2020–Revised June 2020

INA228, INA229, INA237, INA238, and INA239 EVM User’s Guide

3. Personal Safety

a. Wear personal protective equipment (for example, latex gloves or safety glasses with side shields)

or protect EVM in an adequate lucent plastic box with interlocks to protect from accidental touch.

Limitation for safe use:

EVMs are not to be used as all or part of a production unit.

Overview

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INA228, INA229, INA237, INA238, and INA239 EVM User’s Guide

2 Overview

The INA228, INA229, INA237, INA238, and INA239 devices are digital power monitors with integrated 20-

bit (INA229 and INA228) and 16-bit (INA237, INA238, and INA239) delta-sigma ADCs specifically

designed for current-sensing applications. The devices can measure a full-scale differential input of

±163.84 mV across the shunt with common-mode voltage support from –0.3 V to +85 V. For the INA228

and INA229, built-in digital accumulation calculates average power, internal die temperature, energy, and

charge accumulation. For the INA237, INA238, and INA239, built-in digital accumulation calculates

average power and internal die temperature. All devices also have built in diagnostics to indicate system

health accessible through a digital output pin, ALERT. The devices operate from a single supply of 2.7 V

to 5.5 V, drawing < 1-mA current during operation and with < 10-µA current during shutdown. The output

can be interfaced with a multitude of microcontrollers (MCUs) with a standard 4-wire SPI interface

(INA229 and INA239) or with a standard I2C interface (INA228, INA237, and INA238).

Table 1. INA228, INA229, INA237, INA238, and INA239 Device Summary

PRODUCT DIGITAL

PROTOCOL ADC

RESOLUTION MAX GAIN

ERROR MAX OFFSET

VOLTAGE

INA228 I2C 20-bit 0.1% ±2 µV

INA229 SPI 20-bit 0.1% ±2 µV

INA237 I2C 16-bit 0.25% ±50 µV

INA238 I2C 16-bit 0.25% ±10 µV

INA239 SPI 16-bit 0.25% ±10 µV

2.1 Kit Contents

Table 2 lists the contents of the EVM kit. Contact the nearest Texas Instruments Product Information

Center if any component is missing.

Table 2. Kit Contents

Item Quantity

INA228EVM, INA229EVM, INA237EVM,

INA238EVM, OR INA239EVM test board 1

USB cable 1

2.2 Related Documentation From Texas Instruments

This user's guide is available from the TI website under literature number SBOU241. 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 3 lists documentation related to the EVM.

Click the links in Table 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 3. Related Documentation

Document Title Document Literature

Number

INA228-Q1 data sheet SLYS022

INA229-Q1 data sheet SLYS024

INA237-Q1 data sheet SBOSA27

INA238-Q1 data sheet SLYS026

INA239-Q1 data sheet SLYS028

www.ti.com

Hardware

SBOU241A–April 2020–Revised June 2020

INA228, INA229, INA237, INA238, and INA239 EVM User’s Guide

3 Hardware

The EVM is an easy-to-use platform for evaluating the main features and performance of the INA228,

INA229, INA237, INA238, or INA239. The EVM supports current measurements up to 10 amps, and

includes a graphical user interface (GUI) used to read and write device registers.

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 2 PCBs. The smaller PCB is referred to as the EVM, and has either the INA228, INA229,

INA237, INA238, or INA239 installed. The larger PCB is referred to as the PAMB Controller, and is used

to interface the EVM with the GUI.

3.1 Features

• GUI support to read and write device registers

• Detachable EVM for custom use cases

• Conveniently powered from a common micro-USB connector

4 Operation

4.1 Quick Start Setup

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

Step 1. Download and install this driver: http://www.ti.com/lit/zip/sbac253

Step 2. Attach the EVM to the PAMB Controller as shown in Figure 1.

Step 3. Set the switches to EVM mode:

1. For the INA229 and INA239: Make sure that SW1 is set to CS3.

2. For the INA228, INA237, and INA238: Make sure that both SW0 and SW1 are set to

GND.

Step 4. Connect the EVM to a PC using a USB cable.

1. Insert the micro USB cable into the PAMB Controller onboard USB receptacle J2.

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

Step 5. Access the GUI from one of these links in either Chrome or Firefox:

1. INA228EVM: https://dev.ti.com/gallery/info/4910879/INA228EVM_GUI/ver/1.0.0/

2. INA229EVM: https://dev.ti.com/gallery/info/4910879/INA229EVM_GUI/ver/1.0.0/

3. INA237EVM and INA238EVM:

https://dev.ti.com/gallery/info/4910879/INA237_238EVM_GUI/ver/1.0.0/

4. INA239EVM: https://dev.ti.com/gallery/info/4910879/INA239EVM_GUI/ver/1.0.0/

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

Step 7. Provide a differential input voltage signal to the Vin+ and Vin– nodes by connecting the signal

leads to J1 pin 5 or 6 and J1 pin 3 or 4 on the EVM as explained in Section 4.2.2.

Operation

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4.2 EVM Operation

To use the EVM with the included PAMB Controller, connect the EVM as shown in Figure 1.Make sure to

set SW0 and SW1 as instructed in Section 4.1,Step 3.

Figure 1. EVM on PAMB Controller

4.2.1 Setup

4.2.1.1 Driver Installation

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

Unzip the folder and run the .exe file with administrator privileges.

4.2.1.2 Firmware

The firmware comes preinstalled on the PAMB Controller. Firmware updates will be pushed through the

GUI (requires previous driver to be installed). Downloaded offline GUIs may check for GUI/Firmware

updates depending on the version.

www.ti.com

Operation

SBOU241A–April 2020–Revised June 2020

INA228, INA229, INA237, INA238, and INA239 EVM User’s Guide

4.2.1.2.1 Firmware Debug

If the firmware gets corrupted or must be manually reinstalled for any reason, follow these steps to

reinstall the firmware.

1. Configure the MCU on the PAMB Controller to be in Device Firmware Update (DFU) Mode.

a. It is possible that the MCU has already entered DFU mode. If so, the GUI will notify you and try to

update the firmware to the latest version after the GUI is connected to the PC.

b. DFU mode can be entered manually through one of the following methods while the PAMB

Controller is powered on:

• Through software:

– Send the command 'bsl' on the PAMB's USB Serial (COM) port.

• Though hardware (with the EVM removed):

– Short the two test points near PK1 and PK2 of the header pins (shown in Figure 2) with a

pair of tweezers (or wire) while pressing the RESET button.

Figure 2. Test Points Used to Enter DFU Mode Manually

2. With the MCU in DFU mode, the firmware can now be uploaded through one of the following methods:

• Through the GUI:

– Plug in the PAMB Controller to a PC via the USB port and launch the GUI. DFU mode should

be automatically detected, and the firmware will be uploaded automatically.

• Through the USB Bootstrap Loader (BSL) scripter tool and batch file:

– Download the firmware package and BSL scripter tool from the EVM page, or use the following

links:

• INA228EVM: http://www.ti.com/lit/zip/sboc600

• INA229EVM: http://www.ti.com/lit/zip/slyc150

• INA237EVM and INA238EVM: http://www.ti.com/lit/zip/sboc601

• INA239EVM: http://www.ti.com/lit/zip/slyc151

– Unzip the firmware folder and run the .bat file.

4.2.1.3 GUI Setup and Usage

The GUI can be accessed from these links in either Chrome or Firefox:

• INA228EVM: https://dev.ti.com/gallery/info/4910879/INA228EVM_GUI/ver/1.0.0/

• INA229EVM: https://dev.ti.com/gallery/info/4910879/INA229EVM_GUI/ver/1.0.0/

• INA237EVM and INA238EVM: https://dev.ti.com/gallery/info/4910879/INA237_238EVM_GUI/ver/1.0.0/

• INA239EVM: https://dev.ti.com/gallery/info/4910879/INA239EVM_GUI/ver/1.0.0/

Operation

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INA228, INA229, INA237, INA238, and INA239 EVM User’s Guide

4.2.1.3.1 Initial Setup

To set up the GUI the first time, use the following instructions:

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. With the EVM/PAMB Controller unit plugged into the PC, go to the previously-provided GUI link.

3. On the EVM, make sure to set the switches to EVM mode:

1. For the INA229 and INA239: Make sure that SW1 is set to CS3.

2. For the INA228, INA237, and INA238: Make sure that both SW0 and SW1 are set to GND.

4. To launch the GUI from the web browser, click the GUI Composer application to open the GUI

Composer window shown in Figure 3.

Figure 3. GUI Composer Application Window

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

browser extension shown in Figure 4. These prompts will appear after you close the README.md

dialog.

Figure 4. TI Cloud Agent

www.ti.com

Operation

SBOU241A–April 2020–Revised June 2020

INA228, INA229, INA237, INA238, and INA239 EVM User’s Guide

5. Optionally, the GUI can be downloaded for offline use by clicking the icon in the GUI Composer

window shown in Figure 3.

4.2.1.3.2 GUI Operation

To operate the GUI, follow these steps:

1. Connect to and launch the GUI as described in Section 4.2.1.3.1.

2. With the EVM connected to the GUI, close the README.md file page and search for the Hardware

Connected text near the bottom-left hand corner of the GUI as in Figure 5.

Figure 5. Hardware Connected

a. If Hardware Connected does not show in the bottom-left hand corner of the GUI, check different

hardware COM ports under Options >> Serial Port, as shown in Figure 6.

Figure 6. Change Serial Port

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

3. Click the Registers icon shown in Figure 7.

Figure 7. Registers Page Icon

4. You can now interact with the EVM from the Register page. For questions about a register or register

bit field, select the icon. For more questions about registers, check the data sheet.

Operation

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4.2.2 Current Sensing Operation

The EVM allows the user to either emulate the voltage developed across a sense resistor based on a

given set of system conditions by applying a differential voltage across the IN+ and IN– terminals directly,

or to connect the device inputs to an external shunt. Optionally, a surface-mount technology (SMT) shunt

resistor can be soldered across the pads of R1, and these inputs can be connected in series with the

external system and load current. There are 2 terminals each for IN+ (J1 pins 5 and 6) and IN– (J1 pins 3

and 4) for convenience.

To configure a measurement evaluation without a shunt resistor, follow these steps:

1. Connect a differential voltage across the IN+ and IN– terminals as shown in Figure 8.

a. If the differential voltage supply is a floating supply, connect a –0.3-V to 85-V common-mode

voltage (leave powered off until finished setting up) to the inputs by connecting the positive lead of

the external voltage source to either the IN+ or IN– terminal. This action effectively raises the

absolute common-mode voltage of the input pins. Make sure that the differential voltage plus or

minus the common-mode voltage does not go out of the –0.3-V to 85-V range.

Figure 8. IN+ and IN– Wiring Without a Shunt Resistor

2. Connect the VBUS terminal (J1 pin 2) to the desired bus voltage (likely either IN+ or IN–).

3. Connect the source ground to the GND terminal (J1 pin 1).

4. Power on the system, and observe the device states and outputs through the GUI.

To configure a measurement evaluation with a shunt resistor, follow these steps:

1. Connect a shunt resister by doing either of the following:

a. Solder a 2512 resistor across the pads of R1 that connects the IN+ and IN– inputs.

b. Connect an external shunt across the IN+ and IN– terminals of J1, preferably across pins 4 and 5,

as shown in Figure 9.

i. If an external shunt is being used, make the connections such that the sensing location is

across the shunt and there will be no high current on the sensing path. See the TI Precision

Labs - Current Sense Amplifiers: Shunt Resistor Layout video for more information.

2. Connect the IN+ and IN– terminals in series with the load while powered off.

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