Texas Instruments INA229 User manual

User’s Guide

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

Guide

Mitch Morse

ABSTRACT

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).

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INA228, INA229, INA237, INA238, and INA239 EVM User’s Guide 1

Table of Contents

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

2 General Texas Instruments High Voltage Evaluation (TI HV EVM) User Safety Guidelines............................................ 3

3 Overview..................................................................................................................................................................................5

3.1 Kit Contents........................................................................................................................................................................5

3.2 Related Documentation From Texas Instruments.............................................................................................................. 6

4 Hardware................................................................................................................................................................................. 6

4.1 Features............................................................................................................................................................................. 6

5 Operation.................................................................................................................................................................................7

5.1 Quick Start Setup............................................................................................................................................................... 7

5.2 EVM Operation...................................................................................................................................................................7

6 Circuitry................................................................................................................................................................................. 18

6.1 Current Sensing IC...........................................................................................................................................................18

6.2 Input Signal Path..............................................................................................................................................................18

6.3 Digital Circuitry................................................................................................................................................................. 18

7 Schematics, PCB Layout, and Bill of Materials................................................................................................................. 19

7.1 Schematics.......................................................................................................................................................................19

7.2 PCB Layout...................................................................................................................................................................... 23

7.3 Bill of Materials.................................................................................................................................................................25

8 Revision History................................................................................................................................................................... 28

1 Trademarks

All trademarks are the property of their respective owners.

Table of Contents www.ti.com

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

Guidelines

WARNING

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

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3. Personal Safety

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

protect the 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.

General Texas Instruments High Voltage Evaluation (TI HV EVM) User Safety Guidelines www.ti.com

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3 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 selectable full-scale differential input of ±163.84 mV or

±40.96 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 < 1.1-mA current

during operation and with < 5-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 3-1. Device Summary

PRODUCT

DIGITAL

PROTOCOL

ADC

RESOLUTION

MAX GAIN

ERROR

MAX OFFSET

VOLTAGE

INA228 I2C 20-bit 0.05% ±1 µV

INA229 SPI 20-bit 0.05% ±1 µV

INA237 I2C 16-bit 0.3% ±50 µV

INA238 I2C 16-bit 0.1% ±5 µV

INA239 SPI 16-bit 0.1% ±5 µV

3.1 Kit Contents

Table 3-2 lists the contents of the EVM kit. Contact the nearest Texas Instruments Product Information Center if

any component is missing.

Table 3-2. Kit Contents

ITEM QUANTITY

INA228EVM, INA229EVM, INA237EVM,

INA238EVM, OR INA239EVM test board

Sensor Control Board (SCB) 1

USB cable 1

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3.2 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 3-3 lists documentation related to the EVM. Click the links in Table 3-3 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 3-3. 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

4 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 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 either the INA228, INA229,

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

interface the EVM with the GUI.

4.1 Features

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

• Detachable EVM for custom use cases

• Conveniently powered from a common micro-USB connector

Overview www.ti.com

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5 Operation

5.1 Quick Start Setup

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

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

2. Attach the EVM to the SCB Controller as shown in Figure 5-1.

a. Refer to Figure 5-2 when connecting multiple EVMs of the same type together.

3. Connect the EVM to a 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.

4. Access the GUI from this link in either Chrome or Firefox: https://dev.ti.com/gallery/info/4910879/

INA228_229_237_238_239EVM_GUI/.

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

6. 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 Section 5.2.2.

5.2 EVM Operation

To use the EVM with the included SCB Controller, connect the EVM as shown in Figure 5-1.

Figure 5-1. EVM Connected to SCB Controller

If using multiple EVMs, connect them as shown in Figure 5-2. Make sure to use a different chip select/address

for each device. The GUI only supports one EVM/device type at a time.

Figure 5-2. Multiple EVMs Connected to SCB Controller

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5.2.1 Setup

5.2.1.1 Driver Installation

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

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

5.2.1.2 Firmware

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

(requires previous driver to be 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

GUI from the web browser.

5.2.1.2.1 Firmware Debug

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

firmware.

1. 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 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 that does not work (or if the "Program Device" button is grayed out), manually configure the MCU on the

SCB Controller to be in Device Firmware Update (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:

• Short the two test points labeled "DFU" (shown in Figure 5-3) with a pair of tweezers (or wire) while

pressing the RESET button.

Figure 5-3. 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.

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5.2.1.3 GUI Setup and Usage

The GUI can be accessed from this link in either Chrome or Firefox: https://dev.ti.com/gallery/info/4910879/

INA228_229_237_238_239EVM_GUI/.

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

3. To launch the GUI from the web browser, click the GUI Composer application shown in Figure 5-4.

Figure 5-4. GUI Composer Application

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

extension shown in Figure 5-5. These prompts will appear after you close the README.md dialog.

Figure 5-5. TI Cloud Agent

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

(shown in Figure 5-4) and following the prompts.

5.2.1.3.2 GUI Operation

To operate the GUI, follow these steps:

1. Connect to and launch the GUI as described in Section 5.2.1.3.1.

2. With the EVM connected to the GUI, close the README.md file page to initiate the connection. If successful,

"Hardware Connected" should be visible near the bottom left corner of the GUI as in Figure 5-6.

Figure 5-6. 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, as shown in Figure 5-7.

Figure 5-7. Device Connected

b. If "Hardware Connected" and "DEVICE CONNECTED" do not show in the GUI, check different hardware

COM ports under Options >> Serial Port, as shown in Figure 5-8.

Figure 5-8. 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.

3. To view and edit the device register map, click the (registers) icon on the menu on the left.

a. From this page, you can read and write register settings on the EVM. For questions about a register or

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