Texas Instruments INA232EVM Manuel utilisateur

User’s Guide

INA232EVM, INA234EVM and INA236EVM

ABSTRACT

This user’s guide describes the characteristics, operation, and use of the INA232, INA234 and INA236

evaluation modules (EVMs). These EVMs are designed to evaluate the performance of the INA232, INA234 and

INA236. Throughout this document, the terms evaluation board, evaluation module, and EVM are synonymous

with the INA232EVM, INA234EVM and INA236EVM. This document includes a schematic, reference printed

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

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INA232EVM, INA234EVM and INA236EVM 1

Table of Contents

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

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

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

2.2 Related Documentation From Texas Instruments.............................................................................................................. 4

3 Hardware................................................................................................................................................................................. 4

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

4 Operation.................................................................................................................................................................................5

4.1 Quick Start Setup............................................................................................................................................................... 5

4.2 EVM Operation...................................................................................................................................................................5

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...................................................................................................................................................................... 23

6.3 Bill of Materials.................................................................................................................................................................25

7 Revision History................................................................................................................................................................... 27

1 Trademarks

Chrome™ is a trademark of Google LLC.

Firefox™ is a trademark of Mozilla Foundation.

All trademarks are the property of their respective owners.

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2 Overview

The INA23x devices are digital power monitors with integrated 16-bit (INA232, INA236) and 12-bit (INA234)

delta-sigma ADCs specifically designed for current-sensing applications. The devices can measure a selectable

full-scale differential input of ±81.92 mV or ±20.48 mV across the shunt with common-mode voltage support

from –0.3 V to +48 V (–0.3 V to +28 V for INA234). The built-in digital accumulation calculates average power

and current if calibration register is programmed. The INA23x devices also have built-in diagnostics to indicate

system health accessible through a digital output pin, ALERT. The output can be interfaced with a multitude of

micro controllers (MCUs) with a standard I2C interface.

Table 2-1. Device Summary

PRODUCT

DIGITAL

PROTOCOL

ADC

RESOLUTION

MAX GAIN

ERROR

MAX OFFSET

VOLTAGE

INA232 I2C 16-bit 0.25% ±20 µV

INA234 I2C 12-bit 0.5% ±100 µV

INA236 I2C 16-bit 0.1% ±5 µV

2.1 Kit Contents

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

any component is missing.

Table 2-2. Kit Contents

ITEM QUANTITY

INA232EVM, INA234EVM OR

INA236EVM board

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

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INA232EVM, INA234EVM and INA236EVM 3

2.2 Related Documentation From Texas Instruments

This user's guide is available from the TI website under literature number SBOU264. 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

INA232 data sheet SBOSAA2

INA234 data sheet SBOS844

INA236 data sheet SBOSA81

3 Hardware

The EVM is an easy-to-use platform for evaluating the main features and performance of the INA23x. 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 INA23x installed.

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

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

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

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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.

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

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 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.

5. Click here to access the GUI in either the Chrome or Firefox browser.

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 Section 4.2.3.

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 Connected to SCB Controller

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

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

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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. Unzip

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

4.2.1.2 Firmware

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.

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 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:

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

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

b. Though hardware:

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

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

Click here to access the GUI through either the Chrome™ or Firefox™ browser.

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. Click the GUI Composer application (Figure 4-4) to launch the GUI from the web browser.

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Figure 4-4. GUI Composer Application

a. Follow the prompts to download the TI Cloud Agent and browser extension shown in Figure 4-5 for the

first-time GUI Composer setup. These prompts will appear after you close the README.md dialog.

Figure 4-5. TI Cloud Agent

4. Optionally, click the icon in the GUI Composer application (Figure 4-4) and follow the prompts to

download the GUI for offline use.

4.2.1.3.2 GUI to EVM Connection

To operate the GUI, follow these steps:

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

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 Hardware Connected message should be visible near the bottom-left corner

of the GUI as in Figure 4-6.

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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 window, as shown in Figure 4-7.

Figure 4-7. Device Connected

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

hardware COM ports under Options >> Serial Port, as shown in Figure 4-8.

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.

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4.2.2 GUI Operation

Set up, launch, and connect the GUI to the EVM per Section 4.2.1.3. 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 Section 4.2.1.3.2), as well

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

Figure 4-9. Home Tab Links

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, which may change based on the device connected.

Figure 4-10. Configuration Tool

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