Texas Instruments INA700EVM Manuel utilisateur

User’s Guide

INA700EVM User’s Guide

ABSTRACT

This user’s guide describes the characteristics, operation, and use of the INA700 evaluation modules (EVMs).

These EVMs are designed to evaluate the performance of the INA700. Throughout this document, the terms

evaluation board, evaluation module, and EVM are synonymous with the INA700EVM. This document includes a

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

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INA700EVM User’s Guide 1

Table of Contents

1 Overview..................................................................................................................................................................................3

1.1 Kit Contents........................................................................................................................................................................3

1.2 Related Documentation From Texas Instruments.............................................................................................................. 4

2 Hardware................................................................................................................................................................................. 4

2.1 Features............................................................................................................................................................................. 4

3 Operation.................................................................................................................................................................................5

3.1 Quick Start Setup............................................................................................................................................................... 5

3.2 EVM Operation...................................................................................................................................................................5

4 Circuitry................................................................................................................................................................................. 15

4.1 Current Sensing IC...........................................................................................................................................................15

4.2 Input Signal Path..............................................................................................................................................................15

4.3 Digital Circuitry................................................................................................................................................................. 15

5 Schematics, PCB Layout, and Bill of Materials................................................................................................................. 16

5.1 Schematics.......................................................................................................................................................................16

5.2 PCB Layout...................................................................................................................................................................... 18

5.3 Bill of Materials.................................................................................................................................................................19

Trademarks

my.TI™ is a trademark of Texas Instruments.

All trademarks are the property of their respective owners.

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1 Overview

The INA700 is a digital power monitor with integrated 16-bit delta-sigma ADC specifically designed for space

constrained current-sensing applications. The device includes an integrated copper shunt capable of up to 10

continuous amps with common-mode voltage support from –0.3 V to +40 V. The device can measure internal die

temperature and power consumption for the monitored bus. The INA700 also has built-in diagnostic capabilities

to indicate system health accessible through a digital output pin, ALERT. The device operates from a single

supply of 2.7 V to 5.5 V, drawing less than 1.1 mA of current during operation over temperature, and <

5-µA current during shutdown. Users can interface the output with a multitude of microcontrollers (MCUs) in a

standard I2C interface.

Table 1-1. Device Summary

PRODUCT

DIGITAL

PROTOCOL

ADC

RESOLUTION

MAX GAIN

ERROR

MAX OFFSET

CURRENT

INA700 I2C16-bit ±0.65% ±2 mA

1.1 Kit Contents

Table 1-2 lists the contents of the EVM kit. Contact Texas Instruments' customer support center if any

component is missing.

Table 1-2. Kit Contents

ITEM QUANTITY

INA700EVM 1

Note

This EVM requires the TI Sensor Control Board (SCB) that is sold separately.

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INA700EVM User’s Guide 3

1.2 Related Documentation From Texas Instruments

This user's guide is available from the TI website under literature number SBOU285. Any letter appended to the

literature number corresponds to the document revision that is current at the time of the writing of this document.

When ordering, identify the document by both title and literature number. Table 1-3 lists documentation related to

the EVM. Click the links in Table 1-3 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 1-3. Related Documentation

DOCUMENT TITLE DOCUMENT LITERATURE

NUMBER

INA700 data sheet SBOSAB4

2 Hardware

The INA700EVM is an easy-to-use platform that can evaluate the main features and performance of the INA700

device. The EVM supports current measurements up to 10 continuous 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 device. The layout is not laid out for

electromagnetic compatibility (EMC) testing. The EVM consists of a single printed circuit board (PCB). The

PCB may also be referred to as the EVM in this document, and has the INA700 installed. A separate PCB may

be used in conjunction with the EVM, known as the SCB Controller, and is used to interface the EVM with the

GUI.

2.1 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 or GUI

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

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3 Operation

3.1 Quick Start Setup

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

1. Purchase a 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.

a. Follow the download prompts. An account on my.TI™ on-line information services is required.

b. Take note that this driver is labeled as a PAMB driver and is also used for the SCB.

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

a. Refer to Figure 3-2 when connecting multiple EVMs of the same type together.

4. Connect the EVM to the PC using a 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/INA700EVM_GUI/.

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

7. Ensure the load current is disabled, then place the INA700 IN+ and IN– nodes to the load line 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.

3.2 EVM Operation

To use the EVM with the SCB Controller (sold separately), connect the EVM as shown in Figure 3-1.

Figure 3-1. EVM (Left) Connected to SCB Controller (Right)

If using multiple EVMs, connect them as shown in Figure 3-2. Make sure to use a different address for each

device. The GUI only supports one EVM/device type at a time and up to four EVMs total.

Figure 3-2. Multiple EVMs Connected to SCB Controller

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INA700EVM User’s Guide 5

3.2.1 Setup

3.2.1.1 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 an account on my.TI™ on-line information services. Note that this driver is labeled as a PAMB driver and

is also used for the SCB. Unzip the folder and run the .exe file with administrator privileges.

3.2.1.2 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 latest GUI version from the web browser.

3.2.1.2.1 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. Check to see if the GUI can program the firmware manually.

a. Plug the SCB controller into the PC

b. Launch the GUI

c. Check to see if the MCU 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 the GUI 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 DFU Mode through the software or hardware:

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 3-3) with a pair of tweezers (or wire),

press and release the RESET button.

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

With the MCU in DFU mode, upload the firmware through the method outlined in step 1.

3.2.1.3 GUI Setup and Connection

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

CurrentSensing/INA700EVM_GUI/.

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3.2.1.3.1 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 or SCB Controller unit is plugged into the PC, then go to the previously-

provided GUI link.

• Ensure that the EVM is connected to the SCB before plugging the SCB into a USB port.

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

Figure 3-4. GUI Composer Application

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 shown in Figure 3-5. Close the README.md dialog box to see these prompts.

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INA700EVM User’s Guide 7

Figure 3-5. TI Cloud Agent

4. Optionally, click the icon in the GUI Composer application (Figure 3-4) and follow the prompts to

download the GUI for offline use.

3.2.1.3.2 GUI to EVM Connection

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

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

a. Make sure to connect the EVM to the SCB before powering on

2. Close the README.md file page to initiate a connection between the EVM and the GUI. If successful, the

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

Figure 3-6. Hardware Connected

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

the top-left corner of the GUI

Figure 3-7. Device Connected

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

button on the EVM to try again.

i. If the long-press reset does not work, check different hardware COM ports under Options

➞

Serial

Port, as shown in Figure 3-8.

Figure 3-8. Change Serial Port

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

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

the SCB 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.

• Refreshing the GUI may also help

2. Connect the EVM to a different USB port

• Avoid using long cables and USB hubs

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

3.2.2 GUI Operation

Set up, 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.

3.2.2.1 Home Tab

The GUI starts out on the Home tab. To get back to this page from anywhere, click the (Home) icon on the

menu on the left.

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.

Figure 3-9. Home Tab Links

3.2.2.2 Registers Tab

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

will look similar to the one shown in Figure 3-10.

Figure 3-10. GUI Registers Tab

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INA700EVM User’s Guide 9

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

• Use the Selected EVM drop-box to choose which device to work with on the Registers page

– Note, changing this here also changes the same setting for the Configuration tab

– Functionally, this button sets the default read and write address in the MCU and then reads all register

values back to update the Registers page. Note that if data is collected at high frequency, this may cause

a minor delay in the data collection. For optimal performance, set the device settings before you start

collecting data.

• By default, all changes are automatically written to the device. If desired, you can change the Immediate

Write setting to Deferred Write to only allow writing when you are ready.

– You can modify writable register values from any of these methods:

• Through the widget settings in the Field View section on the right

• Changing the Value field directly with either hex or decimal values

• Double-clicking any individual bit

• Remember that turning on Auto Read will only update registers in the Registers page and not the plots in the

Results Data section

– Leaving Auto Read on while collecting data for plots can interfere with data collection timing

• For questions about a register or register bit field, click the icon

– For even more questions about registers, check the data sheet

• For convenience, register settings can be saved and loaded back to any device with the same Registers

page. To save or relaod register settings, go to File

➞

Figure 3-11. Save and Load Register Settings

– Press the Read All Registers button after loading the data to update the Registers page with the actual

device values in case the loaded registers were not compatible with the connected device

3.2.2.3 Results Data Tab

To view and collect results data over time, clickthe (Results Data) icon to open the Results Data page. Figure

3-12 shows part of the Results Data page for reference.

Figure 3-12. Results Page and Settings

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