Texas Instruments INA228 Manual de usuario
User’s Guide
INA228, INA229, INA237, INA238, and INA239 EVM User’s
Guide
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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Table of Contents
1 Trademarks..............................................................................................................................................................................2
General Texas Instruments High Voltage Evaluation (TI HV EMV) User Safety Guidelines............................................... 3
2 Overview..................................................................................................................................................................................5
2.1 Kit Contents........................................................................................................................................................................5
2.2 Related Documentation From Texas Instruments.............................................................................................................. 6
3 Hardware................................................................................................................................................................................. 6
3.1 Features............................................................................................................................................................................. 6
4 Operation.................................................................................................................................................................................7
4.1 Quick Start Setup............................................................................................................................................................... 7
4.2 EVM Operation...................................................................................................................................................................7
5 Circuitry................................................................................................................................................................................. 21
5.1 Current Sensing IC...........................................................................................................................................................21
5.2 Input Signal Path..............................................................................................................................................................21
5.3 Digital Circuitry................................................................................................................................................................. 21
6 Schematics, PCB Layout, and Bill of Materials................................................................................................................. 22
6.1 Schematics.......................................................................................................................................................................22
6.2 PCB Layout...................................................................................................................................................................... 26
6.3 Bill of Materials.................................................................................................................................................................28
7 Revision History................................................................................................................................................................... 31
1 Trademarks
All trademarks are the property of their respective owners.
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General Texas Instruments High Voltage Evaluation (TI HV EMV) User Safety Guidelines
WARNING
Always follow TI's set-up 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://ti.com/
customer support 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 non-conductive work surface.
f. Use adequately insulated clamps and wires to attach measurement probes and instruments. No
freehand testing whenever possible.
2. Electrical Safety:
a. As a precautionary measure, it is always good engineering practice to assume that the entire EVM may
have fully accessible and active high voltages.
b. 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.
c. With the EVM confirmed de-energized, proceed with required electrical circuit configurations, wiring,
measurement equipment hook-ups and other application needs, while still assuming the EVM circuit and
measuring instruments are electrically live.
d. Once EVM readiness is complete, energize the EVM as intended.
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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.
3. Personal Safety
a. Wear personal protective equipment e.g. latex gloves or safety glasses with side shields or protect EVM
in an adequate lucent plastic box with interlocks from accidental touch.
Limitation for safe use:
EVMs are not to be used as all or part of a production unit.
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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 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 < 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 2-1. 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
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
INA228EVM, INA229EVM, INA237EVM,
INA238EVM, OR INA239EVM test board
1
Sensor Control Board (SCB) 1
USB cable 1
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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 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
INA228 data sheet SLYS021
INA228-Q1 data sheet SLYS022
INA229 data sheet SLYS023
INA229-Q1 data sheet SLYS024
INA237 data sheet SBOSA20
INA237-Q1 data sheet SBOSA27
INA238 data sheet SLYS025
INA238-Q1 data sheet SLYS026
INA239 data sheet SLYS027
INA239-Q1 data sheet SLYS028
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 INA228, INA229,
INA237, INA238, or INA239. 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 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.
3.1 Features
• GUI support to read and write device registers as well as view and save results data
• Detachable EVM for custom use cases
• Multiple EVM support with single SCB/GUI
• Conveniently powered from a common micro-USB connector
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4 Operation
4.1 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.
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.
2. 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.
3. 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.
4. Access the GUI from this link in either Chrome, Firefox, or Safari: 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 Current Sensing Operation.
4.2 EVM Operation
To use the EVM with the included SCB Controller, 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 chip select/address
for each device. The GUI only supports one EVM/device type at a time, up to 4 EVMs total.
Figure 4-2. Multiple EVMs Connected to SCB Controller
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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
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
latest GUI version from the web browser.
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. 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.
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.
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4.2.1.3 GUI Setup and Connection
The GUI can be accessed from this link in either Chrome, Firefox, or Safari: https://dev.ti.com/gallery/info/
4910879/INA228_229_237_238_239EVM_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. 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 such as the one shown in
Figure 4-4.
Figure 4-4. GUI Composer Application
a. The GUI link will bring up all versions of the GUI, it is recommended 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 4-5. These prompts will appear after you close the README.md dialog.
Figure 4-5. 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 4-4) and following the prompts.
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. With the EVM plugged in, after launching 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
4-6.
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, as shown in Figure 4-7.
Figure 4-7. 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 that doesn't work, check 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.
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 can also sometimes help this.
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.
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