Texas Instruments EZShunt INA740 Manuel utilisateur
EVM User's Guide: INA780, INA740, INA745, INA780A, INA780B,
INA781, INA740A, INA740B, INA741, INA745A, INA745B, INA746,
INA780-781EVM, INA740-INA741EVM, INA745-746EVM
EZShunt™ Digital Current and Power Monitors
Description
The EZShunt™ Digital Power Monitor evaluation
modules demonstrate the performance and features
of the INA780, INA781, INA740, INA741, INA745, and
INA746. Paired with the Sensor Control Board (SCB),
the graphical user interface (GUI composer) provides
the device power and digital setup and evaluation with
real-time data capture. The EVM has I2C inputs.
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/GUI
• Conveniently powered from a common micro-USB
connector through the SCB
• Includes high power lugs and hardware for quick
high current evaluation (only available for Version
A with fully released devices)
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1 Evaluation Module Overview
1.1 Introduction
This user’s guide describes the characteristics, operation, and use of the EZShunt™ digital power monitor
EVMs (evaluation modules), specifically EVMs for the INA740, INA741, INA745, INA746, INA780, and INA781.
Throughout this document, the terms evaluation board, evaluation module and EVM are synonymous with
the INA740AEVM, INA740BEVM, INA741EVM, INA745AEVM, INA745BEVM, INA746EVM, INA780AEVM,
INA780BEVM, and INA781EVM. This document includes a schematic, reference printed-circuit board (PCB)
layouts, and a complete bill of materials (BOM).
The EZShunt digital power monitors integrate 20-bit (INA741, INA746, and INA781) and 16-bit (INA740,
INA745, and INA780) delta-sigma ADCs that measure an internal current sensing element capable of varying
continuous current at common-mode voltages, as high as +85 V, that are independent of the supply. These
devices can automatically calculate and report current, bus voltage, die temperature, power, energy, and charge
accumulation. These devices also have built-in diagnostic capabilities to indicate system health accessible
through a digital output pin, ALERT. These devices operate from a single supply of 2.7 V to 5.5 V, drawing
less than 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.
WARNING
NOTICE: The INA740BEVM (SENS108A-002) does not currently ship with INA740B populated.
To evaluate INA740B, order functionally equivalent INA740AEVM (SENS108E1-001) or
functionally similar INA741EVM (SENS108E1-003) or solder INA740B onto the INA740BEVM.
1.2 Kit Contents
Table 1-1 lists the contents of the EVM kit. Contact Texas Instruments Customer Support if any component is
missing.
Table 1-1. Kit Contents
ITEM QUANTITY
INA740AEVM, INA740BEVM,
INA741EVM, INA745AEVM,
INA745BEVM, INA741EVM,
INA780AEVM, INA780BEVM, OR
INA781EVM test board
1
Note that this EVM requires the TI Sensor Control Board (SCB), which is sold separately.
Currently, there are two versions to the EVMs: version E1 and version A. This is because not all device variants
are being fully released at the same time. Version A is functionally and thermally equivalent to E1 except for the
following:
• Device U1 is part of the full release inventory and performs according to the corresponding data sheet
• Header J4 and shunt H5 are included to optionally open the ALERT bus
• Lugs MP1 and MP2 are included with associated hardware MP3, MP4, MP5, and MP6
Until all devices have been fully released, this document covers both versions.
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1.3 Specification
The EZShunt digital power monitors included in the EVMs pertaining to this document can report current,
bus voltage, power, temperature, energy, and charge, while also providing robust diagnostic capabilities and a
corresponding ALERT pin.
GND
16 – bit
ADC
V
I
Common-mode Voltage
(-0.1 V to 85 V)
TI Device
IS+
IS-
±0.5% Oscillator
VBUS
IN+
IN-
SH+
SH-
Power
Current
Bus Voltage
Temperature
Energy
Charge
Alert_Diag
Shunt TC
Compensation
Registers
V
II2C / SMBus
Interface
A0
A1
ALERT
SDA
SCL
0.1 µF
VS
Supply Voltage
(2.7 V to 5.5 V)
Figure 1-1. Functional Block Diagram for 16-bit digit Device Variant
1.4 Device Information
The devices are under evaluation (U1) digital power monitors with integrated EZShunt technology, an internal
current sense element. The devices are thermally packaged resistors with a digital power monitor where the
Kelvin sense connection is determined so the designer does not have to worry about the Kelvin force and sense
connections of a shunt resistor.
Table 1-2. Device Summary
PRODUCT
NOMINAL
PACKAGE
RESISTANCE
MAX INPUT
COMMON MODE
VOLTAGE
DIGITAL
PROTOCOL
ADC
RESOLUTION
INA740A 1 mΩ 85 V I2C 16-bit
INA740B I2C 16-bit
INA741 I2C 20-bit
INA745A 900 µΩ 40 V I2C 16-bit
INA745B I2C 16-bit
INA746 I2C 20-bit
INA780A 560 mΩ 85 V I2C 16-bit
INA780B I2C 16-bit
INA781 I2C 20-bit
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2 Hardware
This EVM is an easy-to-use platform for evaluating the main features and performance of the INA740,
INA741, INA745, INA746, INA780, or INA781. The INA780-INA781EVM supports measurable, continuous
current levels up to 50-A over temperature, while the INA740-INA741EVM and INA745-INA746EVM support
25-A over temperature. The measurable full-scale current range of these devices is a function of layout, ambient
temperature, and current duration. Please refer to the data sheet for more information. EVM software 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 the layout 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. The smaller PCB is
referred to as the SCB Controller, and is used to interface the EVM with the GUI.
2.1 Quick Start Setup
The following instructions describe how to set up and use the EVM.
1. Purchase an SCB if there is not one.
2. Download this driver and install 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 2-1.
a. Refer to Figure 2-2 when connecting multiple EVMs of the same type together.
4. 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.
5. Access the GUI from this link in either Chrome, Firefox, or Safari: https://dev.ti.com/gallery/info/
CurrentSensing/EZShunt-EVM-GUI/.
6. Connect the GND reference of the external system to the GND node of the EVM (any test point or clip
labeled "GND").
7. Verify the load current source is disabled, then connect the EVM MP1 (IS+) and MP2 (IS-) nodes in-series to
the load line with properly current rated cables as explained inCurrent Sensing Operation.
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2.2 EVM Operation
To use the EVM with the SCB Controller (sold separately), connect the EVM as shown in Figure 2-1.
Figure 2-1. EVM (Bottom) Connected to SCB Controller (Top)
If using multiple EVMs, then connect them as shown in Figure 2-2. Make sure to use a different chip select/
address for each device. The GUI only supports one EVM or device type at a time; up to four EVMs total.
Figure 2-2. Multiple EVMs Connected to SCB Controller
2.2.1 Current Sensing Operation
These EZShunt digital power monitor EVMs come equipped with internal shunt resistors and are out-of-the box
ready to measure up to 25 A (INA74x devices) or 50 A continuous current (INA78x devices) up to the rated
input common-mode voltage. The EVMs have exposed pads (MP1 and MP2) for IS+ and IS- pins to run current
through. MP1 and MP2 are designed for terminal connector lugs compatible with a 1/4 inch stud, such as the
LAMA6-14-QY.
Note that the VBUS pin is electrically tied to the IS+ net
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2.2.1.1 Detailed Setup
To configure a measurement evaluation, follow these steps:
1. Gather a voltage source and/or load/current source capable of the desired voltage and current.
2. With instruments powered off, connect the load current carrying lines to the MP1 (IS+) and MP2 (IS-)
terminals.
a. WARNING
When measuring current, first make sure that the equipment (EVM, wires, connectors, and
so on) can support the amperage and power dissipation. Secondly, make sure that the
current flowing through IS+ and IS- terminals does not exceed 25 A for INA74x nor 50 A
for INA78x devices over temperature. Failure to do so can result in damage to the EVM, or
personal injury. See data sheet for more information on safe operating conditions.
Do not touch high voltage terminals.
The EVM and wires connected to IS+ and IS- nets can get hot.
3. Connect the system ground to the GND terminal (J1 pin 1) or any other GND labeled test point on the EVM.
4. Power on the system, and observe the device states and outputs through the GUI.
2.3 Circuitry
This section summarizes the EVM subsystems and their components.
2.3.1 Current Sensing IC
U1 is the main INA current-sensing device. The specific U1 variant is notated on the PCB via the population of a
resistor in silkscreen table.
For the SENS108 PCB (INA740-INA741EVM), the 001, 002, and 003 variants have U1 populated with INA740A,
INA740B, and INA741 respectively.
For the SENS109 (INA745-INA746EVM), the 001, 002, and 003 variants have U1 populated with INA745A,
INA745B, and INA746 respectively.
For the SENS119 PCB (INA780-INA781EVM), the 001, 002, and 003 variants have U1 populated with INA780A,
INA780B, and INA781 respectively.
C1 and C2 are bypass capacitors that are placed near the sensor to help mitigate power supply noise and
provide current quickly to the device when needed. LED D1 with current limiting resistor R7 are used to indicate
when the EVM is powered on.
The device pins can be monitored directly through the labeled test points and vias.
2.3.2 Input Signal Path
This section describes the circuitry of the input signal path.
The EZShunt digital power monitors provide an integrated shunt (IS+ to IS-), Kelvin sense connections (SH+ to
SH-), and ADC differential input pins (IN+ and IN-). Thus, these devices have the ability to implement differential
input filtering if desired in between the SH+/SHI pins and the IN+/IN- pins; however, to maximize thermal
capability the input filters cannot be added to the EVM as of now because Kelvin sense pins are electrically tied
to internal ADC input pins. If current filtering is necessary, then a user can configure longer conversion times
and/or higher number of averages for the current register.
The VBUS pin is also electrically tied to the IS+ net to also optimize thermal performance.
All that is necessary to provide an input signal to U1 is to simply insert the IS+ (MP1) and IS- (MP2) nets
in-series of the EVM with any current carrying wire provided the current and voltage are within EVM limits.
2.3.3 Digital Circuitry
This section describes the digital circuitry around the device.
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2.3.3.1 I2C
J2 and J3 are the main header pins that connect the digital and power pins to the SCB Controller or other EVMs.
J3 connects to the EVM/SCB on the top, while J2 connects to more EVMs on the bottom. R5 and R6 are used
as pullup resistors for the main digital IO pins.
SW0 (sets A0 pin) and SW1 (sets A1 pin) set the I2C address of the device. This can be useful when using
the EVM with a custom controller (other than the SCB Controller), or when connecting multiple EVMs together.
Currently the SCB Controller and GUI are set up to use four EVMs at a time.
R8 is used as a pullup resistor for the ALERT pin, which is routed to both J2 and J3. LED D2 and current limiting
resistor R7 are used to indicate when the ALERT has triggered.
General Texas Instruments High Voltage Evaluation (TI HV EVM) 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 can 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 suitably 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 observers must be present anytime circuits are energized.
c. Effective barriers and signage must be present in the area where the TI HV EVM and the interface
electronics are energized, indicating operation of accessible high voltages can 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, a good engineering practice is to assume that the entire EVM can have
fully accessible and active high voltages.
b. De-energize the TI HV EVM and all the inputs, outputs and electrical loads before performing any
electrical or other diagnostic measurements. Re-validate 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.
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d. Once EVM readiness is complete, energize the EVM as intended.
WARNING
While the EVM is energized, never touch the EVM or the electrical circuits, as the circuits
and EVM can be at high voltages capable of causing electrical shock hazard.
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 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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3 Software
3.1 Setup
3.1.1 Driver Installation
Download and install this driver: https://www.ti.com/lit/zip/sbac253. This is a one-time step per computer, and
requires 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.
3.1.2 Firmware
Firmware updates is pushed through the GUI (requires previous driver to be installed). Downloaded offline GUIs
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.
3.1.2.1 Firmware Debug
If the firmware must be manually reinstalled for any reason, then follow the steps below 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. Launch the GUI.
b. Plug in the SCB controller to the PC.
c. Check to see if the MCU entered Device Firmware Update (DFU) mode. If so, then the GUI notifies the
user and attempts 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 be in DFU Mode through 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 3-1) with a pair of tweezers (or wire),
press and release the RESET button.
Figure 3-1. Test Points Used to Enter DFU Mode Manually
With the MCU in DFU mode, upload the firmware through the method outlined in Step 1.
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3.1.3 GUI Setup and Connection
Access the GUI from this link in either Chrome, Firefox, or Safari: https://dev.ti.com/gallery/info/CurrentSensing/
EZShunt-EVM-GUI/.
3.1.3.1 Initial Setup
To set up the GUI for the first time:
1. Make sure that the previously mentioned driver was installed successfully to verify 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.
a. Verify that the EVM is connected to the SCB before plugging the SCB into a USB port.
3. Click the GUI Composer application (see Figure 3-2) to launch the GUI from the web browser.
Figure 3-2. GUI Composer Application
a. The GUI link 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 3-3. Close the README.md dialog box to see these prompts.
Figure 3-3. TI Cloud Agent
4. Optionally, click the icon in the GUI Composer application (see Figure 3-2) and follow the prompts to
download the GUI for offline use.
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Ce manuel convient aux modèles suivants
14
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