Texas Instruments INA260EVM-PDK User manual

User’s Guide
INA260EVM-PDK (Rev A)
ABSTRACT
This user's guide describes the characteristics, operation, and use of the INA260EVM-PDK (Rev A) hardware.
This user's guide discusses how to set up and configure the software and hardware, and reviews the device
operation. Throughout this document, the terms evaluation board, evaluation module, EVM PCB, and EVM are
synonymous with the INA260EVM. The terms PDK, kit, and EVM kit are synonymous with the INA260EVM-PDK.
This user's guide also includes information regarding operating procedures, the input and output connections, an
electrical schematic, printed circuit board (PCB) layout drawings, and a parts list for the EVM.
Table of Contents
1 Overview..................................................................................................................................................................................2
1.1 INA260EVM-PDK Contents............................................................................................................................................... 2
1.2 INA260EVM-PDK Features................................................................................................................................................3
1.3 Related Documentation from Texas Instruments............................................................................................................... 5
2 INA260EVM-PDK Hardware....................................................................................................................................................6
2.1 SM-USB-DIG Platform Description.................................................................................................................................... 7
2.2 INA260EVM PCB Description............................................................................................................................................ 8
2.3 EVM Digital Inputs and Outputs....................................................................................................................................... 10
3 INA260EVM-PDK (Rev A) Setup...........................................................................................................................................11
3.1 One-Time GUI Software Installation.................................................................................................................................12
3.2 INA260EVM Jumper Settings.......................................................................................................................................... 14
3.3 Connecting the Hardware................................................................................................................................................ 15
3.4 System Power-Up............................................................................................................................................................ 17
4 INA260EVM GUI Software.................................................................................................................................................... 23
4.1 Configuration Tool............................................................................................................................................................ 24
4.2 Results Bar.......................................................................................................................................................................27
4.3 Graph Tool........................................................................................................................................................................27
4.4 Registers Tool.................................................................................................................................................................. 28
5 INA260EVM Documentation.................................................................................................................................................29
5.1 Schematic........................................................................................................................................................................ 30
5.2 PCB Layout...................................................................................................................................................................... 31
5.3 Bill of Materials.................................................................................................................................................................32
6 Revision History................................................................................................................................................................... 35
Trademarks
Windows® is a registered trademark of Microsoft Corporation.
All trademarks are the property of their respective owners.
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1 Overview
The INA260 is a high- or low-side current sensor, power, and voltage monitor with a 2-mΩ precision integrated
shunt resistor and I2C interface. The INA260 offers programmable conversion times and averaging modes that
enable high resolution measurements of the current, voltage, and power dissipation of the monitored source.
The INA260EVM-PDK, which consists of the INA260EVM and SM-USB-DIG controller board, is a platform
used to evaluate the features and performance of the INA260 under various signal and supply conditions.
This document gives a general overview of the INA260EVM-PDK and describes the features and functions to
consider when using this evaluation module.
1.1 INA260EVM-PDK Contents
Table 1-1 summarizes the contents of the INA260EVM kit. Figure 1-1 shows all included hardware. Contact the
Texas Instruments customer support center if any component is missing.
Note
This EVM kit requires the INA260EVM GUI software, which is available for download through the
INA260 design & development folder. TI recommends users check the INA260 product folder on the TI
website at www.ti.com to verify that they have the latest versions of the related software.
Table 1-1. INA260EVM Kit Contents
ITEM QUANTITY
INA260EVM PCB test board 1
SM-USB-DIG platform PCB 1
USB extender cable 1
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Figure 1-1. Hardware Included with the INA260EVM Kit
1.2 INA260EVM-PDK Features
• USB-powered; no external power supply is required
• Support for full ±15-A input current range and 36-V common-mode voltage range of the INA260
• EVM includes placeholders for transient voltage suppression (TVS) devices to protect the INA260 inputs from
excessively high common-mode voltages
• Digital host controller included
• Intuitive GUI software supports all major INA260 functional modes and simplifies device configuration
Note
To protect against voltage transients that may exceed the absolute maximum ratings, TI highly
recommends installing the TVS devices (D3 and D4, as shown in Figure 1-2) with a minimum power
rating of 1000 W to clamp the input voltages to less than 36 V.
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Figure 1-2. Placeholders for TVS Devices
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1.3 Related Documentation from Texas Instruments
The following documents provide information regarding Texas Instruments' integrated circuits used in the
assembly of the INA260EVM. This user's guide is available from the TI web site under literature number
SBOU180. 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 may be available from www.ti.com, or call the Texas
Instruments' Literature Response Center at [phone] or the Product Information Center at [phone].
When ordering, identify the document by both title and literature number.
Table 1-2. Related Documentation
DOCUMENT
LITERATURE
NUMBER
INA260 product data sheet SBOS656
SM-USB-DIG platform user guide SBOU098
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2 INA260EVM-PDK Hardware
Figure 2-1 shows the overall system setup for the INA260EVM-PDK. To monitor the power source, connect the
power source to the EVM input terminals. The computer runs the GUI software that enables power to the INA260
and communicate with the device. The user can send commands through the USB port of the computer to the
SM-USB-DIG board to translate these commands into I2C format before sending the commands to the EVM.
With power enabled, the INA260 responds to these I2C commands by sending the requested data back to the
SM-USB-DIG board over the I2C. The SM-USB-DIG converts the received data to USB format and sends the
data back to the computer, where it is then appropriately processed and displayed to the user.
INA260EVM
PCB
POWER
GND
VSUPPLY ALERT
SDA
SCL
SM-USB-DIG
Controller
T2
T1
ILOAD
LOAD
GND
POWER
USB DATA
VBUS
11.1 A
6.02 V
66.82 W
ILOAD
VBUS
PLOAD
INA260EVM GUI
Figure 2-1. INA260EVM-PDK Hardware Setup
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2.1 SM-USB-DIG Platform Description
Figure 2-2 shows the block diagram for the SM-USB-DIG platform. This platform is a general-purpose data
acquisition system that is used on other Texas Instruments evaluation modules. The details of operation are
included in a separate document, SBOU098 (available for download at www.ti.com).
The TUSB3210 is the primary control device for the SM-USB-DIG Platform. The TUSB3210 is an 8052
microcontroller that converts data received on the built-in USB interface to the I2C, SPI, and other serial digital
I/O patterns. This EVM uses the I2C interface of the TUSB3210 to control the INA260.
Power supply for the SM-USB-DIG is derived from the USB interface. The SM-USB-DIG includes an onboard
low dropout (LDO) regulator that uses the 5-V USB supply from the computer to generate a 3.3-V supply, which
is then used to power all the active circuitry on board. The 3.3-V regulated supply can also be used to power
the EVM PCB. In fact, the raw 5-V USB supply as well as the 3.3-V regulated supply are routed to a 2-input
power MUX on the SM-USB-DIG, the TPS2115A, whose output terminates at the VDUT pin of the 10-pin EVM
connector, intended to be used as the EVM power supply. The user can select between the 5-V and 3.3-V
options for VDUT through the INA260EVM GUI software.
TUSB3210
8052 Cm
with USB Interface
and UART
8Kx8-byte
EEPROM
+3.3V
VUSB
+5V
Power-On Reset SM USB DIG Platform
To Test Board
To Computer and Power Supplies
Power
Switching
Switched
Power
USB Bus
from
Computer
USB Power
+5.0V
+3.0V
V
(H-Z, 3.3V, or 5V)
DUT
Buffers and
Level Translators
I C/SPI
Control and
Measure Bits
2
+3.3V
Regulator
Figure 2-2. SM-USB-DIG Platform Block Diagram
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2.2 INA260EVM PCB Description
Figure 2-3 depicts a block diagram of the INA260EVM PCB highlighting the power supplies, analog inputs, and
digital I/O signals.
T2
T1
J1 J4
J2, J3
INA260
VDUT Supply
GND
A0, A1
I2C interface
VBUS
IN+
IN-
Figure 2-3. INA260EVM Block Diagram
The EVM PCB requires minimal instrumentation to be operated. In fact, the only pieces of required equipment
not included in the kit are a ( Windows® 7) computer and an input current source. All other inputs are supplied by
the SM-USB-DIG board, via the 10-pin connector socket, J4. Table 2-1 lists the pinout for J4.
Table 2-1. Signal Definition of J4 on INA260EVM Board
PIN ON J4 SIGNAL DESCRIPTION
10 I2C_SCL I2C clock signal (SCL)
9 CTRL/MEAS4 GPIO: control output or measure input
8 I2C_SDA1 I2C data signal (SDA)
7 CTRL/MEAS5 GPIO: control output or measure input
6 SPI_DOUT1 SPI data output (MOSI)
5 VDUT Switchable DUT power supply: 3.3 V, 5 V, Hi-Z
(disconnected)(1)
4 SPI_CLK SPI clock signal (SCLK)
3 GND Power return (GND)
2 SPI_CS1 SPI chip-select signal ( CS)
1 SPI_DIN1 SPI data input (MISO)
(1) When VDUT is Hi-Z, all digital I/Os are Hi-Z as well.
2.2.1 EVM Power Supply
The INA260EVM PCB uses the VDUT and GND lines from the SM-USB-DIG (via J4) as the high and low supply
voltages for the INA260. As noted in Table 2-1, the available supply voltages for VDUT are 5 V and 3.3 V. The
EVM supply voltage is user-selectable through the GUI. Place the 1-µF ceramic capacitor (C2) in close proximity
to the INA260 supply pin (U1) to provide adequate decoupling to VDUT for power supply rejection at higher
frequencies.
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2.2.2 EVM Analog Inputs
The INA260 accepts two kinds of analog inputs: namely, a current through the internal shunt resistor and a
voltage between the VBUS pin and GND. Configure the INA240 in the GUI to digitize either one or both of these
inputs in serial order. The high current lug connectors designated T1 and T2 are the terminations of the internal
2-mΩ shunt resistor, therefore connect T1 and T2 in series with the input current source and load (see Figure
2-1). The INA260 is a bidirectional device and thus current can flow through the shunt resistor in either direction.
CAUTION
Do Not Exceed the Absolute Maximum Ratings (see the INA260 datasheet)!
To help ensure safe operating conditions, do not exceed the following electrical ratings:
• 15 A between connectors T1 and T2 in either direction
• 36 Vdc between T1 and GND
• 36 Vdc between T2 and GND
WARNING
Potential Burn Hazard!
To minimize risk of burn, do not touch U1 (the INA260 device) when input current is present.
Temperatures higher than 50°C are possible.
The VBUS input of the INA260 is accessible through pin 2 of header J1. Pins 1 and 3 of J1 are connected to IN+
and IN–, respectively. Note that the VBUS input is independent of the current input (that is, the VBUS input can be
applied with or without a load), and the INA260 provides an accurate voltage reading. However, the device also
passively multiplies the measured values of VBUS and input current to generate a power value. For the power
calculation to be meaningful, VBUS must represent the voltage drop created by the input current across the load.
Therefore, for accurate load power measurements, short the VBUS pin to IN+ or IN– (on header J1) depending
on the location of the load. For example, for the arrangement in Figure 2-1, short VBUS to IN– for an accurate
load power calculation.
The EVM PCB also includes placeholders for the TVS devices to protect the INA260 inputs from excessively
high common-mode voltages. The pads for these uninstalled devices, D3 and D4, are located on the bottom side
of the EVM PCB and are suitable for DO-214AB package.
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2.3 EVM Digital Inputs and Outputs
The only digital input signals required to operate the INA260 are the 2-bit I2C device address (A[1:0]), serial
clock (SCL), and serial data (SDA), which is a bidirectional pin and thus also an output. The device address
bits can each assume one of four values: GND, VS, SDA or SCL, resulting in 16 possible target addresses
summarized in Table 2-2. The values of A0 and A1 must be set using jumpers J2 and J3, respectively.
Table 2-2. INA260 I2C Address Configuration
A1 A0 TARGET ADDRESS
GND GND 1000000
GND VS+ 1000001
GND SDA 1000010
GND SCL 1000011
VS+ GND 1000100
VS+ VS+ 1000101
VS+ SDA 1000110
VS+ SCL 1000111
SDA GND 1001000
SDA VS+ 1001001
SDA SDA 1001010
SDA SCL 1001011
SCL GND 1001100
SCL VS+ 1001101
SCL SDA 1001110
SCL SCL 1001111
The SM-USB-DIG drives the SCL and SDA through the J4 connector socket. These are open-drain inputs
and the EVM contains pullup resistors to drive these inputs high when the corresponding SM-USB-DIG digital
outputs are in tri-state. Both fast (1 kHz to 400 kHz) and high-speed (1 kHz to 2.94 MHz) I2C modes are
supported.
The outputs of the INA260 include SDA and ALERT, both of which are routed to J4 and are readable from the
GUI. The GUI includes support for both over- and underlimit as well as conversion ready indicator modes of the
ALERT pin. The state of the ALERT pin can be read from either the GUI or the onboard LED indicator.
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3 INA260EVM-PDK (Rev A) Setup
CAUTION
Components of the INA260EVM-PDK are susceptible to damage by electrostatic discharge (ESD).
Customers are advised to observe proper ESD handling precautions when unpacking and handling
the EVM, including the use of a grounded wrist strap at an approved ESD workstation.
The INA260EVM-PDK (Rev A) hardware setup involves the following sequence of operations:
1. Perform a one-time GUI software installation
2. Configure the EVM jumpers
3. Connect the hardware
4. Power up the EVM and input source
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3.1 One-Time GUI Software Installation
The GUI software must be installed on a computer running Windows XP or later. Windows 7 is the recommended operating system.
Note
For the GUI text to be rendered correctly, the text size under Control Panel >> Appearance and Personalization >> Display (shown in Figure
3-1) must be set to Smaller - 100%.
Figure 3-1. Recommended Display Settings
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Make sure the hardware is not connected to the computer. Download the INA260EVM GUI from the INA260 Tools & Software folder. Extract the contents
of the downloaded .zip file and run Setup_INA260EVM.exe. Follow the on-screen instructions provided in Figure 3-2 to complete the software installation.
1 2
3 4
56 7 8
Figure 3-2. INA260EVM GUI Installation
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3.2 INA260EVM Jumper Settings
Figure 3-3 shows the default jumper configuration for the INA260EVM and Table 3-1 explain the purpose of each
jumper. Ensure that the jumpers are installed in the correct positions, based on the required test conditions.
Figure 3-3. INA260EVM Default Jumper Settings
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Table 3-1. INA260EVM Test Board Jumper Functions
JUMPER DEFAULT PURPOSE
J1 IN+ This jumper selects whether the VBUS pin on the INA260 is connected to the
IN+ or IN– pin; see Section 2.2.2 for details.
J2 GND This jumper sets the A0 character of the 2-character I2C device address; see
Section 2.3 for details.
J3 GND This jumper sets the A1 character of the 2-character I2C device address; see
Section 2.3 for details.
3.3 Connecting the Hardware
WARNING
To minimize risk of potential electrical shock hazard, be sure the EVM is full deenergized.
Before connecting the boards, make sure the high current lug connectors (T1 and T2) are tightly secured to
the EVM PCB for low contact resistance. To minimize risk of potential electrical shock hazard, deenergize EVM
followed by use of a screw-driver, while clasping the nut on the PCB bottom side with a crescent wrench.
Note
It may be necessary to uninstall the nylon standoffs near the lug connectors before manipulating the
fasteners to avoid damaging them.
Connect the INA260EVM to the SM-USB-DIG board in the proper orientation, as shown in Figure 3-4. Make sure
that the two connectors are completely pushed together; loose connections can cause intermittent operation.
Figure 3-4. INA260EVM and SM-USB-DIG Connected in Proper Orientation
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Next, with the output disabled, connect the input current source to the EVM via T1 and T2, as shown in Figure
3-5.
Note
The lug connectors can accommodate wire sizes up to #6-AWG.
Also be sure to connect the low-side terminal of the input current source to EVM ground (GND) using one of the
test points. This step is important to obtain accurate VBUS measurements.
Lastly, connect the SM-USB-DIG to the computer, using the included USB extender cable if necessary. At this
point the SM-USB-DIG powers on, but the EVM does not.
The power supply to the EVM must be enabled from the GUI.
Figure 3-5. SM-USB-DIG Powers on When Connected to a Computer
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3.4 System Power-Up
Launch the INA260EVM GUI software. The Power button on the GUI is enabled by default, which allows the
POWER LED on the EVM to immediately light up. The light shows that the EVM PCB is receiving power.
To input
current
source low
side.
Figure 3-6. INA260EVM Powers Up Following the GUI Launch
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Additionally, the supply voltage (VDUT) is set to 3.3 V by default, but the user can select the 5-V option, if
necessary (see Figure 3-7).
Figure 3-7. VDUT Selection
With the INA260 powered on, the user can enable the analog input sources.
Section 4 discusses the GUI configuration and data collection using this setup.
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3.2 INA260EVM Jumper Settings
Figure 3-3 shows the default jumper configuration for the INA260EVM and Table 3-1 explain the purpose of each
jumper. Ensure that the jumpers are installed in the correct positions, based on the required test conditions.
Figure 3-3. INA260EVM Default Jumper Settings
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Table 3-1. INA260EVM Test Board Jumper Functions
JUMPER DEFAULT PURPOSE
J1 IN+ This jumper selects whether the VBUS pin on the INA260 is connected to the
IN+ or IN– pin; see Section 2.2.2 for details.
J2 GND This jumper sets the A0 character of the 2-character I2C device address; see
Section 2.3 for details.
J3 GND This jumper sets the A1 character of the 2-character I2C device address; see
Section 2.3 for details.
3.3 Connecting the Hardware
WARNING
To minimize risk of potential electrical shock hazard, be sure the EVM is full deenergized.
Before connecting the boards, make sure the high current lug connectors (T1 and T2) are tightly secured to
the EVM PCB for low contact resistance. To minimize risk of potential electrical shock hazard, deenergize EVM
followed by use of a screw-driver, while clasping the nut on the PCB bottom side with a crescent wrench.
Note
It may be necessary to uninstall the nylon standoffs near the lug connectors before manipulating the
fasteners to avoid damaging them.
Connect the INA260EVM to the SM-USB-DIG board in the proper orientation, as shown in Figure 3-4. Make sure
that the two connectors are completely pushed together; loose connections can cause intermittent operation.
Figure 3-4. INA260EVM and SM-USB-DIG Connected in Proper Orientation
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