National Semiconductor INA260 User manual

INA260EVM-PDK
INA260 Evaluation Module and Product Demonstration Kit
User's Guide
Literature Number: SBOU180
November 2016

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Table of Contents
Contents
1 Overview............................................................................................................................. 5
1.1 INA260EVM-PDK Contents............................................................................................. 6
1.2 INA260EVM-PDK Features............................................................................................. 7
1.3 Related Documentation from Texas Instruments .................................................................... 8
2 INA260EVM-PDK Hardware.................................................................................................... 8
2.1 SM-USB-DIG Platform Description .................................................................................... 9
2.2 INA260EVM PCB Description......................................................................................... 10
2.3 EVM Digital Inputs and Outputs ...................................................................................... 12
3 INA260EVM-PDK Setup ....................................................................................................... 12
3.1 One-Time GUI Software Installation ................................................................................. 13
3.2 INA260EVM Jumper Settings......................................................................................... 15
3.3 Connecting the Hardware ............................................................................................. 16
3.4 System Power-Up ...................................................................................................... 18
4 INA260EVM GUI Software ................................................................................................... 19
4.1 Configuration Tool ..................................................................................................... 20
4.2 Results Bar .............................................................................................................. 23
4.3 Graph Tool............................................................................................................... 23
4.4 Registers Tool........................................................................................................... 24
5 INA260EVM Documentation................................................................................................. 24
5.1 Schematic................................................................................................................ 25
5.2 PCB Layout.............................................................................................................. 26
5.3 Bill of Materials.......................................................................................................... 27

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List of Figures
List of Figures
1 Hardware Included with the INA260EVM Kit............................................................................. 6
2 Placeholders for TVS Devices ............................................................................................. 7
3 INA260EVM-PDK Hardware Setup........................................................................................ 8
4 SM-USB-DIG Platform Block Diagram.................................................................................... 9
5 INA260EVM Block Diagram............................................................................................... 10
6 Recommended Display Settings ......................................................................................... 13
7 INA260EVM GUI Installation.............................................................................................. 14
8 INA260EVM Default Jumper Settings ................................................................................... 15
9 INA260EVM and SM-USB-DIG Connected in Proper Orientation................................................... 16
10 SM-USB-DIG Powers on When Connected to a Computer .......................................................... 17
11 INA260EVM Powers Up following the GUI Launch.................................................................... 18
12 VDUT Selection............................................................................................................... 19
13 Configuration Page......................................................................................................... 20
14 Slave Address Setting ..................................................................................................... 21
15 Operating Mode Menu..................................................................................................... 21
16 Configuring Conversion Times ........................................................................................... 22
17 Configuring the Alert Pin .................................................................................................. 22
18 INA260 Results Bar........................................................................................................ 23
19 Graph Tool Page ........................................................................................................... 23
20 Registers Tool Page ....................................................................................................... 24
21 INA260EVM Schematic.................................................................................................... 25
22 INA260EVM PCB Top Layer (Component Side)....................................................................... 26

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List of Tables
List of Tables
1 INA260EVM Kit Contents................................................................................................... 6
2 Related Documentation..................................................................................................... 8
3 Signal Definition of J4 on INA260EVM Board.......................................................................... 10
4 INA260 I2C Address Configuration....................................................................................... 12
5 INA260EVM Test Board Jumper Functions............................................................................. 16
6 Bill of Materials: INA260EVM ............................................................................................ 27

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Windows is a registered trademark of Microsoft, Corp.
I2C is a trademark of NXP Semiconductors.
All other trademarks are the property of their respective owners.
User's Guide
SBOU180–November 2016
INA260EVM-PDK and Software Tutorial
This user's guide describes the characteristics, operation, and use of the INA260EVM-PDK. This user's
guide discusses how to set up and configure the software and hardware, and reviews various aspects of
device operation. Throughout this document, the terms evaluation board,evaluation module,EVM PCB,
and EVM are synonymous with the INA260EVM PCB. The terms PDK,kit, and EVM kit are synonymous
with the INA260EVM-PDK. This user's guide also includes information regarding operating procedures
and input/output connections, an electrical schematic, printed circuit board (PCB) layout drawings, and a
parts list for the EVM.
1 Overview
The INA260 is a high- or low-side current sensor, power, and voltage monitor with a 2-mΩprecision
integrated shunt resistor and I2C™ interface. The INA260 offers programmable conversion times and
averaging modes, enabling high resolution measurements of the current, voltage, and power dissipation of
the source being monitored. The INA260EVM-PDK, which consists of the INA260EVM and SM-USB-DIG
controller board, is a platform for evaluating 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 be considered when using it.

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1.1 INA260EVM-PDK Contents
Table 1 summarizes the contents of the INA260EVM kit. Figure 1 shows all included hardware. Contact
the Texas Instruments Product Information Center nearest you if any component is missing.
NOTE: This EVM kit requires the INA260EVM GUI software, which is available for download through
the INA260 Tools & Software folder. Downloading the latest version of the GUI software is
recommended.
Table 1. INA260EVM Kit Contents
Item Quantity
INA260EVM PCB test board 1
SM-USB-DIG platform PCB 1
USB extender cable 1
Figure 1. Hardware Included with the INA260EVM Kit

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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 2) with a
minimum power rating of 1000 W to clamp the input voltages to less than 36 V.
Figure 2. Placeholders for TVS Devices

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
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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 the TI web site,
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 2. Related Documentation
Document Literature Number
INA260 product data sheet SBOS656
SM-USB-DIG platform user guide SBOU098
2 INA260EVM-PDK Hardware
Figure 3 shows the overall system setup for the INA260EVM-PDK. The power source to be monitored is
connected to the EVM input terminals. The computer runs the GUI software through which the user can
enable power to the INA260 and communicate with the device. User commands are sent through the
computer's USB port to the SM-USB-DIG board that translates these commands into I2C format, before
sending them 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.
Figure 3. INA260EVM-PDK Hardware Setup

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
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2.1 SM-USB-DIG Platform Description
Figure 4 shows the block diagram for the SM-USB-DIG platform. This platform is a general-purpose data
acquisition system that is used on several different Texas Instruments' evaluation modules. The details of
operation are included in a separate document, SBOU098 (available for download at www.ti.com).
The primary control device on the SM-USB-DIG platform is the TUSB3210. 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.
Figure 4. SM-USB-DIG Platform Block Diagram

T2
T1
J1 J4
J2, J3
INA260
VDUT Supply
GND
A0, A1
I2C interface
VBUS
IN+
IN-
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2.2 INA260EVM PCB Description
Figure 5 depicts a block diagram of the INA260EVM PCB highlighting the power supplies, analog inputs,
and digital I/O signals.
Figure 5. 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 3 lists the
pinout for J4.
(1) When VDUT is Hi-Z, all digital I/Os are Hi-Z as well.
Table 3. 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)
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 3, the available supply voltages for VDUT are 5V and
3.3V. The EVM supply voltage is user-selectable through the GUI. The 1µF ceramic capacitor, C2, placed
in close proximity to the INA260 (U1) supply pin provides 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. The GUI allows the INA260 to be configured for digitizing 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-mΩshunt resistor. Therefore, connect T1 and T2 in series with the input
current source and load; see Figure 3. 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, the following electrical ratings must
not be exceeded:
• 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 3, 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 slave
addresses summarized in Table 4. The values of A0 and A1 must be set using jumpers J2 and J3,
respectively.
Table 4. INA260 I2C Address Configuration
A1 A0 Slave 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
SCL and SDA are driven by the SM-USB-DIG via J4. 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.
3 INA260EVM-PDK 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.
Setting up the INA260EVM-PDK 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 6) must be set to Smaller - 100%.
Figure 6. Recommended Display Settings

1 2
3 4
56 7 8
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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 7 to complete the
software installation.
Figure 7. INA260EVM GUI Installation

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3.2 INA260EVM Jumper Settings
Figure 8 shows the default jumper configuration for the INA260EVM and Table 5 explain the purpose of
each jumper. Ensure that the jumpers are installed in the correct positions, based on the required test
conditions.
Figure 8. INA260EVM Default Jumper Settings

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Table 5. 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
To minimize risk of potential electrical shock hazard, be sure 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 9. Make
sure that the two connectors are completely pushed together; loose connections can cause intermittent
operation.
Figure 9. 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 10.
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 10. SM-USB-DIG Powers on When Connected to a Computer

To input
current
source low
side.
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3.4 System Power-Up
Launch the INA260EVM GUI software. By default the Power button on the GUI is enabled so the POWER
LED on the EVM immediately lights up, indicating that the EVM PCB is receiving power, as shown in
Figure 11.
Figure 11. 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 if necessary the 5-V option can be
selected, as shown in Figure 12.
Figure 12. VDUT Selection
With the INA260 powered on, the analog input sources can now be enabled.
Section 4 discusses the GUI configuration and data collection using this setup.
4 INA260EVM GUI Software
The INA260EVM GUI is a collection of software tools that make it easy for the user to explore the key
behaviors of the INA260. The following tools are available:
• The Configuration tool simplifies the INA260 setup prior to evaluation testing
• The Graph tool plots the acquired data and exports to a file if necessary
• The Registers tool displays and modifies the contents of the user-accessible registers
Each tool has a dedicated page that can be accessed by clicking on the corresponding tab on the GUI.
The tabs are organized intuitively from left to right in the proper order, and the GUI always displays the
Configuration page immediately after startup. Measurement data can be monitored using the Results Bar
at the bottom of the GUI window. In most cases (gross) testing can be performed using just the
Configuration tool and the Results Bar; the Graph and Registers tools may only be needed in special
situations.

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4.1 Configuration Tool
The Configuration tool allows the user to modify the operating conditions of the INA260 as required. User-
specified settings are translated to I2C frames and written to the appropriate device registers whenever the
user clicks the Write All Reg button. Equivalently, enabling the Auto-Write button causes immediate
register updates whenever changes are detected. The Configuration page of the GUI is shown in
Figure 13.
Figure 13. Configuration Page