Texas Instruments INA301EVM User manual

User's Guide
SBOU154–November 2015
INA301EVM User's Guide
This user’s guide describes the characteristics, operation, and use of the INA301EVM evaluation module.
This guide discusses how to set up and configure the hardware. Throughout this document, the terms
evaluation board,evaluation module, and EVM are synonymous with the INA301EVM. This document also
includes an electrical schematic, printed circuit board (PCB) layout drawings, and a parts list for the EVM.
Contents
1 Overview ..................................................................................................................... 2
2 INA301EVM Hardware...................................................................................................... 3
3 Schematic, PCB Layout, and Bill of Materials ........................................................................... 5
List of Figures
1 INA301EVM Test Board Block Diagram.................................................................................. 3
2 INA301EVM Test Board Schematic....................................................................................... 5
3 INA301EVM Component Placement ...................................................................................... 6
4 PCB Top Layer............................................................................................................... 7
5 PCB Bottom Layer........................................................................................................... 8
List of Tables
1 INA301EVM Kit Contents................................................................................................... 2
2 Related Documentation..................................................................................................... 2
3 INA301 Test Board BOM .................................................................................................. 9
All trademarks are the property of their respective owners.
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Overview www.ti.com
1 Overview
The INA301 is a high- or low-side, current-shunt monitor with an analog output and an open-drain
comparator. The integrated comparator features an adjustable threshold that is set using an external limit-
setting resistor. The INA301EVM has four PCBs and a PDIP receptacle for accepting the INA301 device
attached to coupon boards. All three gain versions are supplied within this EVM package. The EVM also
consists of screw-terminals and test points for external hardware connections, placeholder pads to add
components for filtering, surface-mount resistors for ease of adjusting the comparator threshold, a jumper
to change comparator mode by connecting RESET pin to either VS or GND, and a jumper for enabling or
disabling the LED light that is connected to the ALERT pin.
1.1 INA301EVM Kit Contents
Table 1 summarizes the contents of the INA301EVM kit. The included hardware is pictured on the front
page. Contact the nearest Texas Instruments Product Information Center if any component is missing.
Make sure to check the INA301 product folder on the TI web site at www.ti.com for any further information
regarding this product.
Table 1. INA301EVM Kit Contents
Item Quantity
INA301EVM test board 1
INA301A1 coupon board 1
INA301A2 coupon board 1
INA301A3 coupon board 1
1.2 Related Documentation from Texas Instruments
The following documents provide information regarding Texas Instruments' integrated circuits used in the
assembly of the INA301EVM. This user's guide is available from the TI web site under literature number
SBOU154. 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
(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 2. Related Documentation
Document Literature Number
INA301 product data sheet SBOS713
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VS
OUT
INA301A1/2/3
LIMIT
GND
IN+
IN±
ALERT
RESET
VS
VS VS
www.ti.com INA301EVM Hardware
2 INA301EVM Hardware
The INA301EVM requires a 2.7-V to 5.5-V power supply. Connect the VIN+ and VIN– pins across an
external shunt resistor in series with a 0-V to 36-V supply to determine the current flowing through that
resistor. Use a voltmeter on the OUT pin to measure the voltage output and on the ALERT pin to
determine the comparator output. The comparator threshold is set with a resistor. The open-drain
comparator output is pulled up to VS and there is also a red LED light that serves as a visual indicator of a
tripped comparator.
2.1 Theory of Operation for the INA301EVM
A block diagram of the INA301EVM test board hardware is shown in Figure 1. The INA301 test board
contains eight test points, providing access to all eight pins of the INA301 for evaluation. Two terminal
blocks also provide additional convenient connection to the DUT pins. Support circuitry is included on the
PCB but can be removed or bypassed if needed.
Figure 1. INA301EVM Test Board Block Diagram
2.2 INA301EVM Features
The INA301EVM provides basic functional evaluation of the INA301. The fixture layout is not intended to
be a model for the target circuit, nor is it laid out for electromagnetic compatibility (EMC) testing.
The layout of the INA301EVM printed circuit board (PCB) is designed to provide the following features:
• Ease of access to all device pins
• Multiple input signal options
• Space for optional input filtering capacitors and resistors
• A threshold limit resistor for setting comparator input threshold
• A jumper reset for the comparator
• Visual LED indicator of the comparator output with the option to be enabled/disabled through a jumper.
The INA301EVM allows connection to both sides of a remote shunt resistor to measure current, or omit
the shunt resistor and apply a differential voltage directly to the device inputs. This flexibility allows the
testing of device operation in a simulated manner, as well as an actual application.
See the product data sheet for comprehensive information about the INA301 family of devices.
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INA301EVM Hardware www.ti.com
2.3 Quick-Start Setup and Use
Follow these procedures to set up and use the INA301EVM:
1. Connect an external dc supply voltage between 2.7 V and 5.5 V to the J3-1 terminal.
2. Connect the desired input to the J4 terminal. This input is either a remote shunt resistor or a differential
voltage source with a common-mode voltage of 0 V to 36 V referenced to GND.
2.4 Voltage Inputs
The J4 terminal (VIN+ and VIN–) is used to connect to a remote shunt resistor or a differential voltage
source. The voltage differential is multiplied by the 20-V/V device gain of the INA301A1. Other devices in
this family are the INA301A2 with 50-V/V gain and the INA301A3 with 100-V/V gain. The full-scale sense
input voltage (VSENSE) is defined as VIN+ – VIN–, and has a maximum input of (V+ – 0.20) / gain in order
to achieve linear output. The minimum voltage output is 10 mV.
2.5 Comparator Trip Point
The integrated comparator in the INA301 has a resistor programmable threshold. Connecting an
appropriately sized resistor on the LIMIT pin sets up the comparator threshold. Adjust R3 (see Figure 2) to
set the comparator trip point for the intended application. The EVM comes with R3 = 31.6 kΩ, which
produces a comparator threshold of 80 µA × 31.6 kΩ= 2.528 V.
For example, if measuring current across a 10-mΩshunt resistor (and the comparator must be tripped if
an excess of 10 A is measured), then 10 A × 10 mΩ= 100 mV, and 100 mV × 20 V/V gain = 2 V. To
achieve a comparator threshold of 2 V, select R3 so that R3 x 80 µA = 2 V. A simple calculation indicates
R3 = 25 kΩ.
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www.ti.com Schematic, PCB Layout, and Bill of Materials
3 Schematic, PCB Layout, and Bill of Materials
3.1 Schematic
Figure 2 shows the complete schematic of the INA301 test board. R3 sets up the voltage threshold of the
comparator. R1 is a pullup resistor for the open-drain comparator output pin. D1 is connected to the
comparator output pin, and is a visual indicator of an alert condition. D1 can be disabled by disconnecting
jumper J2. Use jumper J1 to configure the comparator mode. Install J1 at position 3-2 for transparent
mode comparison output and at position 2-1 for latched mode comparison output. C1 is a bypass
capacitor for VS. C2 along with R4 and R5 creates an optional filter for the VIN+ and VIN– inputs. R6 is
an optional shunt resistor for the INA input.
Figure 2. INA301EVM Test Board Schematic
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Schematic, PCB Layout, and Bill of Materials www.ti.com
3.2 PCB Layout
Figure 3 shows the component placement on the INA301EVM test board. There are no components on
the bottom layer. Figure 4 and Figure 5 illustrate the top and bottom layers, respectively, of the test board.
Figure 3. INA301EVM Component Placement
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www.ti.com Schematic, PCB Layout, and Bill of Materials
Figure 4. PCB Top Layer
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Schematic, PCB Layout, and Bill of Materials www.ti.com
Figure 5. PCB Bottom Layer
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www.ti.com Schematic, PCB Layout, and Bill of Materials
3.3 Bill of Materials
Table 3 lists the bill of materials (BOM) for the INA301 test board.
Table 3. INA301 Test Board BOM
Qty RefDes Description Part Number MFR
8 RST, LIM, OUT, GND, Test Point, Compact, SMT 5016 Keystone
V+, VIN+, VIN–, ALERT
1 C1 CAP, CERM, 0.1 µF, 16 V, +/- 5%, X7R, 0603 0603YC104JAT2A AVX Corp.
1 D1 Diode, LED, Red, 2.1-V, 20-mA, 6-mcd LTST-C190CKT Lite On
4 H9-H12 Bumpon, Hemisphere, 0.44 X 0.20, Clear SJ-5303 (CLEAR) 3M
1 J1 Header, 100mil, 3x1, Gold, TH TSW-103-07-G-S Samtec
1 J2 Header, 100mil, 2x1, Gold, TH TSW-102-07-G-S Samtec
1 J3 On-Shore
Terminal Block, 6A, 3.5mm Pitch, 3-Pos, TH ED555/3DS Technology
1 J4 On-Shore
Terminal Block, 6A, 3.5mm Pitch, 2-Pos, TH ED555/2DS Technology
6 J5-J10 Header, 100mil, 4x1, Gold, TH 342-10-104-00-591000 Mill-Max
8 J11-J18 Socket, 1x1, Height 4.27mm, TH 50935 TE Connectivity
1 R1 RES, 10 k, 5%, 0.1 W, 0603 CRCW060310K0JNEA Vishay-Dale
1 R2 RES, 470, 5%, 0.1 W, 0603 CRCW0603470RJNEA Vishay-Dale
1 R3 RES, 31.6 k, 1%, 0.125 W, 0805 CRCW080531K6FKEA Vishay-Dale
2 R4, R5 RES, 0, 5%, 0.125 W, 0805 ERJ-6GEY0R00V ERJ-6GEY0R00V
1 U2 High- or Low-Side Current-Sense Amplifier with High-Speed INA301A1IDGKR Texas Instruments
Comparator, DGK0008A
1 U3 High- or Low-Side Current-Sense Amplifier with High-Speed INA301A2IDGKR Texas Instruments
Comparator, DGK0008A
1 U4 High- or Low-Side Current-Sense Amplifier with High-Speed INA301A3IDGKR Texas Instruments
Comparator, DGK0008A
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STANDARD TERMS AND CONDITIONS FOR EVALUATION MODULES
1. Delivery: TI delivers TI evaluation boards, kits, or modules, including any accompanying demonstration software, components, or
documentation (collectively, an “EVM” or “EVMs”) to the User (“User”) in accordance with the terms and conditions set forth herein.
Acceptance of the EVM is expressly subject to the following terms and conditions.
1.1 EVMs are intended solely for product or software developers for use in a research and development setting to facilitate feasibility
evaluation, experimentation, or scientific analysis of TI semiconductors products. EVMs have no direct function and are not
finished products. EVMs shall not be directly or indirectly assembled as a part or subassembly in any finished product. For
clarification, any software or software tools provided with the EVM (“Software”) shall not be subject to the terms and conditions
set forth herein but rather shall be subject to the applicable terms and conditions that accompany such Software
1.2 EVMs are not intended for consumer or household use. EVMs may not be sold, sublicensed, leased, rented, loaned, assigned,
or otherwise distributed for commercial purposes by Users, in whole or in part, or used in any finished product or production
system.
2Limited Warranty and Related Remedies/Disclaimers:
2.1 These terms and conditions do not apply to Software. The warranty, if any, for Software is covered in the applicable Software
License Agreement.
2.2 TI warrants that the TI EVM will conform to TI's published specifications for ninety (90) days after the date TI delivers such EVM
to User. Notwithstanding the foregoing, TI shall not be liable for any defects that are caused by neglect, misuse or mistreatment
by an entity other than TI, including improper installation or testing, or for any EVMs that have been altered or modified in any
way by an entity other than TI. Moreover, TI shall not be liable for any defects that result from User's design, specifications or
instructions for such EVMs. Testing and other quality control techniques are used to the extent TI deems necessary or as
mandated by government requirements. TI does not test all parameters of each EVM.
2.3 If any EVM fails to conform to the warranty set forth above, TI's sole liability shall be at its option to repair or replace such EVM,
or credit User's account for such EVM. TI's liability under this warranty shall be limited to EVMs that are returned during the
warranty period to the address designated by TI and that are determined by TI not to conform to such warranty. If TI elects to
repair or replace such EVM, TI shall have a reasonable time to repair such EVM or provide replacements. Repaired EVMs shall
be warranted for the remainder of the original warranty period. Replaced EVMs shall be warranted for a new full ninety (90) day
warranty period.
3Regulatory Notices:
3.1 United States
3.1.1 Notice applicable to EVMs not FCC-Approved:
This kit is designed to allow product developers to evaluate electronic components, circuitry, or software associated with the kit
to determine whether to incorporate such items in a finished product and software developers to write software applications for
use with the end product. This kit is not a finished product and when assembled may not be resold or otherwise marketed unless
all required FCC equipment authorizations are first obtained. Operation is subject to the condition that this product not cause
harmful interference to licensed radio stations and that this product accept harmful interference. Unless the assembled kit is
designed to operate under part 15, part 18 or part 95 of this chapter, the operator of the kit must operate under the authority of
an FCC license holder or must secure an experimental authorization under part 5 of this chapter.
3.1.2 For EVMs annotated as FCC – FEDERAL COMMUNICATIONS COMMISSION Part 15 Compliant:
CAUTION
This device complies with part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) This device may not
cause harmful interference, and (2) this device must accept any interference received, including interference that may cause
undesired operation.
Changes or modifications not expressly approved by the party responsible for compliance could void the user's authority to
operate the equipment.
FCC Interference Statement for Class A EVM devices
NOTE: This equipment has been tested and found to comply with the limits for a Class A digital device, pursuant to part 15 of
the FCC Rules. These limits are designed to provide reasonable protection against harmful interference when the equipment is
operated in a commercial environment. This equipment generates, uses, and can radiate radio frequency energy and, if not
installed and used in accordance with the instruction manual, may cause harmful interference to radio communications.
Operation of this equipment in a residential area is likely to cause harmful interference in which case the user will be required to
correct the interference at his own expense.
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