User's Guide
SBOU188–August 2017
INA2180-2181 Evaluation Module User's Guide
This user’s guide describes the characteristics, operation, and use of the INA2180-2181 evaluation
module (EVM). This EVM is designed to evaluate the performance of the INA2180A1, INA2180A2,
INA2180A3, INA2180A4, INA2181A1, INA2181A2, INA2181A3, INA2181A4 voltage output current-shunt
monitors in a variety of configurations. This document includes a schematic, reference printed-circuit
board (PCB) layouts, and a complete bill of materials.
SBOU188–August 2017
Submit Documentation Feedback
INA2180-2181 Evaluation Module User's Guide
Copyright © 2017, Texas Instruments Incorporated
1
www.ti.com
Contents
1 Overview...................................................................................................................... 3
2 INA2180-2181EVM Hardware.............................................................................................. 3
3 Quick Start Setup and Use ................................................................................................. 4
4 INA2180-2181EVM Circuit.................................................................................................. 4
5 Reference Voltage Setup................................................................................................... 5
6 INA2180-2181EVM Schematic and PCB Layout ........................................................................ 6
7 Bill of Materials ............................................................................................................. 10
List of Figures
1 INA2180-2181EVM Schematic............................................................................................. 6
2 INA2180-2181EVM Top Overlay .......................................................................................... 7
3 INA2180-2181EVM Top Solder Mask..................................................................................... 7
4 INA2180-2181EVM Top Layer............................................................................................. 7
5 INA2180-2181EVM Bottom Layer ........................................................................................ 7
6 INA2180-2181EVM Drill Drawing.......................................................................................... 8
List of Tables
1 INA218x Device Summary ................................................................................................. 3
2 INA2180-2181EVM Kit Contents .......................................................................................... 3
3 Related Documentation ..................................................................................................... 3
4 Bill of Materials ............................................................................................................. 10
Trademarks
All trademarks are the property of their respective owners.
2
INA2180-2181 Evaluation Module User's Guide
Copyright © 2017, Texas Instruments Incorporated
Submit Documentation Feedback
SBOU188–August 2017
www.ti.com
1 Overview
The INA2180 family of current-shunt monitors (also called current-sense amplifiers) can sense drops
across shunts at common-mode voltages from –0.2 V to +26 V, independent of the supply voltage. Four
fixed gains are available: 20 V/V, 50 V/V, 100 V/V, and 200 V/V. The INA2181 family has the same
capabilities as the INA2180 family but with the addition of the reference pin that enables bidirectional
current measurements. These devices operate from a single 2.7-V to 5.5-V power supply, drawing a
maximum of 260 μA of supply current per amplifier channel.
The INA2180 devices are currently available in a VSSOP(8) and the INA2181 devices are available in a
TSSOP(14) surface-mount packages. Table 1 lists the available gain options.
Table 1. INA218x Device Summary
PRODUCT GAIN
INA2180A1, INA2181A1 20
INA2180A2, INA2181A2 50
INA2180A3, INA2181A3 100
INA2180A4, INA2181A4 200
1.1 INA2180-2181EVM Kit Contents
Table 2 lists the contents of the INA2180-2181EVM kit. Contact the nearest Texas Instruments Product
Information Center if any component is missing. TI highly recommends checking the INA2180 family
product folder on the TI website at www.ti.com for further information regarding this product.
Overview
Table 2. INA2180-2181EVM Kit Contents
ITEM QUANTITY
INA2180-2181EVM Test Board 1
1.2 Related Documentation From Texas Instruments
This user guide provides information regarding TI's integrated circuits used in the assembly of the
INA2180-2181EVM. See also the device data sheets:
Table 3. Related Documentation
DOCUMENT LITERATURE NUMBER
INA2180 Product data sheet SBOS741
INA2181 Product data sheet SBOS793
2 INA2180-2181EVM Hardware
The INA2180 is a current sense integration solution that provides ease of use and high performance. The
INA2181 has the same capabilities as the INA2180 but with the addition of the reference pin that enables
bidirectional current measurements. The INA2180-2181EVM provides basic functional evaluation of this
device family. 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 INA2180-2181EVM consists of one PCB with an option
to cut out eight individual PCBs - one for each of the eight devices (INA2180A1, INA2180A2, INA2180A3,
INA2180A4, INA2181A1, INA2181A2, INA2181A3 and INA2181A4).
SBOU188–August 2017
Submit Documentation Feedback
INA2180-2181 Evaluation Module User's Guide
Copyright © 2017, Texas Instruments Incorporated
3
INA2180-2181EVM Hardware
2.1 Features
The layout of the INA2180-2181EVM printed-circuit board (PCB) is designed to provide the following
features:
• Evaluation of all gain options for the INA2180Ax and INA2181Ax
• Ease of access to device pins with test points
• Capability to evaluate high-side and low-side configurations
See the INA2180 and INA2181 data sheets for comprehensive information about the INA2180 and
INA2181 family of devices.
3 Quick Start Setup and Use
The following are instructions to set up and use the INA2180Ax devices of the INA2180-2181EVM.
Step 1. Connect an external dc supply voltage between 2.7 V and 5.5 V to the VS test point, and
connect ground reference of that supply to the GND test point.
Step 2. Connect the input per Section 3.1.
The following are instructions to set up and use the INA2181Ax devices of the INA2180-2181EVM.
Step 1. Connect an external dc supply voltage between 2.7 V and 5.5 V to the VS test point, and
connect ground reference of that supply to the GND test point.
Step 2. Connect an external supply to the REF1 and REF2 test points. This reference voltage can be
set anywhere from 0 V to VS. Further details regarding the use of the reference voltage are
discussed later in Section 5.
Step 3. Connect the input per Section 3.1.
www.ti.com
3.1 Measurements
The INA2180-2181EVM enables the user to either simulate the voltage developed across a sense resistor
based on a given set of system conditions or to connect remotely to an existing shunt already included in
an example application.
The following procedures are used to configure a measurement evaluation without a shunt.
• Channel 1:
Step 1. Connect a differential voltage to the IN+1 and IN–1 test points.
Step 2. Measure the output voltage at the OUT1 test point.
• Channel 2:
Step 1. Connect a differential voltage to the IN+2 and IN–2 test points.
Step 2. Measure the output voltage at the OUT2 test point.
NOTE: The output voltage is equal to the gain of the device multiplied by the differential voltage
measured directly at the device input pins.
4 INA2180-2181EVM Circuit
This section summarizes the INA2180-2181EVM components. For the following instructions, x = 1 to 8.
4.1 Rx1, Rx2, Rx3, Rx4, Cx2, Cx3
Rx1 and Rx2 (Rx3 and Rx4 for Channel 2) are factory-installed 0-Ω resistors. These resistors, in
combination with Cx2 (Cx3 for Channel 2), form an input filter. These locations allow for 0805 surfacemount package size. Additional information regarding the use of input filtering is provided in the INA2180
and INA2181 product data sheets.
4
INA2180-2181 Evaluation Module User's Guide
Copyright © 2017, Texas Instruments Incorporated
Submit Documentation Feedback
SBOU188–August 2017
www.ti.com
4.2 Cx1
Cx1 are 0.1-μF supply bypass capacitors.
4.3 Ux
Ux is the location for the test device. Eight device boards are supplied with the INA2180-2181EVM board.
Each board is populated with one of the available device gains. This option enables users to test the
devices and determine the gain setting that is best suited for a given application.
The following is a list of the factors involved in selecting the appropriate device:
• The INA2180A1-A4 devices are identical with the exception of different gain settings. The INA2181A1-
• Select INA2180 for unidirectional applications only, and select INA2181 for unidirectional or
• The differential input voltage is applied across the inputs, or developed based on the load current that
• The limiting factor that requires attention to be given to device selection is the output voltage.
• The selected device must allow the output voltage to remain within the acceptable range after the
• An output below the minimum allowable output requires the selection of a device with a higher gain.
INA2180-2181EVM Circuit
A4 devices have the same device gain options of the INA2180 but with the addition of the reference
pin that enables bidirectional current measurements.
bidirectional applications.
flows through the shunt resistor.
developed input voltage is amplified by the respective device gain. The output voltage must remain
within the range of 10 mV above ground to 100 mV below the supply voltage.
Likewise, an output above the maximum allowable output requires the selection of a device with a
lower gain.
4.4 Voltages Inputs (IN+1, IN–1, IN+2, IN–2)
The IN+1 (IN+2 for Channel 2) and IN–1 (IN-2 for Channel 2) inputs accept a differential voltage that is
amplified by the selected device gain and is presented at the OUT1 (OUT2 for Channel 2) test point.
These inputs can also be used to connect the differential voltage developed across an external shunt in an
existing circuit. The acceptable differential input voltage range and polarity are determined by the supply
voltage, reference voltage, and gain of the selected device.
4.5 Reference Voltage (REF1, REF2)
REF1 and REF2 test points enables the user to configure the INA2181A1-A4 device boards for either
unidirectional or bidirectional operation. Refer to Section 5 for more information.
4.6 Rx5 and Rx6
Rx5 and Rx6 resistors locations are not populated. If a 0-Ω resistor is populated, the REF1 (REF2 for
Channel 2) pin will be connected to GND, and the INA2181 can be used for unidirectional measurements.
These locations allow for 0805 surface-mount package size.
5 Reference Voltage Setup
The INA2181A1-A4 devices enable the use of an external reference. This reference determines how the
output responds to certain input conditions. The reference also enables these devices to be used in
unidirectional and bidirectional applications. The REF pin can also be connected to supply (VS) to enable
unidirectional measurement in the negative direction.
5.1 Unidirectional Mode
Unidirectional refers to a load current that flows in only one direction.
The INA2180A1-A4 devices are able to measure unidirectional currents only. The INA2181A1-A4 devices
measure unidirectional and bidirectional currents. For unidirectional measurements the REF pins (REF1
and REF2) needs to be connected to GND. You can connect the REF1 pin (REF2 for Channel 2) to GND
through a 0-ohm resistor (Rx5 and Rx6) or ground it directly.
SBOU188–August 2017
Submit Documentation Feedback
INA2180-2181 Evaluation Module User's Guide
Copyright © 2017, Texas Instruments Incorporated
5
Reference Voltage Setup
5.2 Bidirectional Mode
Bidirectional refers to a load current that flows in both directions.
The INA2181A1-A4 devices are able to measure bidirectional currents. The ability to measure this current
flowing in both directions is enabled by applying a voltage to the REF pin (REF1 and REF2). The voltage
applied to REF1 (REF2 for Channel 2) sets the output state that corresponds to the zero-input level state.
The output then responds by increasing above REF1 for positive differential signals (relative to the IN–1
pin) and responds by decreasing below REF1 for negative differential signals. This reference voltage
applied to the REF1 pin can be set anywhere from 0 V to VS. For bidirectional applications, REF1 is
typically set at mid-scale for equal signal range in both current directions. In some cases, however, REF1
is set at a voltage other than mid-scale when it is unnecessary that the bidirectional current and
corresponding output signal be symmetrical.
6 INA2180-2181EVM Schematic and PCB Layout
NOTE: Board layouts are not to scale. These figures are intended to show how the board is laid out.
The figures are not intended to be used for manufacturing INA2180-2181EVM PCBs.
6.1 Schematic
Figure 1 shows the schematic for the INA2180-2181EVM PCB.
www.ti.com
Figure 1. INA2180-2181EVM Schematic
6
INA2180-2181 Evaluation Module User's Guide
Copyright © 2017, Texas Instruments Incorporated
Submit Documentation Feedback
SBOU188–August 2017
Loading...