Texas Instruments INA190EVM Manuale utente

SBOU201A–April 2018–Revised September 2018

INA190EVM User's Guide

User's Guide

SBOU201A–April 2018–Revised September 2018

INA190EVM User's Guide

This user’s guide describes the characteristics, operation, and use of the INA190 evaluation module

(EVM). This EVM is designed to evaluate the performance of the INA190 voltage-output, current shunt

monitor in a variety of configurations. This document also includes a schematic, reference printed-circuit

board (PCB) layouts, and a complete bill of materials (BOM).

Contents

1 Overview...................................................................................................................... 2

2 INA190EVM Hardware ..................................................................................................... 3

3 Quick Start Setup and Use ................................................................................................. 4

4 INA190EVM Circuit and Components .................................................................................... 5

5 Reference Voltage Setup................................................................................................... 6

6 Guarding Voltage - Using the "Guarded Inputs" Panel ................................................................ 7

7 INA190EVM Schematic and PCB Layout ................................................................................ 8

8 Bill of Materials ............................................................................................................. 13

Overview

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INA190EVM User's Guide

List of Figures

1 INA190EVM Schematic - Gain A1 and A3 Panels ...................................................................... 8

2 INA190EVM Schematic - Gain A2 and A4 Panels ...................................................................... 9

3 INA190EVM Schematic - Gain A5 and Guarding Panels............................................................. 10

4 INA190EVM Top Overlay ................................................................................................. 11

5 INA190EVM Bottom Overlay ............................................................................................. 11

6 INA190EVM Top Layer.................................................................................................... 11

7 INA190EVM Bottom Layer ............................................................................................... 11

8 INA190EVM Top Solder .................................................................................................. 11

9 INA190EVM Bottom Solder .............................................................................................. 11

10 INA190EVM Drill Drawing................................................................................................. 12

List of Tables

1 INA190 Device Summary................................................................................................... 2

2 INA190EVM Kit Contents................................................................................................... 3

3 Related Documentation..................................................................................................... 3

4 Bill of Materials ............................................................................................................. 13

Trademarks

All trademarks are the property of their respective owners.

1 Overview

The INA190 devices are voltage output, high- and low-side measurement, bi-directional, zero-drift current

shunt monitors. This family of devices has gains that range from 25 V/V to 500 V/V. The voltage

developed across the device inputs is amplified by the corresponding gain of the specific device and is

presented at the output pin. These devices can accurately sense voltage drops across shunts at common-

mode voltages from –0.1 V to 40 V, independent of supply voltages. These devices operate with supply

voltages between 2.7 V and 5.5 V and draw a maximum of 65 µA at room temperature. The low offset of

the zero-drift architecture enables the sensing of very small differential input voltage which helps widen

the usable input dynamic range. Additionally, the INA190 has a very low input bias current and thus, can

easily measure microamps of current.

The INA190 devices are currently available in a QFN package. Table 1 summarizes the available device

gain options.

Table 1. INA190 Device Summary

Product Gain

INA190A1 25

INA190A2 50

INA190A3 100

INA190A4 200

INA190A5 500

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Overview

SBOU201A–April 2018–Revised September 2018

INA190EVM User's Guide

1.1 INA190 Kit Contents

Table 2 summarizes the contents of the INA190EVM kit. Contact the Texas Instruments Product

Information Center nearest you if any component is missing. TI also recommends checking the INA190

device product folder at www.ti.com for any further information regarding this product.

Table 2. INA190EVM Kit Contents

Item Item Part Number Quantity

INA190EVM test board SENS010 1

Quick Connect Receptacle 10-12AWG, 0.250" 4-520448-2 2

Shunt Connector 2POS 2-881545-2 12

1.2 Related Documentation From Texas Instruments

This document provides information regarding Texas Instruments' integrated circuits used in the assembly

of the INA190EVM.

Table 3. Related Documentation

Document Literature Number

INA190 product data sheet SBOS863

2 INA190EVM Hardware

The INA190EVM is intended to provide basic functional evaluation of the INA190 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 INA190EVM consists of one PCB with an option to cut out six individual PCBs, one for

each of the five gain variants (INA190A1, INA190A2, INA190A3, INA190A4, and INA190A5). Each of the

PCB cutouts consists of one INA190AXIRSW device (where x is 1, 2, 3, 4, and 5) and test points for

external hardware connections, as well as pads to solder down optional circuitry. A sixth board includes a

guarding scheme to guard the input traces thus, preventing leakage current. This board has the INA190A5

as the installed test device.

2.1 Features

The INA190EVM PCB provides the following features:

• Evaluation of all gain options through provided device boards

• Ease of access to device pins with test points

• Pads for optional filtering at the input pins, output pin, and reference pin

• Pads for optional reference buffer driving circuit with SOT-23-5 op amp

• Multiple input signal options including a method to solder the shunt resistor and safely measure current

up to 15 A

• Low-current measurement panel with a voltage guarding plane to minimize leakage currents

Refer to INA190 Low Supply, Voltage Output, Low- or High-Side Measurement, Bidirectional, Zero-Drift

Series, Current-Shunt Monitors for comprehensive information about the INA190 family of devices.

Quick Start Setup and Use

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INA190EVM User's Guide

3 Quick Start Setup and Use

Follow these procedures to set up and use one of the panels of the INA190EVM. For the following

instructions, x = 1, 2, 3, 4, 5, or [blank].

Step 1. Choose the desired gain option panel.

Step 2. Ensure the J3x and J4x headers for the enable (EN) and reference (VREF) pins are set to

the appropriate voltages. For the device to amplify the input signal, it must be enabled by

connecting the VS and ENABLE pins of J4x. For the device to have a ground reference, the

REF and GND pins for J3x must be connected. If a custom reference voltage is desired,

remove the jumper from J3x and drive the REF pin with an external voltage source.

Step 3. Connect an external DC supply voltage between 1.7 V and 5.5 V to a VS test point (TP1x or

TP3x), and connect the ground reference of that supply to a GND test point (TP2x,TP4x,

TP8x) on same panel.

Step 4. Provide an input voltage signal (referenced to GND) to the IN+ and IN– pins by connecting

signal leads to J0x and J1x quick-fit tabs. This is explained in Section 3.1.

3.1 Measurements

The INA190EVM allows the user to either simulate the voltage developed across a sense resistor based

on a given set of system conditions, or to connect it remotely to an existing shunt already included in an

example application. Additionally, a surface-mount technology (SMT) shunt resistor can be soldered

across the IN+ and IN– pads these inputs can be connected in-series with their system and load.

To configure a measurement evaluation without a shunt resistor, follow these procedures:

1. Connect a differential voltage to the IN+ (J0x) and IN– (J1x) tabs. With the reference voltage set at

ground, ensure that the IN+ pin is the more positive of the two inputs.

2. Additionally, if the differential voltage supply is a floating supply, connect a –0.1-V to 40-V common-

mode voltage to the inputs by connecting the positive lead of the external voltage source to the IN–

(J1x) tab and source ground to a GND testpoint. This effectively raises the absolute voltage of the

input pins, while still retaining a positive input differential signal.

3. Measure the output voltage at the OUT test point (TP5x).

To configure a measurement evaluation with a shunt resistor, follow these procedures:

1. Solder down a resistor at the R8x pad that connects the IN+ (J0x) and IN– (J1x) inputs.

2. Connect the IN+ (J0x) and IN– (J1x) tabs in series with the load and bus voltage sources while

powered off.

WARNING

If measuring current, please first ensure the equipment (shunt

resistor, wires, connectors, and so forth) being used can support

the amperage and power dissipation. Secondly, ensure the current

flowing through J0x and J1x does not exceed 15 A. If using the

"Guarded Inputs" panel, ensure current flowing between J0 and J1

does not exceed 10 A. Failure to do any of this could result in hot

surfaces (> 55°C), damage to the EVM, or personal injury.

3. Power on the system and measure the output voltage at the OUT test point (TP5x).

NOTE: The output voltage (if measured with respect to reference voltage) is equal to the gain of the

device multiplied by the differential voltage measured directly at the device input pins.

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INA190EVM Circuit and Components

SBOU201A–April 2018–Revised September 2018

INA190EVM User's Guide

4 INA190EVM Circuit and Components

This section summarizes the INA190EVM components. For the following instructions, x = 1 to 5 or a

[blank].

4.1 R5x, R6x, R7x, R3x,C2x, C3x, C4x, C9x

R5x, R6x, R7x, and R3x are factory-installed 0-Ωresistors. C2x, C3x, C4x, and C9x are not populated

except for C9x. Collectively, these pads allow for user-defined filters for the input, reference signal, and

output. If a filter is desired, remove these resistors and replace them with > 0-ΩSMT resistors and

populate the capacitor pads with capacitors. Additional information regarding the use of input filtering is

provided in INA190 Low Supply, Voltage Output, Low- or High-Side Measurement, Bidirectional, Zero-Drift

Series, Current-Shunt Monitors.

4.2 C1x, C5x

C1x and C5x are 0.1-µF power supply bypass capacitors.

4.3 R1x, R2x

R1x and R2x are resistors used to divide down VS supply voltage and drive a custom, on-board reference

voltage into U2x if R2x and U2x are populated.

4.4 R4

R4 is a connection resistor for the "Guarded Inputs" panel. Populate this with a 0-Ωresistor to connect the

guarding plane to automatically be driven to the same voltage as the input common-mode voltage. This

may only be necessary if measuring very small currents at high common-mode voltages.

4.5 R8x

R8x is unpopulated, but allows a surface-mount shunt resistor to be soldered down in between the IN+

and IN– inputs. If used, ensure R8x has proper power dissipation for the user-set current load. This

resistor chosen must at a minimum have a 0603 Imperial footprint.

4.6 U1x - INA190

U1x is the location for the INA190x test device. Six device boards are supplied with the INA190EVM

board. Each board is populated with one of the available device gains. This option allows users to test the

devices and determine the gain setting that is best suited for a given application.

The following list of factors are involved in selecting the appropriate device:

• The INA190 devices are identical with the exception of different gain settings.

• The differential input voltage is either applied across the inputs or developed based on the load current

that flows through the shunt resistor.

• The limiting factor that requires attention to be given to device selection is the output voltage not

exceeding the supply voltage or going below GND.

• The selected device must allow the output voltage to remain within the acceptable range after the

developed input voltage is amplified by the respective device gain. The output voltage must remain

with the swing limitations specified for the device for response in the linear range.

• An output below the minimum allowable output requires the selection of a device with a higher gain.

Likewise, an output above the maximum allowable output requires the selection of a device with a

lower gain.

4.7 U2x

U2x is not populated, but allows a SOT-23-5 operational amplifier to be soldered to the EVM. In

conjunction with populating R1x and R2x with the desired ratio of resistances, U2x provides a low-

impedance voltage source for the REF pin of the INA190. Two options to populate this pad are

TLV6001IDBVR and TLV379IDBV.

INA190EVM Circuit and Components

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4.8 J0x, J1x

J0x and J1x are 0.240 inch non-insulated, quick-fit terminals that are designed to insert into similarly-sized

female receptacles. The kit provides two receptacles. Using insulated receptacles with J0x and J1x

terminals allows the user to ensure a strong and safe connection between the current source and EVM

when dealing with high currents.

WARNING

If using the EVM to measure currents, ensure a proper power

resistor is soldered at the R8x pad and the receptacles (connecting

to J0x and J1x) and their crimped wires can support the amperage

of the current being measured and the necessary power

dissipation. Do not exceed 15 A of current flowing between J0x

and J1x. If using the "Guarded Inputs" panel, ensure current

flowing from J0 to J1 does not exceed 10 A. Failure to do any of

this could result in hot surfaces (> 55°C), damage to the EVM, or

personal injury.

Standard metal clips can electrically interface with these tabs for lower currents.

The IN+ (J0x) and IN– (J1x) inputs accept a differential voltage that is amplified by the selected device

gain and is presented at the OUT test point (TP5x). These inputs could 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.

5 Reference Voltage Setup

The INA190 devices allow for the use of an external reference through the REF pin. The INA190EVM

provides a test point to drive the REF pin externally or pads to solder a buffer amplifier to drive a custom

voltage generated from the resistor divider off the VS power plane. The reference determines what offset

the output will have and allows these devices to be used in both unidirectional and bi-directional current

sensing applications.

5.1 Unidirectional Mode

Unidirectional refers to a load current that flows in only one direction. For unidirectional applications, the

reference voltage can be set to ground or to 5 V. If the reference is set to ground, the output is set at near

ground with no input voltage, and responds to input voltages that are positive with respect to IN– / Load. If

the reference is set to 5 V, the output is set near 5 V with no input voltage, and responds to input voltages

that are negative with respect to IN– / Load.

5.2 Bi-Directional Mode

Bi-directional refers to a load current that flows in both directions. For bi-directional applications, the

reference voltage should be set anywhere within the GND to VS range. The voltage applied to the

reference pin establishes the output voltage of the device with no input voltage. The output voltage is

limited by the supply voltage minus the specified output swing to VS in the data sheet.

5.3 REF Pin Configuration

The REF test point (TP6x) allows configuration of the INA190EVM for either unidirectional or bi-directional

operation. The INA190EVM has an onboard circuit that allows the supply of a custom reference voltage

that is powered through the supply voltage.

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Guarding Voltage - Using the "Guarded Inputs" Panel

SBOU201A–April 2018–Revised September 2018

INA190EVM User's Guide

5.3.1 U2x Buffer Not Populated

Jump pins 2 (REF) and 3 (GND) of the J3x header to make REF = GND. The jumper can be removed

from the EVM and the REF test points (TP6x or pin 2 of J3x) can be driven with the external voltage

source. Note this external source needs a common ground with the INA190 power source.

5.3.2 U2x Buffer Populated

Be sure to populate R2x. If R2x equals R1x, then the U2x buffer output will equal VS/2. Jump pins 2

(REF) and 1 (VS/2) of the J3x header to drive the REF pin with the output of U2x.

6 Guarding Voltage - Using the "Guarded Inputs" Panel

One panel on the INA190EVM is labeled as "Guarded Inputs" because it includes extra circuitry to help

guard the input traces going into the IN+ and IN– pins of the INA190. When measuring a small current, it

is desirable to minimize the input bias currents of the device, which is in the nanoamps. The input bias

current could increase due to leakage currents sinking into a nearby ground plane and this is simply due

to finite resistance of PCB material and a voltage potential. This voltage potential only grows as common-

mode voltage increases. Guard the input traces with an isolated guarding plane and fence that is at the

same potential and any leakage currents from the input traces will be significantly reduced. This technique

is really more practical when dealing with currents in the picoamps level, but it is included to help evaluate

any extreme cases: low-current or high common-mode voltage or both.

The guarding plane can be driven by an external voltage source using the VG tespoint (TP7) or by

populating R4 with a 0-Ωresistor, which will automatically tie common-mode voltage at the inputs to the

guarding plane. If using the VG tespoint, ensure the external source has a common ground with the

INA190.

TP11

TP21

TP31

VS1

GND1

VS1

GND1

10.0k

R11

REF1

0.1 µF

C21

0.1 µF

C91

0.1 µF

C31

REF1

GND1

R51

R61

0.1 µF

C41

R71

GND1

10.0k

R21

0.1 µF

C51

GND1

NC 1

NC 2

IN+

IN-

NC 5

ENABLE

REF

8GND 9

OUT 10

U11

INA190A1RSW

GND1

0.1 µF

C11

GND1

0.002

R81

J41

M20-8770342

GND1

VS1

TP13

TP23

TP33

VS3

GND3

VS3

GND3

10.0k

R13 REF3

0.1 µF

C23

0.1 µF

C93

0.1 µF

C33

REF3

GND3

R53

R63

0.1 µF

C43

R73

GND3

10.0k

R23

0.1 µF

C53

GND3

NC 1

NC 2

IN+

IN-

NC 5

ENABLE

REF

8GND 9

OUT 10

U13

INA190A3RSW

GND3

0.1 µF

C13

GND3

0.002

R83

J43

M20-8770342

GND3

VS3

J03

IN+

J13

IN-

J01

IN+

J11

IN-

GND1

J31

J33

GND3

V+

V-

U23

TLV6001IDBVR

V+

V-

U21

TLV6001IDBVR

R330

R31

TP43

TP41

TP51

TP53

TP63TP61

TP81

TP83

INA190EVM Schematic and PCB Layout

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INA190EVM User's Guide

7 INA190EVM Schematic and PCB Layout

NOTE: Board layouts are not to scale. These figures are intended to show how the board is laid out; they are not intended to be used for

manufacturing INA190EVM PCBs.

7.1 Schematic

Figure 1 through Figure 3 show the schematics for the INA190EVM PCB.

Figure 1. INA190EVM Schematic - Gain A1 and A3 Panels

TP12

TP22

TP32 VS2

VS2

GND2

VS2

GND2

10.0k

R12

0.1 µF

C22

0.1 µF

C92

0.1 µF

C32

GND2

R52

R62

0.1 µF

C42

R72

GND2

10.0k

R22

0.1 µF

C52

GND2

NC 1

NC 2

IN+

IN-

NC 5

ENABLE

REF

8GND 9

OUT 10

U12

INA190A2RSW

GND2

0.1 µF

C12

GND2

0.002

R82

J42

M20-8770342

GND2

VS2

TP14

TP24

TP34

VS4

GND4

VS4

GND4

10.0k

R14

REF4

0.1 µF

C24

0.1 µF

C94

0.1 µF

C34

REF4

GND4

R54

R64

0.1 µF

C44

R74

GND4

10.0k

R24

0.1 µF

C54

GND4

NC 1

NC 2

IN+

IN-

NC 5

ENABLE

REF

8GND 9

OUT 10

U14

INA190A4RSW

GND4

0.1 µF

C14

GND4

V+

V-

U24

TLV6001IDBVR

0.002

R84

J44

M20-8770342

GND4

VS4

J02

IN+

J12

IN-

J04

IN+

J14

IN-

J32

GND2

REF2

J34

GND4

V+

V-

U22

TLV6001IDBVR

R32

R34

TP44

TP42

TP54

TP52

TP64TP62

TP82

TP84

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INA190EVM Schematic and PCB Layout

SBOU201A–April 2018–Revised September 2018

INA190EVM User's Guide

Figure 2. INA190EVM Schematic - Gain A2 and A4 Panels

TP1

TP2

TP3

VS GND

GND

10.0k

REF

0.1 µF

REF

GND

0.1 µF

GND

10.0k

0.1 µF

GND

NC 1

NC 2

IN+

IN-

NC 5

ENABLE

REF

8GND 9

OUT 10

INA190A5RSW

GND

0.1 µF

GND

1.00k

M20-8770342

GND

TP7

TP15

TP25

TP35 VS5

VS5

GND5

VS5

GND5

10.0k

R15 REF5

0.1 µF

C25

0.1 µF

C95

0.1 µF

C35

REF5

GND5

R55

R65

0.1 µF

C45

R75

GND5

10.0k

R25

0.1 µF

C55

GND5

NC 1

NC 2

IN+

IN-

NC 5

ENABLE

REF

8GND 9

OUT 10

U15

INA190A5RSW

GND5

0.1 µF

C15

GND5

V+

V-

U25

TLV6001IDBVR

0.002

R85

J45

M20-8770342

GND5

VS5

IN+

IN-

J05

IN+

J15

IN-

J3 GND

J35

GND5

V+

V-

TLV6001IDBVR

R35

TP55

TP45

TP65

TP4

TP5

TP6

TP8

TP85

INA190EVM Schematic and PCB Layout

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INA190EVM User's Guide

Figure 3. INA190EVM Schematic - Gain A5 and Guarding Panels

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