Quick Start Setup and Use
4
SBOU201A – April 2018 – Revised September 2018
Copyright © 2018, Texas Instruments Incorporated
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
.
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.
