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Operation
4.2.2.2 With Shunt Resistor
To configure a measurement evaluation with a shunt resistor, follow these steps:
1. Connect a shunt resister by doing either of the following:
a. Solder a 2512 resistor across the pads of R1 that connects the IN+ and IN– inputs.
b. Connect an external shunt across the IN+ and IN– terminals of J1, preferably across pins 4 and 5, as
shown in
Figure
4-11.
i.
If an external shunt is being used, make the connections such that the sensing location is across
the shunt and there will be no high current on the sensing path. See the
Sense Amplifiers: Shunt Resistor Layout
2. Connect the IN+ and IN– terminals in series with the load while powered off.
If measuring current, first make sure that the equipment (shunt resistor, wires, connectors, and
so on) can support the amperage and power dissipation. Secondly, make sure that the current
flowing through J1 does not exceed 10 A. Failure to do so can result in damage to the EVM, or
personal injury.
Do not touch high voltage terminals.
The EVM may get hot.
3. Connect the VBUS terminal (J1 pin 2) to the desired bus voltage (likely either IN+ or IN–).
4. Connect the system ground to the GND terminal (J1 pin 1).
5. Power on the system, and observe the device states and outputs through the GUI.
12
INA234EVM and INA236EVM
video for more information.
Figure 4-11. IN+ and IN– Wiring With a Shunt Resistor
WARNING
Copyright © 2021 Texas Instruments Incorporated
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TI Precision Labs - Current
SBOU264 – MAY 2021
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