SLVSLZ7 October   2026

 

  1.   1
  2.   Description
  3.   Get Started
  4.   Features
  5.   5
  6. 1Evaluation Module Overview
    1. 1.1 Introduction
    2. 1.2 Kit Contents
    3. 1.3 Specification
    4. 1.4 Device Information
  7. 2Hardware
    1. 2.1 Quick Start Setup
    2. 2.2 EVM Operation
      1. 2.2.1 Current Sensing Operation
        1. 2.2.1.1 Detailed Setup
    3. 2.3 Circuitry
      1. 2.3.1 Current Sensing IC
      2. 2.3.2 Input Signal Path
      3. 2.3.3 Digital Circuitry
    4. 2.4 PAMB Compatibility
  8. 3Software
    1. 3.1 Setup
      1. 3.1.1 Driver Installation
      2. 3.1.2 Firmware
        1. 3.1.2.1 Firmware Debug
      3. 3.1.3 GUI Setup and Connection
        1. 3.1.3.1 Initial Setup
        2. 3.1.3.2 GUI to EVM Connection
    2. 3.2 GUI Operation
      1. 3.2.1 Homepage Tab
      2. 3.2.2 Registers Tab
      3. 3.2.3 Results Data Tab
    3. 3.3 Direct EVM USB Communication
      1. 3.3.1 Standard USB Read and Write Operations
      2. 3.3.2 Collect Data Through the USB BULK Channel
  9. 4Hardware Design Files
    1. 4.1 Schematics
    2. 4.2 PCB Layout
    3. 4.3 Bill of Materials
  10. 5Additional Information
    1. 5.1 Trademarks
  11. 6Related Documentation

2.2.1.1 Detailed Setup

To configure a measurement evaluation, follow these steps:

  1. Connect a shunt resistor by doing either of the following:
    1. Solder a 2512 resistor across the pads of R1, R2 or R3 that connects the IN+ and IN– inputs as shown in Figure 2-4.
    2. Connect an external shunt across the IN+ and IN– terminals of J1 as shown in Figure 2-3.
      1. If an external shunt is being used, then make the connections such that the sensing location is across the shunt and there is no high current on the sensing path. See the TI Precision Labs - Current Sense Amplifiers: Shunt Resistor Layout video for more information.
  2. Connect the IN+ and IN– terminals in series with the load while powered off.
    1. When measuring more than 10A, verify that the high current path does not go through the EVM (including the terminal block J1), as shown in Figure 2-3.
      INA3221EVM IN+ and IN– Wiring for More Than 10AFigure 2-3 IN+ and IN– Wiring for More Than 10A
      INA3221EVM IN+ and IN– Wiring for 10A or LessFigure 2-4 IN+ and IN– Wiring for 10A or Less
      WARNING:

      When 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 10A per channel. Failure to do so can result in damage to the EVM, or personal injury.

      The EVM can get hot.

  3. Connect the VBUS terminal to the desired bus voltage (likely either IN+ or IN–).

    1. If VBUS and dependent features are not being used, then this channel can be used as an ADC input for another voltage.

  4. Connect the system ground to either of the GNDs on terminals J1.
  5. Power on the system and observe the device states and outputs through the GUI.