SBOU128B february   2013  – july 2023 INA231

 

  1.   1
  2.   INA231EVM Evaluation Board and Software Tutorial
  3.   Trademarks
  4. 1Overview
    1. 1.1 INA231EVM Kit Contents
    2. 1.2 Related Documentation from Texas Instruments
  5. 2INA231EVM Hardware
    1. 2.1 Theory of Operation for INA231 Hardware
    2. 2.2 Signal Definitions of H1 (10-Pin Connector Socket)
      1. 2.2.1 Theory of Operation for SM-USB-DIG Platform
  6. 3INA231EVM (Rev A) Hardware Setup
    1. 3.1 Electrostatic Discharge Warning
    2. 3.2 Connecting the Hardware
    3. 3.3 Connecting Power
    4. 3.4 Connecting the USB Cable to the SM-USB-DIG Platform
    5. 3.5 INA231EVM Default Jumper Settings
    6. 3.6 INA231EVM Features
      1. 3.6.1 J2: I2C VS Control Setting
      2. 3.6.2 J3 and J4: I2C Address Hardware Setting (A0)
      3. 3.6.3 J5 and J6: I2C Address Hardware Setting (A1)
      4. 3.6.4 External I2C Lines and Terminal Block T1
      5. 3.6.5 VIN+ and VIN– Input filter (R1, R2, and C1)
      6. 3.6.6 Shunt Monitor Configuration and Terminal Blocks T3 and T4
  7. 4INA231EVM Software Setup
    1. 4.1 Operating Systems for the INA231EVM Software
    2. 4.2 Software Installation
  8. 5INA231EVM Software Overview
    1. 5.1 Starting the INA231EVM Software
    2. 5.2 Configuring the INA231EVM Software
      1. 5.2.1 I2C Address Selection
      2. 5.2.2 Configure Operating Mode
      3. 5.2.3 Set Conversion Times
      4. 5.2.4 Set Configuration Register
      5. 5.2.5 Configuring the Alert Pin
    3. 5.3 Using the INA231EVM Software
      1. 5.3.1 INA231 Bus Voltage, Shunt Voltage, Current, and Power Reading Bar
      2. 5.3.2 Calculation and Theory of Operation
      3. 5.3.3 Register Tab
      4. 5.3.4 Graph Tab
      5. 5.3.5 Auto-Write and the Supply Voltage
  9. 6INA231EVM Documentation
    1. 6.1 Schematic
    2. 6.2 PCB Layout
    3. 6.3 Bill of Materials
  10. 7Revision History

5.2.4 Set Configuration Register

The user must set the Configuration Register correctly for the software to operate properly. There are two methods used to set the Configuration Register: first, the user can manually calculate the desired value and then input that value into the register table, as shown in Equation 1. Alternatively, the user can allow the software to create a recommended window and choose an LSB for the current as shown in Figure 5-7. Both methods accomplish the same goal by using Equation 1, but the method is selected by changing the value in Step 4: Select Configuration Method (as Figure 5-6 and Figure 5-7 show).

Equation 1. GUID-559FFE0A-42C9-4176-B300-50E893DD3821-low.gif

The current LSB is calculated by a recommended range in the INA231 data sheet as shown in Equation 2. It is important to note that with either of the methods used, the Current LSB and the Calibration Register values are calculated based on the other variable and the RSHUNT value. See the section Programming the INA231 in the product data sheet for more information on setting the Calibration Register value.

Equation 2. GUID-BBC0A021-19A7-443F-8D5C-DABE0858FA9F-low.gif
GUID-BBD77E43-F104-43CE-9B97-098AC029269B-low.gifFigure 5-6 Setting the Configuration Register (Calibration Register)
GUID-1529E209-8B76-4CB5-A7C0-E6262E630001-low.gifFigure 5-7 Setting the Configuration Register (Current LSB)