SBOU264B May   2021  – December 2022 INA232 , INA234 , INA236

 

  1.   Abstract
  2. 1Trademarks
  3. 2Overview
    1. 2.1 Kit Contents
    2. 2.2 Related Documentation From Texas Instruments
  4. 3Hardware
    1. 3.1 Features
  5. 4Operation
    1. 4.1 Quick Start Setup
    2. 4.2 EVM Operation
      1. 4.2.1 Setup
        1. 4.2.1.1 Driver Installation
        2. 4.2.1.2 Firmware
          1. 4.2.1.2.1 Firmware Debug
        3. 4.2.1.3 GUI Setup and Connection
          1. 4.2.1.3.1 Initial Setup
          2. 4.2.1.3.2 GUI to EVM Connection
      2. 4.2.2 GUI Operation
        1. 4.2.2.1 Homepage Tab
        2. 4.2.2.2 Configuration Tab
        3. 4.2.2.3 Registers Tab
        4. 4.2.2.4 Results Data Tab
      3. 4.2.3 Current Sensing Operation
        1. 4.2.3.1 Without Shunt Resistor
        2. 4.2.3.2 With Shunt Resistor
      4. 4.2.4 Direct EVM USB Communication
        1. 4.2.4.1 Standard USB CDC Read and Write Operations
        2. 4.2.4.2 Collect Data Through the USB BULK Channel
  6. 5Circuitry
    1. 5.1 Current Sensing IC
    2. 5.2 Input Signal Path
    3. 5.3 Digital Circuitry
      1. 5.3.1 I2C
  7. 6Schematics, PCB Layout, and Bill of Materials
    1. 6.1 Schematics
      1. 6.1.1 SENS079 (INA234EVM, INA236EVM)
      2. 6.1.2 SENS090 (INA232EVM)
    2. 6.2 PCB Layout
      1. 6.2.1 SENS079 (INA234EVM, INA236EVM)
      2. 6.2.2 SENS090 (INA232EVM)
    3. 6.3 Bill of Materials
      1. 6.3.1 SENS079 (INA234EVM, INA236EVM)
      2. 6.3.2 SENS090 (INA232EVM)
  8. 7Revision History

5.2 Input Signal Path

This section describes the circuitry of the input signal path.

J1 is the main connection terminal. Pin 1 of J1 is used to tie the system ground to the EVM ground. Pin 2 of J1 is used for the VBUS measurement within the sensor. Pins 3 and 4 are tied to IN–, and Pins 5 and 6 are tied to IN+. There are two pins each for IN– and IN+ for convenience.

R1 can be used for an optional onboard shunt resistor with a 2512 footprint. Alternatively, a shunt can be placed across the IN+ and IN– terminals of J1. If desired, a differential voltage can be applied directly for measurement tests.

C3, R2, and R3 combine to make an optional input filter. R2 and R3 are populated with 0-Ω resistors by default. When using input filtering, take into account the input bias current of the device.