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

2 Overview

The INA23x devices are digital power monitors with integrated 16-bit (INA232, INA236) and 12-bit (INA234) delta-sigma ADCs specifically designed for current-sensing applications. The devices can measure a selectable full-scale differential input of ±81.92 mV or ±20.48 mV across the shunt with common-mode voltage support from –0.3 V to +48 V (–0.3 V to +28 V for INA234). The built-in digital accumulation calculates average power and current if calibration register is programmed. The INA23x devices also have built-in diagnostics to indicate system health accessible through a digital output pin, ALERT. The output can be interfaced with a multitude of micro controllers (MCUs) with a standard I2C interface.

Table 2-1 Device Summary
PRODUCTDIGITAL PROTOCOLADC RESOLUTIONMAX GAIN ERRORMAX OFFSET VOLTAGE
INA232I2C16-bit0.25%±20 µV
INA234I2C12-bit0.5%±100 µV
INA236I2C16-bit0.1%±5 µV