SBOA539 January   2023 INA219 , INA232

 

  1.   Abstract
  2.   Trademarks
  3. 1Overview
    1. 1.1 INA232 and INA219
  4. 2Migrating From INA219 to INA232
    1. 2.1 Package Selection and Pinout
    2. 2.2 Device Address
    3. 2.3 Shunt Voltage Range
    4. 2.4 Power Supply and IO Voltage Levels
    5. 2.5 Digital Interface and Data Format
    6. 2.6 Register Set
    7. 2.7 Accuracy
    8. 2.8 Unique Features
  5. 3Implementation
    1. 3.1 Identify Suitable Migration Projects
    2. 3.2 Bench Setup and Hardware
    3. 3.3 Result Registers and Calculation
    4. 3.4 Software Implementation

3.3 Result Registers and Calculation

The controller reads results registers, including Shunt, Bus, Power, and Current continuously. Because of the differences in register effective bit-width and bit-weight, the math is slightly different in converting the register values into physical quantities. Table 3-2 shows the relevant information needed for results conversion. The differences between INA232 and INA219 are listed under each device column separately

Table 3-2 Result Calculation
Results and Calculation INA219 INA232
Shunt voltage Register 01h
LSB 10 μV 2.5 μV
Data format Two's compliment
Magnitude Lower 13 bits Lower 15 bits
Sign Any of upper 3 bits MSB
Bus voltage Register 02h
LSB 4 mV 1.6 mV
Data format Positive only
Magnitude Upper 13 bits (<<3) Lower 14 bits
Sign N/A
Power Register 03h
LSB 20 mW 32 mW
Data format Positive only
Magnitude 16 bits
Sign N/A
Current Register 04h
LSB 1 mA
Data format Two's compliment
Magnitude Lower 14 bits
Sign MSB