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

1 Overview

A digital power monitor is specially designed for current sensing applications, with an integrated analog-to-digital converter that is able to withstand common-mode voltages that are much higher than the device power supply itself. As a result, the digital power monitor can be directly interfaced with the circuit being measured.

Digital power monitors extract the small differential shunt voltage from a normally high common-mode voltage rail. This shunt voltage is proportional to the load current supplied by the voltage rail. The common mode (Bus) voltage is also measured. With these two measurements, the power monitors calculate the current, voltage, and power. These quantities are available as bit streams and available through the digital interface. Figure 1-1 shows a block diagram of a typical power monitor with I2C digital interface.

Figure 1-1 Block Diagram of a Digital Power Monitor