SBOU241E April   2020  – August 2022 INA228 , INA229 , INA237 , INA238 , INA239

 

  1.   SBOU241 Abstract
  2. 1Trademarks
  3.   General Texas Instruments High Voltage Evaluation (TI HV EVM) User Safety Guidelines
  4. 2Overview
    1. 2.1 Kit Contents
    2. 2.2 Related Documentation From Texas Instruments
  5. 3Hardware
    1. 3.1 Features
  6. 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 Detailed Setup
      4. 4.2.4 Direct EVM USB Communication
        1. 4.2.4.1 Standard USB Read and Write Operations
        2. 4.2.4.2 Collect Data Through the USB BULK Channel
      5. 4.2.5 PAMB Compatibility
  7. 5Circuitry
    1. 5.1 Current Sensing IC
    2. 5.2 Input Signal Path
    3. 5.3 Digital Circuitry
      1. 5.3.1 I2C (INA228, INA237, INA238)
      2. 5.3.2 SPI (INA229, INA239)
  8. 6Schematics, PCB Layout, and Bill of Materials
    1. 6.1 Schematics
      1. 6.1.1 SENS063 (INA228EVM, INA237EVM, INA238EVM)
      2. 6.1.2 SENS064 (INA229EVM, INA239EVM)
    2. 6.2 PCB Layout
      1. 6.2.1 SENS063 (INA228EVM, INA237EVM, INA238EVM)
      2. 6.2.2 SENS064 (INA229EVM, INA239EVM)
    3. 6.3 Bill of Materials
      1. 6.3.1 SENS063 (INA228EVM, INA237EVM, INA238EVM)
      2. 6.3.2 SENS064 (INA229EVM, INA239EVM)
  9. 7Revision History

2 Overview

The INA228, INA229, INA237, INA238, and INA239 devices are digital power monitors with integrated 20-bit (INA229 and INA228) and 16-bit (INA237, INA238, and INA239) delta-sigma ADCs specifically designed for current-sensing applications. The devices can measure a selectable full-scale differential input of ±163.84 mV or ±40.96 mV across the shunt with common-mode voltage support from –0.3 V to +85 V. For the INA228 and INA229, built-in digital accumulation calculates average power, internal die temperature, energy, and charge accumulation. For the INA237, INA238, and INA239, built-in digital accumulation calculates average power and internal die temperature. All devices also have built-in diagnostics to indicate system health accessible through a digital output pin, ALERT. The devices operate from a single supply of 2.7 V to 5.5 V, drawing < 1.1-mA current during operation and < 5-µA current during shutdown. The output can be interfaced with a multitude of microcontrollers (MCUs) with a standard 4-wire SPI interface (INA229 and INA239) or with a standard I2C interface (INA228, INA237, and INA238).

Table 2-1 Device Summary
PRODUCTDIGITAL PROTOCOLADC RESOLUTIONMAX GAIN ERRORMAX OFFSET VOLTAGE
INA228I2C20-bit0.05%±1 µV
INA229SPI20-bit0.05%±1 µV
INA237I2C16-bit0.3%±50 µV
INA238I2C16-bit0.1%±5 µV
INA239SPI16-bit0.1%±5 µV