JAJSOF3A May   2023  – September 2023 INA700

PRODUCTION DATA  

  1.   1
  2. 特長
  3. アプリケーション
  4. 概要
  5. Revision History
  6. Pin Configuration and Functions
  7. Specifications
    1. 6.1 Absolute Maximum Ratings
    2. 6.2 ESD Ratings
    3. 6.3 Recommended Operating Conditions
    4. 6.4 Thermal Information
    5. 6.5 Electrical Characteristics
    6. 6.6 Timing Requirements (I2C)
    7. 6.7 Timing Diagram
    8. 6.8 Typical Characteristics
  8. Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 Integrated Shunt Resistor
      2. 7.3.2 Safe Operating Area
      3. 7.3.3 Versatile Measurement Capability
      4. 7.3.4 Internal Measurement and Calculation Engine
      5. 7.3.5 High-Precision Delta-Sigma ADC
        1. 7.3.5.1 Low Latency Digital Filter
        2. 7.3.5.2 Flexible Conversion Times and Averaging
      6. 7.3.6 Integrated Precision Oscillator
      7. 7.3.7 Multi-Alert Monitoring and Fault Detection
    4. 7.4 Device Functional Modes
      1. 7.4.1 Shutdown Mode
      2. 7.4.2 Power-On Reset
    5. 7.5 Programming
      1. 7.5.1 I2C Serial Interface
        1. 7.5.1.1 Writing to and Reading Through the I2C Serial Interface
        2. 7.5.1.2 High-Speed I2C Mode
        3. 7.5.1.3 SMBus Alert Response
    6. 7.6 Register Maps
      1. 7.6.1 INA700 Registers
  9. Application and Implementation
    1. 8.1 Application Information
      1. 8.1.1 Device Measurement Range and Resolution
      2. 8.1.2 ADC Output Data Rate and Noise Performance
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Procedure
        1. 8.2.2.1 Configure the Device
        2. 8.2.2.2 Set Desired Fault Thresholds
        3. 8.2.2.3 Calculate Returned Values
      3. 8.2.3 Application Curves
  10. Power Supply Recommendations
  11. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
  12. 11Device and Documentation Support
    1. 11.1 Documentation Support
      1. 11.1.1 Related Documentation
    2. 11.2 ドキュメントの更新通知を受け取る方法
    3. 11.3 サポート・リソース
    4. 11.4 Trademarks
    5. 11.5 静電気放電に関する注意事項
    6. 11.6 用語集
  13. 12Mechanical, Packaging, and Orderable Information

パッケージ・オプション

メカニカル・データ(パッケージ|ピン)
サーマルパッド・メカニカル・データ
発注情報

Integrated Shunt Resistor

The INA700 is a precise, low-drift, digital power monitor that provides accurate measurements over the entire specified ambient temperature range of –40°C to +105°C. The integrated current-sensing resistor is internally compensated to provide measurement stability over temperature, while simplifying printed circuit board (PCB) layout and size constraints. Figure 7-2 shows the device gain error as a function of current.

The IN+ and IN– pins allow access to the on-chip current-sensing resistor. This resistor features internal sense connections that are factory-calibrated and temperature-compensated to achieve a high level of accuracy. The INA700 is system-calibrated so that the current-sensing resistor and current-sensing amplifier are both precisely matched to one another.

The nominal pin-to-pin resistance from IN+ to IN– is approximately 3.6 mΩ, while the internal resistance seen by the digital power monitor is nominally 2 mΩ. The power dissipation requirements of the system and package are based on the total package resistance between the IN+ and IN– pins. The material composition of the internal shunt has a resistance that increases with temperature as shown in Figure 7-1.

GUID-20230601-SS0I-N4RF-R0WL-KDVKVTG3GS1P-low.svgFigure 7-1 IN+ to IN– Package Resistance vs Temperature

The internal compensation of the INA700 corrects for pin-to-pin resistance increases with temperature, achieving less than 50 ppm/°C drift over the ambient temperature range.

The INA700 is most accurate when measuring currents around 5 A. As currents increase the error in the current measurement also increases. Figure 7-2 below shows how the gain error of the INA700 varies with the shunt current.

GUID-20230419-SS0I-5HZJ-ZRGD-TL03VRKTMNSB-low.svgFigure 7-2 Gain Error vs Shunt Current

The change in gain error is consistent enough from device to device that returned values can be scaled up or down depending on the shunt current to give a more accurate result. For example, to achieve higher accuracy when measuring currents around 7 A, the returned value can be scaled down by approximately 0.4%.