SBOSAM2 August   2025 INA701

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Pin Configuration and Functions
  6. 5 Specifications
    1. 5.1 Absolute Maximum Ratings
    2. 5.2 ESD Ratings
    3. 5.3 Recommended Operating Conditions
    4. 5.4 Thermal Information
    5. 5.5 Electrical Characteristics
    6. 5.6 Timing Requirements (I2C)
    7. 5.7 Timing Diagram
    8. 5.8 Typical Characteristics
  7. 6 Detailed Description
    1. 6.1 Overview
    2. 6.2 Functional Block Diagram
    3. 6.3 Feature Description
      1. 6.3.1 Integrated Shunt Resistor
      2. 6.3.2 Safe Operating Area
      3. 6.3.3 Versatile Measurement Capability
      4. 6.3.4 Internal Measurement and Calculation Engine
      5. 6.3.5 High-Precision Delta-Sigma ADC
        1. 6.3.5.1 Low Latency Digital Filter
        2. 6.3.5.2 Flexible Conversion Times and Averaging
      6. 6.3.6 Integrated Precision Oscillator
      7. 6.3.7 Multi-Alert Monitoring and Fault Detection
    4. 6.4 Device Functional Modes
      1. 6.4.1 Shutdown Mode
      2. 6.4.2 Power-On Reset
    5. 6.5 Programming
      1. 6.5.1 I2C Serial Interface
        1. 6.5.1.1 Writing to and Reading Through the I2C Serial Interface
        2. 6.5.1.2 High-Speed I2C Mode
        3. 6.5.1.3 SMBus Alert Response
    6. 6.6 Register Maps
      1. 6.6.1 INA701 Registers
  8. 7 Application and Implementation
    1. 7.1 Application Information
      1. 7.1.1 Device Measurement Range and Resolution
      2. 7.1.2 ADC Output Data Rate and Noise Performance
    2. 7.2 Typical Application
      1. 7.2.1 Design Requirements
      2. 7.2.2 Detailed Design Procedure
        1. 7.2.2.1 Configure the Device
        2. 7.2.2.2 Set Desired Fault Thresholds
        3. 7.2.2.3 Calculate Returned Values
      3. 7.2.3 Application Curves
  9. 8 Power Supply Recommendations
  10. 9 Layout
    1. 9.1 Layout Guidelines
    2. 9.2 Layout Example
  11. 10Device and Documentation Support
    1. 10.1 Documentation Support
      1. 10.1.1 Related Documentation
    2. 10.2 Receiving Notification of Documentation Updates
    3. 10.3 Support Resources
    4. 10.4 Trademarks
    5. 10.5 Electrostatic Discharge Caution
    6. 10.6 Glossary
  12. 11Revision History
  13. 12Mechanical, Packaging, and Orderable Information

Package Options

Refer to the PDF data sheet for device specific package drawings

Mechanical Data (Package|Pins)
  • YWF|8
Thermal pad, mechanical data (Package|Pins)
Orderable Information

6.3.1 Integrated Shunt Resistor

The INA701 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 6-2 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 INA701 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 7mΩ, while the internal resistance seen by the digital power monitor is nominally 5mΩ. 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 6-1.

INA701 IN+ to IN– Package Resistance vs Temperature Figure 6-1 IN+ to IN– Package Resistance vs Temperature

The internal compensation of the INA701 corrects for pin-to-pin resistance increases with temperature, achieving less than 50ppm/°C drift over the ambient temperature range.

The INA701 is most accurate when measuring currents in the range of 0.1A to 3A. As currents increase the error in the current measurement also increases. Figure 6-2 below shows how the gain error of the INA701 stays under 0.4% for the shunt current range of 0.1A to 2.5A.

INA701 Gain Error vs Shunt Current Figure 6-2 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 5A, the returned value can be scaled down by approximately 2% as shown in Figure 6-3.

INA701 Gain Error vs Shunt Current (Full Range) Figure 6-3 Gain Error vs Shunt Current (Full Range)