SBOS844C May   2021  – March 2023 INA234

PRODUCTION DATA  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Pin Configuration and Functions
  6. 6 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
  7. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 Integrated Analog-to-Digital Convertor (ADC)
      2. 7.3.2 Power Calculation
      3. 7.3.3 Low Bias Current
      4. 7.3.4 Low Voltage Supply and Wide Common-Mode Voltage Range
      5. 7.3.5 ALERT Pin
    4. 7.4 Device Functional Modes
      1. 7.4.1 Continuous Verses Triggered Operation
      2. 7.4.2 Device Shutdown
      3. 7.4.3 Power-On Reset
      4. 7.4.4 Averaging and Conversion Time Considerations
    5. 7.5 Programming
      1. 7.5.1 I2C Serial Interface
      2. 7.5.2 Writing to and Reading Through the I2C Serial Interface
      3. 7.5.3 High-Speed I2C Mode
      4. 7.5.4 General Call Reset
      5. 7.5.5 General Call Start Byte
      6. 7.5.6 SMBus Alert Response
    6. 7.6 Register Maps
      1. 7.6.1 Device Registers
  8. 8 Application and Implementation
    1. 8.1 Application Information
      1. 8.1.1 Device Measurement Range and Resolution
      2. 8.1.2 Current and Power Calculations
      3. 8.1.3 ADC Output Data Rate and Noise Performance
      4. 8.1.4 Filtering and Input Considerations
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Procedure
        1. 8.2.2.1 Select the Shunt Resistor
        2. 8.2.2.2 Configure the Device
        3. 8.2.2.3 Program the Shunt Calibration Register
        4. 8.2.2.4 Set Desired Fault Thresholds
        5. 8.2.2.5 Calculate Returned Values
      3. 8.2.3 Application Curves
    3. 8.3 Power Supply Recommendations
    4. 8.4 Layout
      1. 8.4.1 Layout Guidelines
      2. 8.4.2 Layout Example
  9. 9 Device and Documentation Support
    1. 9.1 Device Support
      1. 9.1.1 Development Support
    2. 9.2 Documentation Support
      1. 9.2.1 Related Documentation
    3. 9.3 Receiving Notification of Documentation Updates
    4. 9.4 Support Resources
    5. 9.5 Trademarks
    6. 9.6 Electrostatic Discharge Caution
    7. 9.7 Glossary
  10. 10Mechanical, Packaging, and Orderable Information

Package Options

Refer to the PDF data sheet for device specific package drawings

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

8.2.2.5 Calculate Returned Values

Table 8-4 below shows the register values assuming the design requirements shown in Table 8-3. User programmed values for the Configuration, Calibration, Mask/Enable and Alert limit registers are shown, as well as, the returned values for shunt voltage, current, bus voltage and power. Parametric values are calculated by multiplying the returned value by the LSB value.

Returned values for shunt voltage, current, and bus voltage need to be right shifted by 4, or divided by 16 to the correct 12-bit value before multiplying by the LSB value. The shifting is needed because the bottom 4 bits in the returned values are reserved and are always 0.

Table 8-4 Calculate Returned Values
Register Name Contents Right Shifted 12 - bit Value LSB Value Calculated Value
Configuration (0h) 16679d (4127h) — — —
Calibration (5h) 2048d (800h) — — —
Mask/Enable (6h) 32768 (8000h) — — —
Alert Limit (7h) 28800d (7080h) 1800d (708h) 40 μV/LSB 1800 × 40 μV = 0.072 V
Shunt Voltage (1h) 19200d (4B00h) 1200d (4B0h) 40 µV/LSB 1200 × 40 µV = 0.048 V
Bus Voltage (2h) 7500d (1D4Ch) 468d (1D4h) 25.6 mV/LSB 468 × 25.6 mV = 11.98 V
Current (4h) 19200d (4B00h) 1200d (4B0h) 5 mA/LSB 1200 × 5 mA = 6 A
Power (3h) 450d (1C2h) — Current LSB x 32 = 160 mW/LSB 450 × 160 mW = 72 W

Shunt Voltage and Current return values in two's complement format. In two's complement format a negative value in binary is represented by having a 1 in the most significant bit of the returned value. These values can be converted to decimal by first inverting all the bits and adding 1 to obtain the unsigned binary value. This value should then be converted to decimal with the negative sign applied.