SBOSA20A February   2021  – May 2022 INA237

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 Versatile High Voltage Measurement Capability
      2. 7.3.2 Power Calculation
      3. 7.3.3 Low Bias Current
      4. 7.3.4 High-Precision Delta-Sigma ADC
        1. 7.3.4.1 Low Latency Digital Filter
        2. 7.3.4.2 Flexible Conversion Times and Averaging
      5. 7.3.5 Integrated Precision Oscillator
      6. 7.3.6 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 INA237 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 Input Filtering 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
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
  11. 11Device and Documentation Support
    1. 11.1 Receiving Notification of Documentation Updates
    2. 11.2 Support Resources
    3. 11.3 Trademarks
    4. 11.4 Electrostatic Discharge Caution
    5. 11.5 Glossary
  12. 12Mechanical, Packaging, and Orderable Information

Package Options

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

6.5 Electrical Characteristics

at TA = 25 °C, VS = 3.3 V, VSENSE = VIN+ – VIN– = 0 V, VCM = VIN– = 48 V (unless otherwise noted)
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
INPUT
VCM Common-mode input range TA = –40°C to +125°C –0.3 85 V
VVBUS Bus voltage input range 0 85 V
CMRR Common-mode rejection –0.3 V < VCM < 85 V, TA = –40°C to +125°C 120 140 dB
VDIFF Shunt voltage input range TA = –40°C to +125°C, ADCRANGE = 0 –163.84 163.84 mV
TA = –40°C to +125°C, ADCRANGE = 1 –40.96 40.96 mV
Vos Shunt offset voltage VCM = 0 V ±15 ±50 µV
dVos/dT Shunt offset voltage drift TA = –40°C to +125°C ±2 ±20 nV/°C
PSRR Shunt offset voltage vs power supply VS = 2.7 V to 5.5 V, TA = –40°C to +125°C ±0.1 ±1 µV/V
Vos_bus VBUS offset voltage VBUS = 20 mV ±1 ±5 mV
dVos/dT VBUS offset voltage drift TA = –40°C to +125°C ±20 ±100 µV/°C
PSRR VBUS offset voltage vs power supply VS = 2.7 V to 5.5 V ±1.1 mV/V
IB Input bias current Either input, IN+ or IN–, VCM = 85 V 0.1 2.5 nA
ZVBUS VBUS pin input impedance Active mode 0.8 1 1.2 MΩ
IVBUS VBUS pin leakage current Shutdown mode, VBUS = 85 V 10 nA
RDIFF Input differential impedance Active mode, VIN+ – VIN– < 164 mV 92 kΩ
DC ACCURACY
GSERR Shunt voltage gain error ±0.1 ±0.3 %
GS_DRFT Shunt voltage gain error drift ±50 ppm/°C
GBERR VBUS voltage gain error ±0.1 ±0.3 %
GB_DRFT VBUS voltage gain error drift ±50 ppm/°C
PTME Power total measurement error (TME) TA = –40°C to +125°C, at full scale ±1.6 %
ADC resolution 16 Bits
1 LSB step size Shunt voltage, ADCRANGE = 0 5 µV
Shunt voltage, ADCRANGE = 1 1.25 µV
Bus voltage 3.125 mV
Temperature 125 m°C
TCT ADC conversion-time(1) Conversion time field = 0h  50 µs
Conversion time field = 1h  84
Conversion time field = 2h  150
Conversion time field = 3h  280
Conversion time field = 4h  540
Conversion time field = 5h 1052
Conversion time field = 6h 2074
Conversion time field = 7h  4120
INL Integral Non-Linearity ±2 m%
DNL Differential Non-Linearity 0.2 LSB
CLOCK SOURCE
FOSC Internal oscillator frequency 1 MHz
FOSC_TOL Internal oscillator frequency tolerance TA = 25°C ±0.5 %
TA = –40°C to +125°C ±1 %
TEMPERATURE SENSOR
Measurement range –40 +125 °C
Temperature accuracy TA = 25°C ±0.15 ±1 °C
TA = –40°C to +125°C ±0.2 ±2 °C
POWER SUPPLY
VS Supply voltage 2.7 5.5 V
IQ Quiescent current VSENSE = 0 V 640 750 µA
VSENSE = 0 V, TA = –40°C to +125°C 1.1 mA
IQSD Quiescent current, shutdown Shutdown mode 2.8 5 µA
TPOR Device start-up time Power-up (NPOR) 300 µs
From shutdown mode 60
DIGITAL INPUT / OUTPUT
VIH Logic input level, high SDA, SCL 1.2 5.5 V
VIL Logic input level, low GND 0.4 V
VOL Logic output level, low IOL = 3 mA GND 0.4 V
IIO_LEAK Digital leakage input current 0 ≤ VIN ≤ VS –1 1 µA
(1) Subject to oscillator accuracy and drift