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INA745x 40 V, 16-Bit, Precision I2C Output Digital Power Monitor with EZShunt Technology
SBOSAC3A
July 2023 – December 2023
INA745A
,
INA745B
PRODMIX
CONTENTS
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INA745x 40 V, 16-Bit, Precision I2C Output Digital Power Monitor with EZShunt Technology
1
1
Features
2
Applications
3
Description
4
Pin Configuration and Functions
5
Specifications
5.1
Absolute Maximum Ratings
5.2
ESD Ratings
5.3
Recommended Operating Conditions
5.4
Thermal Information
5.5
Electrical Characteristics
5.6
Timing Requirements (I2C)
5.7
Timing Diagram
5.8
Typical Characteristics
6
Detailed Description
6.1
Overview
6.2
Functional Block Diagram
6.3
Feature Description
6.3.1
Integrated Shunt Resistor
6.3.2
Safe Operating Area
6.3.3
Versatile Measurement Capability
6.3.4
Internal Measurement and Calculation Engine
6.3.5
High-Precision Delta-Sigma ADC
6.3.5.1
Low Latency Digital Filter
6.3.5.2
Flexible Conversion Times and Averaging
6.3.6
Integrated Precision Oscillator
6.3.7
Multi-Alert Monitoring and Fault Detection
6.4
Device Functional Modes
6.4.1
Shutdown Mode
6.4.2
Power-On Reset
6.5
Programming
6.5.1
I2C Serial Interface
6.5.1.1
Writing to and Reading Through the I2C Serial Interface
6.5.1.2
High-Speed I2C Mode
6.5.1.3
SMBus Alert Response
7
Application and Implementation
7.1
Application Information
7.1.1
Device Measurement Range and Resolution
7.1.2
ADC Output Data Rate and Noise Performance
7.2
Typical Application
7.2.1
Design Requirements
7.2.2
Detailed Design Procedure
7.2.2.1
Configure the Device
7.2.2.2
Set Desired Fault Thresholds
7.2.2.3
Calculate Returned Values
7.2.3
Application Curves
7.3
Power Supply Recommendations
7.4
Layout
7.4.1
Layout Guidelines
7.4.2
Layout Example
7.5
Register Maps
7.5.1
INA745x Registers
8
Device and Documentation Support
8.1
Receiving Notification of Documentation Updates
8.2
Support Resources
8.3
Trademarks
8.4
Electrostatic Discharge Caution
8.5
Glossary
9
Revision History
10
Mechanical, Packaging, and Orderable Information
IMPORTANT NOTICE
Package Options
Mechanical Data (Package|Pins)
REL|14
MPQF697
Thermal pad, mechanical data (Package|Pins)
Orderable Information
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Data Sheet
INA745x
40 V
,
16
-Bit,
Precision
I
2
C
Output Digital Power Monitor with
EZShunt
Technology
1
Features
Low loss integrated shunt resistor
Internal resistance:
800 µΩ
, T
A
= 25°C
Continuous current:
±35 A
, T
A
= 25°C
Peak measurement capability:
±39.32 A
Current monitoring accuracy:
A/B Grade, maximum
Offset current:
±6.25 mA / ±62.5 mA
Offset drift:
±30 µA/°C (A and B Grades)
System gain error:
±0.75% / ±1.25%
Common-mode rejection:
±0.125 / ±1.25 mA/V
Power monitoring accuracy:
A/B Grade, maximum
±0.9% / ±1.6%
at 25°C, full scale
Energy and charge accuracy:
A/B Grade, maximum
±1.4% / ±2.1%
at 25°C, full scale
Temperature sensor: ±1.5°C (maximum at 25°C)
Precision oscillator: ±0.5% (maximum at 25°C)
Programmable conversion time and averaging
2.94-MHz high-speed I
2
C interface with 16 pin-selectable addresses
Operates from a 2.7-V to 5.5-V supply:
Operational current: 640 µA (typical)
Shutdown current: 5 µA (maximum)
2
Applications
Power delivery
Grid infrastructure
Industrial battery packs
Test equipment
Telecom equipment
Enterprise servers