Overview
The INA226, produced by Texas Instruments, is a high-precision current shunt and power monitor with an I2C or SMBUS-compatible interface. This device is designed to monitor both shunt voltage drops and bus supply voltages, providing accurate readings of current, voltage, and power. The INA226 operates from a single 2.7V to 5.5V power supply and draws a typical supply current of 330 µA. It is specified over an operating temperature range of -40°C to 125°C, making it versatile for various applications.
The INA226EVM is an evaluation module designed to evaluate the performance of the INA226 under different signal, shunt, and supply conditions. It includes a graphical user interface (GUI) for reading and writing device registers, as well as viewing and saving results data. The EVM supports current measurements up to 10 amps and is an essential tool for developers to assess the main features and performance of the INA226.
Key Specifications
| Parameter | Description |
|---|---|
| Digital Protocol | I2C or SMBUS-compatible |
| ADC Resolution | 16-bit |
| Max Gain Error | 0.1% |
| Max Offset Voltage | 10 µV |
| Bus Voltage Range | 0 V to 36 V |
| Supply Voltage Range | 2.7 V to 5.5 V |
| Supply Current | Typical 330 µA |
| Operating Temperature Range | -40°C to 125°C |
| I2C Addresses | Up to 16 programmable addresses |
| Package Type | 10-pin DGS (VSSOP) |
Key Features
- High-Side or Low-Side Sensing: The INA226 can measure current on both high-side and low-side configurations.
- High Accuracy: Offers a maximum gain error of 0.1% and an offset voltage of 10 µV.
- Configurable Averaging Options: Allows for programmable conversion times and averaging modes to enhance measurement accuracy.
- Programmable Calibration: Enables direct readouts of current in amperes and power in watts through programmable calibration values and internal multipliers.
- I2C Interface: Supports up to 16 programmable addresses on the I2C-compatible interface.
- Operating Modes: Includes triggered, continuous, and power-down modes for flexible operation.
Applications
- Rack Servers: Ideal for monitoring power consumption in server environments.
- Wireless Infrastructure: Used in wireless base stations and other communication equipment.
- High Performance Computing: Suitable for monitoring power in high-performance computing systems.
- Power Management: Essential in power management systems for accurate current and voltage monitoring.
- Battery Cell Monitors and Balancers: Used in battery management systems to monitor and balance cell voltages.
- Power Supplies: Integrated into power supply units for real-time monitoring of current and voltage.
- Test Equipment: Utilized in various test and measurement devices for precise current and voltage measurements.
Q & A
- What is the primary function of the INA226?
The INA226 is a current shunt and power monitor that measures both shunt voltage drops and bus supply voltages, providing readings of current, voltage, and power.
- What is the operating voltage range of the INA226?
The INA226 operates from a single 2.7V to 5.5V power supply.
- What is the maximum gain error of the INA226?
The maximum gain error of the INA226 is 0.1%.
- Can the INA226 be used for both high-side and low-side sensing?
- How many programmable I2C addresses does the INA226 support?
The INA226 supports up to 16 programmable I2C addresses.
- What are the operating modes of the INA226?
The INA226 has triggered, continuous, and power-down operating modes.
- What is the typical supply current of the INA226?
The typical supply current of the INA226 is 330 µA.
- What is the operating temperature range of the INA226?
The operating temperature range of the INA226 is -40°C to 125°C.
- Can the INA226EVM be used to measure current up to 10 amps?
- What type of package does the INA226 come in?
The INA226 comes in a 10-pin DGS (VSSOP) package.
