Texas Instruments INA226 Contrôleur de courant/alimentation - Boîtier SOIC-8

High-Precision Current and Power Monitor with I2C Interface

Le INA226 is a high-side or low-side, bi-directional current and power monitor with an integrated 16-bit analog-to-digital converter (ADC) from Texas Instruments (TI). Designed for precision power measurement in industrial, automotive, and computing systems, this device offers digital output via an I2C-compatible interface. With its high accuracy, wide input range, and flexible configuration, it is ideal for applications requiring real-time monitoring of voltage, current, and power.

Technical Overview of the INA226 Power Monitor

The device measures the voltage across a shunt resistor to calculate current and power. It supports a wide common-mode voltage range and provides programmable calibration for system-specific optimization. The integrated 16-bit ADC ensures high-resolution measurements, while the I2C interface allows seamless integration into embedded systems.

Caractéristiques principales

• 16-bit ADC for high-resolution measurements
• Bi-directional current sensing
• Wide common-mode voltage range: 0 V to 36 V
• Étalonnage programmable pour une précision au niveau du système
• Alert function for over/under voltage, current, or power
• Low quiescent current: 330 µA (typical)
• I2C-compatible interface with up to 3.4 MHz communication speed

Spécifications techniques

Paramètres	Valeur
Supply Voltage (VCC)	2,7 V à 5,5 V
Common-Mode Input Voltage Range	0 V to 36 V
Tension de décalage d'entrée	±10 µV (typical)
Résolution ADC	16 bits
Plage de mesure du courant	±81.92 mV across shunt
Courant d'alimentation	330 µA (typical)
Interface	I2C (jusqu'à 3,4 MHz)
Plage de température de fonctionnement	-40°C à +125°C

Why Choose This Power Monitor Over Conventional Solutions?

Compared to traditional current sensing solutions, this device offers several avantages en termes de performances that make it a preferred choice for engineers and system designers:

• Haute précision : With a low input offset voltage and 16-bit resolution, it delivers precise current and power measurements, even at low currents.
• Large gamme de tensions : The ability to monitor systems with common-mode voltages up to 36 V makes it suitable for a broad range of applications, from battery-powered devices to industrial equipment.
• Digital Output: Unlike analog current sensors, this device provides digital data over I2C, reducing noise susceptibility and simplifying system integration.
• Programmable Calibration: Enables system-level optimization for different shunt resistor values and expected current ranges, improving measurement accuracy.
• Integrated Alert Function: Built-in alert pin can be configured to trigger on user-defined thresholds, enabling real-time system protection and diagnostics.

These features make it a superior alternative to discrete analog solutions or lower-resolution digital monitors, especially in applications where accuracy, flexibility, and digital communication are critical.

Typical Applications in Industrial and Automotive Systems

This power monitor is widely used in various sectors due to its robust performance and flexible configuration. Common applications include:

• Server and Telecom Power Management: Real-time monitoring of power consumption in high-density computing environments.
• Battery Management Systems (BMS): Accurate current and voltage monitoring for lithium-ion battery packs in electric vehicles and energy storage systems.
• Automatisation industrielle : Monitoring motor drives, PLCs, and control systems for predictive maintenance and energy efficiency.
• Électronique grand public : Power monitoring in laptops, tablets, and other portable devices to optimize battery life and thermal performance.
• Solar Inverters and Power Supplies: Ensures safe and efficient operation by tracking input/output power levels.

Texas Instruments: A Trusted Name in Precision Analog Technology

Texas Instruments (TI) is a global leader in analog and embedded processing semiconductors. Known for its innovation and reliability, TI provides high-performance components that meet the rigorous demands of industrial, automotive, and consumer applications. The company’s commitment to quality and support makes it a preferred supplier for engineers worldwide.

The INA226 is part of TI’s extensive portfolio of power monitoring solutions, reflecting the company’s expertise in delivering accurate, efficient, and scalable analog products.

Foire aux questions (FAQ)

1. Quelle est la tension maximale que l'appareil peut surveiller ?

The device supports a common-mode input voltage range from 0 V to 36 V, making it suitable for both low-voltage and high-voltage system monitoring applications.

2. Can this device measure both current and power?

Yes, it measures the voltage across a shunt resistor to calculate current and uses this data along with bus voltage to compute real-time power consumption digitally.

3. Is the I2C interface compatible with standard microcontrollers?

Yes, the I2C interface is compatible with most microcontrollers and supports communication speeds up to 3.4 MHz, allowing fast data transfer in embedded systems.

4. How does the alert function work?

The alert function can be configured to trigger when user-defined thresholds for voltage, current, or power are exceeded, enabling proactive system protection and diagnostics.

5. What makes this device more accurate