INA226 CJMCU-226 Current Shunt & Power Monitor Module

The INA226 is a precision current shunt and power monitor with an I²C/SMBus-compatible interface. It monitors both shunt voltage drop and bus supply voltage, enabling direct readouts of current in amperes and power in watts — making it ideal for embedded power management, battery monitoring, and test equipment applications.

Key Features

• Senses bus voltages from 0 V to 36 V (high-side or low-side sensing)
• Reports current, voltage, and power directly
• High accuracy: 0.1% gain error (max), 10 μV offset (max)
• Configurable averaging options for noise reduction
• 16 programmable I²C addresses — connect multiple modules on one bus
• Operates from a single 2.7 V to 5.5 V supply (~330 μA typical)
• Wide operating temperature: –40°C to +125°C
• Compact 10-pin VSSOP (DGS) package on breakout board

Pin Description

• IN+ / IN–: Non-inverting and inverting analog inputs (connect across shunt resistor)
• VBUS: Bus voltage input
• SDA / SCL: I²C data and clock lines
• ALERT: Multi-function programmable alarm output
• A0 / A1: I²C address selection pins
• GND / VCC: Power supply pins

Applications

• Power management & battery chargers
• Servers & telecom equipment
• Computing & embedded systems
• Power supply monitoring & test equipment