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