Boardoza INA3221 Three-Channel Current and Bus Voltage Monitor Breakout Board
Boardoza INA3221-BRK is a high-precision measurement module. It can monitor the current and bus voltage of up to 3 independent power lines at the same time on a single compact board. To get the best power resistance and thermal stability, the board uses 3mΩ special alloy shunt resistors. These resistors have a high accuracy of ±%2 and a power capacity of 4W. With this hardware, you can safely measure up to 36A per channel. When combined with the 40uV shunt voltage step of the INA3221 chip, it gives a minimum current resolution of exactly 13.33mA. Also, the 13-bit ADC structure of the module offers a bus voltage step of 8mV per bit for stable, bidirectional power tracking. The board communicates directly via an I2C interface. It is an ideal solution for Battery Management Systems (BMS), servers and industrial power panels.
Key Features
- Three Independent Channels: Ability to monitor the current and voltage of 3 different power lines at the same time through a single module without affecting each other.
- Wide Bus Voltage Range: Safe and stable operation on system lines between 0V and 26V.
- High-Precision ADC Resolution: Thanks to its internal 13-bit ADC, the bus voltage step per bit is reported as exactly 8mV.
- Ultra-Low Power Consumption: It typically draws only 350uA of current in active mode, and this value drops to 0.5uA in power-down (shutdown) mode.
- Flexible Sampling Frequency: The internal ADC takes a sample every 1.1ms by default; however, this duration can be adjusted programmatically between 140us and 8.244ms based on your needs.
- Hardware Alert Outputs: It instantly warns external hardware or microcontrollers with a *Critical Alert* pin for sudden overcurrent conditions and a *Warning Alert* pin for average current tracking. I2C Address Selection You can change the hardware I2C address of the module by using the solder bridges (SDA, SCL, GND) in the ADDRESS SELECT area located at the bottom left corner of the board (The default address is 0x40):
- A0 -\> Connected to GND: 0x40 (Default)
- A0 -\> Connected to VS (Power Supply): 0x41
- A0 -\> Connected to SDA line: 0x42
- A0 -\> Connected to SCL line: 0x43
Technical Specifications
- Item
- INA3221
- Logic Supply Voltage (VS)
- 2.7V to 5.5V
- Monitored Bus Voltage
- 0V to 26V
- Functions
- Triple-channel current and bus voltage monitoring
- Shunt Resistor
- 3mΩ (The current-sensing resistor on each channel)
- Max Shunt Current
- 36A for each three channel
- Communication Interface
- I2C
- ADC Resolution
- 13-Bit
- Operating Temperature
- –40°C to +125°C
- Board Dimensions
- 80x60mm
Support
For technical questions, documentation and issue reports, use the GitHub repository or write to us directly.