MCU-3221 INA3221 Three Way I2C Output Current Power Monitor

MCU-3221 INA3221 Three Way I2C Output Current Power Monitor is a sophisticated module that utilizes the Texas Instruments INA3221, a triple-channel, high-side current and voltage monitor with an I²C interface. This module enables the simultaneous measurement of bus voltage, shunt voltage, and calculated power for up to three different power rails or components. Consequently, you can accurately track and manage power consumption across multiple subsystems in real-time. The INA3221 boasts high accuracy and features a programmable averaging mode and continuous conversion mode, making it exceptionally reliable for monitoring dynamic loads. Therefore, engineers integrate this compact, highly capable module into power-sensitive devices that require precise load management and protective overcurrent monitoring.

Key Features:

• Triple Channel Monitoring: Simultaneously measures current and bus voltage for three independent power rails, providing comprehensive system visibility.
• High-Side Sensing: The device performs current measurement on the high side, which maintains the ground path integrity and simplifies circuitry.
• Integrated Calculations: The IC calculates and stores the power consumption (Current × Voltage) internally, simplifying the host microcontroller’s processing load.
• I²C Digital Interface: Uses the standard I²C communication protocol, which allows for easy configuration and digital data retrieval with just two wires (SDA and SCL).
• Programmable Alert Function: Features configurable alert thresholds for current, bus voltage, and power, enabling automatic system protection mechanisms.

Technical Specifications:

• Number of Channels: 3
• Bus Voltage Range (V_BUS): 0 V to +26 V
• Shunt Voltage Range (V_SHUNT): ±160 mV
• Current Measurement Accuracy: Typically ±0.5% (Full Scale)
• Interface Protocol: I²C-Compatible Digital Output (up to 400 kHz)
• Input Supply Voltage (V_DD): 2.7 V to 5.5 V
• Quiescent Current: ≈ 2 mA
• Fixed I²C Address: Four programmable I²C addresses are available via the hardware pins.

Mechanical Specifications:

• Component IC: Texas Instruments INA3221
• Shunt Resistors: Typically 0.1 Ω (100 mΩ), 2W or 3W power resistors (check specific module).
• Module Connectors: Screw terminals for connecting power rails and pin headers for I²C and power supply.

Dimensions:

• Module Board Size: ≈ 38 mm x 32 mm
• Mounting Holes: Four standard mounting holes for secure installation.
• Weight: ≈ 8 g (Modular and lightweight)

Pinout and Wiring:

• VCC/VDD: Connect to the module’s supply voltage (typically 3.3 V or 5 V).
• GND: Connect to the common ground of the system.
• SDA (Data) & SCL (Clock): Connect to the host microcontroller’s I²C data and clock lines, respectively.
• CH1, CH2, CH3 (Load/Power Inputs): Connect the three power rails you wish to monitor. Each channel has two terminals (IN+ and IN−) for connecting the shunt resistor in series with the load.
• ALERT: Digital output pin that signals if a programmable alert threshold is exceeded.
• ADDR (Optional): Address selection pin (often tied to GND or VCC on the module for a fixed address; check specific board documentation for the four possible addresses).

Datasheet Reference:

• Download INA3221 Triple-Channel Current and Power Monitor Datasheet

Commonly Used in:

• Battery Management Systems (BMS): Essential for monitoring the charge/discharge currents of multiple battery cells or rails.
• Server and Telecom Equipment: Used for precise power budgeting and hot-swap circuit protection.
• Power Over Ethernet (PoE) Devices: Enabling accurate power consumption tracking on both the data and power lines.

Applications:

• Energy Harvesting Systems: Optimizing power usage and tracking input/output energy flows.
• Multi-Channel Motor/LED Control: Monitoring the individual power draw of motors or high-power LED arrays.
• System Health Monitoring: Providing telemetry data for predictive maintenance and fault detection in embedded systems.
• Load Profiling: Characterizing the power signature of a device during different operational modes.

Equivalent Models:

• INA226 (TI): A high-accuracy, single-channel power monitor IC with similar features, however, it lacks the multi-channel capability of the INA3221.
• MAX44284 (Maxim Integrated): A quad-channel current sense amplifier, furthermore, it often requires external components to calculate power digitally.
• LTC2990 (Analog Devices): A quad I²C voltage, current, and temperature monitor, offering a different combination of monitoring capabilities.

Package Includes:

• 1 x MCU-3221 INA3221 Three Way I2C Output Current Power Monitor Module