Description

INA3221 is a three-channel, high-side current and bus voltage monitor with an I2C- and SMBUS-compatible interface.

Key Specifications & Features

• Bus Voltage Range: 0V to 26V per channel

• Supply Voltage (VDD): 2.7V to 5.5V

• Current Sensing: Measures shunt voltage drop (typically using 0.1Ω resistors by default) to calculate current and power

• High Accuracy: ±80µV maximum offset voltage and 0.25% maximum gain error

• I2C Addresses: Four programmable addresses (0x40, 0x41, 0x44, 0x45) via address pins or jumpers

• Alerts: Programmable critical and warning alert pins for bus/shunt voltages

Common Use Cases

• Multi-rail power monitoring in embedded systems and industrial equipment.

• Battery pack monitoring (such as tracking individual cells in multi-cell Li-ion or LiPo setups).

• Smart home and IoT integrations using platforms like ESPHome or Arduino.