1 Features

• Senses bus voltages from 0V to 26V

• Reports shunt and bus voltage

• High accuracy:

– Offset voltage: ±80μV (maximum)

– Gain error: 0.25% (maximum)

• Configurable averaging options

• Four programmable addresses

• Programmable alert and warning outputs

• Power-supply operation: 2.7V to 5.5V

2 Applications

• Computers

• Power management

• Telecom equipment

• Battery chargers

• Power supplies

• Test equipment

• Data Centers

3 Description

The INA3221 is a three-channel, high-side current

and bus voltage monitor with an I2C- and SMBUScompatible

interface. The INA3221 monitors both

shunt voltage drops and bus supply voltages, in

addition to having programmable conversion times

and averaging modes for these signals. The INA3221

offers both critical and warning alerts to detect

multiple programmable out-of-range conditions for

each channel.

The INA3221 senses current on buses that can vary

from 0V to 26V. The device is powered from a

single 2.7V to 5.5V supply, and draws 350μA (typ)

of supply current. The INA3221 is specified over the

operating temperature range of –40°C to +125°C. The

I2C- and SMBUS-compatible interface features four

programmable addresses.