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.