INA3221_17 Datasheet, PDF (1/46 Pages) Texas Instruments – Triple-Channel, High-Side Measurement, Shunt and Bus Voltage Monitor with I2C- and SMBUS-Compatible Interface

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INA3221
SBOS576B – MAY 2012 – REVISED MARCH 2016
INA3221 Triple-Channel, High-Side Measurement,
Shunt and Bus Voltage Monitor with I²C- and SMBUS-Compatible Interface
1 Features
•1 Senses Bus Voltages From 0 V to 26 V
• Reports Shunt and Bus Voltage
• High Accuracy:
– Offset Voltage: ±80 µV (max)
– Gain Error: 0.25% (max)
• Configurable Averaging Options
• Four Programmable Addresses
• Programmable Alert and Warning Outputs
• Power-Supply Operation: 2.7 V to 5.5 V
2 Applications
• Computers
• Power Management
• Telecom Equipment
• Battery Chargers
• Power Supplies
• Test Equipment
3 Description
The INA3221 is a three-channel, high-side current
and bus voltage monitor with an I²C- and SMBUS-
compatible 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 0 V to 26 V. The device is powered from a
single 2.7-V to 5.5-V supply, and draws 350 μA (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.
Device Information⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (NOM)
INA3221
VQFN (16)
4.00 mm x 4.00 mm
(1) For all available packages, see the package option addendum
at the end of the datasheet.
Power Supply
(0 V to 26 V)
Typical Application
Load 1
CBYPASS
0.1 µF
Power Supply
(0 V to 26 V)
VIN+2
VIN±2
VIN+1
CH 2
Load 2
Power Supply
(0 V to 26 V)
VIN+3
VIN±1
CH 1
ADC
CH 3
Bus
Voltages 1-3
Shunt
Voltages 1-3
Critical Limit
Alerts 1-3
Shunt Voltage
Sum Alerts
VIN±3
GND
VS (Supply
Voltage)
SDA
I²C-
and
SCL
SMBus-
Compatible A0
Interface
VPU
VPU
Power Valid (PV)
Critical
Warning
Timing Control (TC)
Load 3
10 k
VS
10 k
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.