Datasheet

Power
Supply
(0V to 26V)
Load 1
Load 2
Power
Supply
(0V to 26V)
Load 3
Power
Supply
(0V to 26V)
C
BYPASS
0.1µF
V
S
(Supply
Voltage)
CH 1
CH 2
V
IN-
1
V
IN+
1
V
IN-
2
V
IN+
2
CH 3
V
IN-
3V
IN+
3
I
2
C
Interface
SDA
SCL
A0
Critical
Warning
GND
ADC
Shunt
Voltages 1-3
Critical Limit
Alerts 1-3
Bus
Voltages 1-3
Power Valid
Timing Control
Shunt Voltage
Sum Alerts
V
S
V
PU
10kΩ
VPU
10kΩ
INA3221
SBOS576A –MAY 2012–REVISED JUNE 2013 www.ti.com
APPLICATION INFORMATION
The INA3221 is a current-shunt and bus voltage monitor that communicates over an I
2
C- and SMBus-compatible
interface. The device provides digital shunt and bus voltage readings necessary for accurate decision making in
precisely-controlled systems and also monitors multiple rails to ensure compliance voltages are maintained.
Programmable registers offer flexible configuration for measurement precision and continuous versus single-shot
operation. The Register Information section provides details of the INA3221 registers, beginning with Table 1.
See Figure 1 for a register block diagram of the INA3221.
INA3221 TYPICAL APPLICATION
Figure 20 illustrates a typical INA3221 application circuit. Use a 0.1-μF ceramic capacitor for power-supply
bypassing, placed as close as possible to the supply and ground pins.
Figure 20. Typical Application Diagram
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