Power

Supply

(0V to 26V)

Load 1

Load 2

Power

Supply

(0V to 26V)

Load 3

Power

Supply

(0V to 26V)

0.1µF

Voltage)

CH 1

CH 2

CH 3

I

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

10kΩ

VPU

10kΩ

INA3221

SBOS576 – MAY 2012

www.ti.com

APPLICATION INFORMATION

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

10

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Product Folder Link(s): INA3221