R

SHUNT

Attenuator

Load

Two-Wire

Interface

GND

INA223

C

BYPASS

0.1 F

m

V (Supply Voltage)

S

Power Supply

(0V to 26V)

R

4.7k

PULLUP

W

V

IN-

V

IN+

V

OUT

SCL

SDA

A0

INA223

www.ti.com

SBOS528 – JUNE 2012

APPLICATION INFORMATION

The INA223 is an analog output current shunt monitor that incorporates an analog multiplier to provide

instantaneous power measurement. The INA223 features a two-wire and SMBus-compatible interface allowing

the configuration settings of the device to be adjusted and changed as needed, based on the specific application

requirements. The configuration options include the selection of the desired signal to be available at the output

pin, switching between multiple current shunt voltage gains and bus voltage attenuation factors, as well as being

able to place the device into a disabled state.

INA223 TYPICAL APPLICATION

as close as possible to the shunt resistor to minimize any resistance in series with the shunt resistance. A power-

supply bypass capacitor is required for stability. Use a 0.1-

μF ceramic capacitor for supply bypassing, placed as

close as possible between the supply and ground pins.

Figure 33. Typical Application

BASIC FUNCTIONS

The INA223 can be configured to monitor and report the differential voltage developed across a shunt resistor,

the power supply bus voltage, or the power being delivered to the load. Through the two-wire interface, the

output multiplexer (mux) can be configured to provide a proportional output signal to any one of these input

signals at the output pin, VOUT. The digital interface can also be used to switch between different current shunt

voltage gains, bus voltage attenuation settings, as well as place the device into a disabled mode. The multiple

settings available for the current shunt voltage gains and bus voltage attenuation factors allow the INA223 to

operate over a wider input signal range than a single fixed-setting device would allow.

Copyright © 2012, Texas Instruments Incorporated

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Product Folder Link(s): INA223