Time (500 µs/div)

VOUT

VREF

C002

0V

-

Reference

Voltage

0.1µF

Output

-

+

IN-

IN+

GND

V+

OUT

REF

Power Supply

Bus Supply

Load

23

INA210, INA211, INA212, INA213, INA214, INA215

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SBOS437I – MAY 2008 – REVISED SEPTEMBER 2016

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Typical Applications (continued)

9.2.2 Bidirectional Operation

Figure 32. Bidirectional Application Schematic

9.2.2.1 Design Requirements

The device is a bidirectional, current-sense amplifier capable of measuring currents through a resistive shunt in

two directions. This bidirectional monitoring is common in applications that include charging and discharging

operations where the current flow-through resistor can change directions.

9.2.2.2 Detailed Design Procedure

The ability to measure this current flowing in both directions is enabled by applying a voltage to the REF pin, as

than mid-scale when the bidirectional current and corresponding output signal do not need to be symmetrical.

9.2.2.3 Application Curve

An example output response of a bidirectional configuration is shown in Figure 33. With the REF pin connected

to a reference voltage, 2.5 V in this case, the output voltage is biased upwards by this reference level. The

output rises above the reference voltage for positive differential input signals and falls below the reference

voltage for negative differential input signals.

Figure 33. Bidirectional Application Output Response