INA210 datasheet(39/50 Pages) TI2

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regardless of whether the device has power applied or not. Place the required power-supply bypass capacitors

as close as possible to the supply and ground terminals of the device to provide stability. A typical value for

this supply bypass capacitor is 0.1μF. Applications with noisy or high-impedance power supplies can require

additional decoupling capacitors to reject power-supply noise.

8.4 Layout

8.4.1 Layout Guidelines

Connect the input pins (IN+ and IN–) of all the used channels to the sensing resistor using a Kelvin connection

or a 4-wire connection. These connection techniques verify that only the current-sensing resistor impedance

is detected between the input pins. Poor routing of the current-sensing resistor commonly results in additional

resistance present between the input pins. Given the very low ohmic value of the current-sensing resistor,

any additional high-current carrying impedance causes significant measurement errors. Place the power-supply

bypass capacitor as close as possible to the supply and ground pins.

8.4.2 Layout Example

IN 3

IN+3

GND

IN+1

IN 1

Critical

2C- and SMBUS-

Compatible Interface

Via to Ground Plane

Via to Power Plane

Connect to

bus power-

supply rail

Connect

to VPU

Supply

Bypass

Capacitor

Warning Output

To Bus Power Supply

To Load

To Bus Power

Supply

To Load

Critical

Output

Timing Control Output

Figure 8-4. Layout Example

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INA3221

SBOS576C – MAY 2012 – REVISED SEPTEMBER 2025

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