INA231AIYFDR datasheet(32/44 Pages) TI1

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ALERT

SDA

SCL

GND

IN+

IN-

BUS

CBYPASS

Connect to supply for VS

VIA to GND

VIA to another layer

2C/SMBUS

interface

Alert output

(Can be left floating

if unused)

Tie to GND, VS,

SCL, or SDA to set

2C address

INA231

SBOS644B – FEBRUARY 2013 – REVISED AUGUST 2017

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Product Folder Links: INA231

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10 Power Supply Recommendations

The INA231 input circuitry accurately measures signals on common-mode voltages beyond the device power-

supply voltage, VS. For example, the voltage applied to the power-supply pin (VS) can be 5 V; however, the load

power-supply voltage being monitored (the common-mode voltage) can be as high as 28 V. The device can also

withstand the full 0-V to 28-V range at the input terminals, 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 pins of the

device. A typical value for this supply bypass capacitor is 0.1 μF. For more accurate results for applications with

noisy or high-impedance power supplies, use additional decoupling capacitors to reject power-supply noise.

11 Layout

11.1 Layout Guidelines

Connect the input pins (IN+ and IN–) to the sensing resistor using a Kelvin or 4-wire connection. These

connection techniques make sure 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. Make sure the NC pins (B2 and C2) are not connected to anything.

11.2 Layout Example

Figure 32. Layout Example

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