INA231AIYFFR 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

SBOS644A – FEBRUARY 2013 – REVISED JUNE 2017

www.ti.com

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.

11.2 Layout Example

Figure 32. Layout Example

INA231AIYFFR Datasheet(PDF) 32 Page - Texas Instruments

INA231AIYFFR Datasheet(HTML) 32 Page - Texas Instruments

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