INA229 datasheet(35/48 Pages) TI

35 / 48 page

<100

IN+

IN-

VBUS

GND

100 nF

VS = 2.7V± 5.5V

Load

Supply

CFILTER

0.1µF to 1µF

RFILTER

RDIFF

RSHUNT

Figure 8-1. Input Filtering

Do not use values greater than 100 ohms for RFILTER. Doing so will degrade gain error and increase non-

linearity.

8.2 Typical Application

The low offset voltage and low input bias current of the INA229-Q1 allow accurate monitoring of a wide range

of currents. To accurately monitor currents with high resolution, select the value of the shunt resistor so that the

resulting sense voltage is close to the maximum allowable differential input voltage range (either ±163.84 mV

or ±40.96 mV, depending on register settings). The circuit for monitoring currents in a high-side configuration is

shown in Figure 8-2.

IN+

IN-

VBUS

SCLK

MOSI

MISO

ALERT

GND

SHUNT

48 V

BATT

GND

10 k

100 nF

SPI

I/F

LOAD

CHARGER

S = 2.7 V to 5.5 V

MCU

Figure 8-2. INA229-Q1 High-Side Sensing Application Diagram

8.2.1 Design Requirements

The INA229-Q1 measures the voltage developed across a current-sensing resistor (RSHUNT) when current

passes through it. The device also measures the bus supply voltage and calculates power when calibrated. It

also comes with alert capability, where the alert pin can be programmed to respond to a user-defined event or a

conversion ready notification.

The design requirements for the circuit shown in Figure 8-2 are listed in Table 8-3.

Table 8-3. Design Parameters

DESIGN PARAMETER

EXAMPLE VALUE

Power-supply voltage (VS)

5 V

Bus supply rail (VCM)

48 V

Bus supply rail over voltage fault threshold

52 V

Average Current

6 A

Overcurrent fault threshold (IMAX)

10 A

www.ti.com

INA229-Q1

SLYS024A – MAY 2020 – REVISED JUNE 2021

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