INA745AIRELR datasheet(35/50 Pages) TI2

35 / 50 page

GND

ALERT

SDA

SCL

0.1µF

Power supply voltage

(2.7V to 5.5V)

Bus supply rail

(upto 40V)

IS+

TI Device

LOAD

SH+

IN+

VBUS

SH−

IN−

IS−

Figure 8-2. INA745x High-Side Sensing Application Diagram

8.2.1 Design Requirements

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)

Bus supply rail (VCM)

12V

Bus supply rail overvoltage fault threshold

16V

Average Current

18A

Overcurrent fault threshold (IMAX)

21A

Temperature

85°C

Charge Accumulation Period

15 minutes

8.2.2 Detailed Design Procedure

8.2.2.1 Configure the Device

The first step to program the INA745x is to properly set the device and ADC configuration registers. On initial

power up, the CONFIG and ADC_CONFIG registers are set to the reset values as shown in Table 7-3 and

Table 7-4. In this default power-on state the device is set with the ADC continuously converting the temperature,

current, and bus voltage. If the default power-up conditions do not meet the design requirements, these registers

must be set properly after each VS power cycle event.

8.2.2.2 Set Desired Fault Thresholds

Fault thresholds are set by programming the desired trip threshold into the corresponding fault register. Table 6-1

lists the supported fault registers.

www.ti.com

INA745A, INA745B

SBOSAC3B – JULY 2023 – REVISED AUGUST 2025

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