INA700 datasheet(35/50 Pages) TI

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8.2 Typical Application

The low offset voltage of the INA700 allows accurate monitoring of a wide range of currents. Figure 8-1 shows

the circuit for monitoring currents in a high-side configuration.

GND

ALERT

SDA

SCL

0.1 µF

Power supply voltage

(2.7 V to 5.5 V)

Bus supply rail

(-0.3 V to 40 V)

IN+

IN-

INA700

LOAD

Figure 8-1. INA700 High-Side Sensing Application Diagram

8.2.1 Design Requirements

The design requirements for the circuit shown in Figure 8-1 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)

12 V

Bus supply rail overvoltage fault threshold

14 V

Average Current

5 A

Overcurrent fault threshold (IMAX)

9 A

Temperature

40ºC

Charge Accumulation Period

1 hour

8.2.2 Detailed Design Procedure

8.2.2.1 Configure the Device

The first step to program the INA700 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 7-5 and

Table 7-6. 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 7-1

shows the list of supported fault registers.

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INA700

SBOSAB4A – MAY 2023 – REVISED SEPTEMBER 2023

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