INA700 datasheet(8/43 Pages) TI

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7 Detailed Description

7.1 Overview

The INA700 device is a digital current sense amplifier with an I2C digital interface. The device measures shunt

voltage, bus voltage, and internal temperature while calculating current, power, energy and charge necessary for

accurate decision making in precisely controlled systems. Programmable registers allow flexible configuration for

measurement precision as well as continuous or triggered operation. See the Register Maps for detailed register

information.

7.2 Functional Block Diagram

Power

Current

2C / SMBus

Interface

Bus Voltage

GND

16 – bit

ADC

ALERT

SDA

SCL

0.1 µF

Temperature

Supply Voltage

(2.7 V to 5.5 V)

Common-mode Voltage

(-0.3 V to 40 V)

Energy

TI Device

IN+

Charge

IN-

±0.5%

Oscillator

Alert_Diag

Shunt TC

Compensation

Registers

7.3 Feature Description

7.3.1 Integrated Shunt Resistor

The INA700 is a precise, low-drift, digital power monitor that provides accurate measurements over the entire

specified ambient temperature range of –40°C to +125°C. The integrated current-sensing resistor is internally

compensated to provide measurement stability over temperature, while simplifying printed circuit board (PCB)

layout and size constraints. Figure 7-1 shows the device gain error as a function of current.

Shunt Current (A)

-0.4

-0.2

0.2

0.4

0.6

0.8

1.2

1.4

Figure 7-1. Gain Error vs Shunt Current

INA700

SBOSAB4 – MAY 2023

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