INA700 datasheet(12/50 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 +105°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 7-2 shows the device gain error as a function of current.

The IN+ and IN– pins allow access to the on-chip current-sensing resistor. This resistor features internal sense

connections that are factory-calibrated and temperature-compensated to achieve a high level of accuracy. The

INA700 is system-calibrated so that the current-sensing resistor and current-sensing amplifier are both precisely

matched to one another.

The nominal pin-to-pin resistance from IN+ to IN– is approximately 3.6 mΩ, while the internal resistance seen by

the digital power monitor is nominally 2 mΩ. The power dissipation requirements of the system and package are

based on the total package resistance between the IN+ and IN– pins. The material composition of the internal

shunt has a resistance that increases with temperature as shown in Figure 7-1.

INA700

SBOSAB4A – MAY 2023 – REVISED SEPTEMBER 2023

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