INA3221 Current Sensor: Arduino, Datasheet, Applications

Product Overview

The INA3221 is a three-channel, high-side current and bus voltage monitor with an  I 2C  - and  SMBUScompatible  interface. The INA3221 monitors both shunt voltage drops  and bus supply voltages, in addition to having programmable conversion times and averaging modes for these signals. The INA3221 offers both critical and warning alerts to detect multiple programmable out-of-range conditions for each channel.

 

The INA3221 senses current on buses that can vary from 0 V to 26 V. The device is powered from a single 2.7-V to 5.5-V supply, and draws 350 μA (typ) of supply current. The INA3221 is specified over the operating temperature range  of –40°C to +125°C. The I2C- and SMBUS-compatible interface features four programmable addresses.

 

This blog will introduce INA3221 systematically from its features, pinout to its specifications, applications, also including INA3221 datasheet and so much more.

 

 

INA3221 Features

• Senses Bus Voltages From 0 V to 26 V
• Reports Shunt and Bus Voltage
• High Accuracy:

– Offset Voltage: ±80 µV (max)

– Gain Error: 0.25% (max)

• Configurable Averaging Options
• Four Programmable Addresses
• Programmable Alert and Warning Outputs
• Power-Supply Operation: 2.7 V to 5.5 V

 

INA3221 Pinout

The following figure is the diagram of INA3221 pinout.

 

INA3221 Pinout

 

INA3221 Applications

• Computers
• Power Management
• Telecom Equipment
• Battery Chargers
• Power Supplies
• Test Equipment

 

INA3221 Circuit Diagram

The following are the circuit diagrams of INA3221.

 

Power-Valid Output Structure

 

INA3221 With Input Filtering 

 

INA3221 as an Overcurrent Sensor 

 

INA3221 Functional Block Diagram

The following figure shows the block diagram of INA3221.

 

INA3221 Functional Block Diagram

INA3221 Package

The following diagram shows the INA3221 package.

 

INA3221 Package

 

INA3221 Specification

Common mode voltage (Max) (V)	26
Common mode voltage (Min) (V)	0
Input offset (+/-) (Max) (uV)	80
Input offset drift (+/-) (Typ) (uV/C)	0.1
Gain (V/V)	1
Gain error (%)	0.25
Gain error drift (+/-) (Max) (ppm/°C)	50
CMRR (Min) (dB)	110
Bandwidth (kHz)	3.5
Supply voltage (Max) (V)	5.5
Supply voltage (Min) (V)	2.7
Iq (Max) (mA)	0.35
Digital interface	I2C, SMBus
Features	Alert Function, Bi-directional, Low-side Capable
Resolution (Bits)	13
Operating temperature range (C)	-40 to 125

 

INA3221 Manufacturer

Texas Instruments Incorporated (TI) is a global semiconductor design and manufacturing company that develops analog ICs and embedded processors. By employing the world's brightest minds, TI creates innovations that shape the future of technology. TI is helping more than 100,000 customers transform the future, today.

 

INA3221 Datasheet

You can download INA3221 datasheet from the link given below:

INA3221 Datasheet

 

Using Warnings

Note: Please check their parameters and pin configuration before replacing them in your circuit.

 

INA3221 FAQ

What does the INA3221 monitor?

Shunt voltage drops and bus supply voltages.

 

What does the INA3221 offer to detect multiple programmable out-of-range conditions for each channel?

Critical and warning alerts.

 

What is the operating temperature range of the INA3221?

–40°C to +125°C.

 

How many programmable addresses does the INA3221 have?

Four.

 

What is a voltage monitor?

Voltage monitoring relays can detect not only under-voltages and over-voltages, but also voltage-related issues such as phase imbalances, phase loss, and phase sequence. Voltage monitoring relays are designed for either single-phase or three-phase systems.