INA3221
- 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
The INA3221 is a three-channel, high-side current and bus voltage monitor with an I2C- and SMBUS-compatible 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.
Technical documentation
Type | Title | Date | ||
---|---|---|---|---|
* | Data sheet | INA3221 Triple-Channel, High-Side Measurement, Shunt and Bus Voltage Monitor with I2C- and SMBUS-Compatible Interface datasheet (Rev. B) | PDF | HTML | 22 Mar 2016 |
Application brief | Current Sensing Applications in Communication Infrastructure Equipment (Rev. C) | PDF | HTML | 08 Aug 2023 | |
E-book | An Engineer's Guide to Current Sensing (Rev. B) | 12 Apr 2022 | ||
Application note | Using a PCB Copper Trace as a Current-Sense Shunt Resistor | PDF | HTML | 25 Jan 2022 | |
Application note | Digital Interfaces for Current Sensing Devices (Rev. A) | PDF | HTML | 30 Sep 2021 | |
Selection guide | Current Sense Amplifiers (Rev. E) | 20 Sep 2021 | ||
Application note | Getting Started with Digital Power Monitors (Rev. A) | PDF | HTML | 02 Sep 2021 | |
Application brief | Energy and Power Monitoring with Digital Current Sensors | 25 May 2017 | ||
Application note | Understanding the I2C Bus | PDF | HTML | 30 Jun 2015 | |
EVM User's guide | INA3221EVM Evaluation Board and Software Tutorial | 23 Apr 2012 |
Design & development
For additional terms or required resources, click any title below to view the detail page where available.
INA3221EVM — INA3221 Evaluation Module
The INA3221EVM is a platform for evaluating the performance of the INA3221 under various signal, shunt, and supply conditions.
INA3221SW-LINUX — Linux Driver for INA3221
Linux Mainline Status
Available in Linux Main line: Yes
Available through git.ti.com: N/A
- ina3221
SBOC425 — INA3221EVM User Software
Supported products & hardware
Products
Digital power monitors
Hardware development
Evaluation board
ANALOG-ENGINEER-CALC — PC software analog engineer's calculator
The analog engineer’s calculator is designed to speed up many of the repetitive calculations that analog circuit design engineers use on a regular basis. This PC-based tool provides a graphical interface with a list of various common calculations ranging from setting operational-amplifier (...)
Supported products & hardware
Products
Precision op amps (Vos<1mV)
General-purpose op amps
Audio op amps
Transimpedance amplifiers
High-speed op amps (GBW ≥ 50 MHz)
Power op amps
Video amplifiers
Line drivers
Transconductance amplifiers & laser drivers
Fully differential amplifiers
Precision ADCs
Biosensing AFEs
High-speed ADCs (≥10 MSPS)
Receivers
Touchscreen controllers
Difference amplifiers
Instrumentation amplifiers
Audio line receivers
Analog current-sense amplifiers
Digital power monitors
Analog current-sense amplifiers with integrated shunt resistor
Digital power monitors with integrated shunt resistor
Die & wafer services
CS-AMPLIFIER-ERROR-TOOL — Current Sense Amplifier Comparison and Error Tool
Supported products & hardware
Products
Analog current-sense amplifiers
Digital power monitors
SBOR021 — Power Monitor Tool
Supported products & hardware
Products
Digital power monitors
Digital power monitors with integrated shunt resistor
PSPICE-FOR-TI — PSpice® for TI design and simulation tool
TINA-TI — SPICE-based analog simulation program
TIDA-050034 — Integrated power supply reference design for NXP i.MX 7D processor
The hardware design consists of DDR3L SDRAM (2x512MB), 64MB Serial NOR Flash, 8GB eMMC 5.0 iNAND, SD Card interface v3.0, 50 pin LCD Connector for external TFT display (...)
TIDA-050038 — Integrated power supply reference design for NXP i.MX 8M mini processor
TIDA-050043 — Integrated power supply reference design for NXP i.MX 6ULL processor
Package | Pins | CAD symbols, footprints & 3D models |
---|---|---|
VQFN (RGV) | 16 | Ultra Librarian |
Ordering & quality
- RoHS
- REACH
- Device marking
- Lead finish/Ball material
- MSL rating/Peak reflow
- MTBF/FIT estimates
- Material content
- Qualification summary
- Ongoing reliability monitoring
- Fab location
- Assembly location
Support & training
TI E2E™ forums with technical support from TI engineers
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