Power Monitor. INA231 Datasheet


INA231 Datasheet PDF


Part Number

INA231

Description

Bidirectional Current and Power Monitor

Manufacture

etcTI

Total Page 30 Pages
Datasheet
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INA231
SBOS644C – FEBRUARY 2013 – REVISED MARCH 2018
INA231 High- or Low-Side Measurement, Bidirectional Current and Power Monitor
With 1.8-V I2C Interface
1 Features
1 Bus Voltage Sensing From 0 V to 28 V
• High- or Low-Side Sensing
• Current, Voltage, and Power Reporting
• High Accuracy:
– 0.5% Gain Error (Max)
– 50-μV Offset (Max)
• Configurable Averaging Options
• Programmable Alert Threshold
• 1.8-V I2C Compliant
• Power-Supply Operation: 2.7 V to 5.5 V
• Start-Up Mode Options:
– INA231A: Active Conversion
– INA231B: Low-Current Power Down
2 Applications
• Smartphones
• Tablets
• Servers
• Computers
• Power Management
• Battery Chargers
• Power Supplies
• Test Equipment
3 Description
The INA231 is a current-shunt and power monitor
with a 1.8-V compliant I2C interface that features 16
programmable addresses. The INA231 monitors both
shunt voltage drops and bus supply voltage, providing
increased protection by asserting the ALERT pin if
the values are outside the programmed range.
Programmable calibration value, conversion time, and
averaging, combined with an internal multiplier,
enable direct readouts of current in amperes and
power in watts, thus reducing host processing.
The INA231 senses current on bus voltages that vary
from 0 V to 28 V, with the device powered from a
single 2.7-V to 5.5-V supply, drawing 330 μA (typical)
of supply current. The INA231 is specified over the
operating temperature range of –40°C to +125°C.
The INA231 is available in two versions: the INA231A
starts up performing continuous conversions of the
shunt and bus voltage, whereas the INA231B starts
up in low-current, power-down mode.
Device Information(1)
PART NUMBER
PACKAGE
BODY SIZE (NOM)
INA231A
YFF (DSBGA-12)
YFD (DSBGA-12)
1.65 mm x 1.39 mm
x 0.62 mm
1.65 mm x 1.39 mm
x 0.40 mm
INA231B
YFD (DSBGA-12)
1.65 mm x 1.39 mm
x 0.40 mm
(1) For all available packages, see the package option addendum
at the end of the datasheet.
Power Supply
(0 V to 28 V)
High-or Low-Side Sensing
CBYPASS
0.1 mF
High-
Side
Shunt
Load
Low-
Side
Shunt
BUS
INA231
V
I
ADC
´ Power Register
Current Register
Voltage Register
Alert Register
VS
(Supply Voltage)
SDA
SCL
2
IC
Interface
ALERT
A0
A1
GND
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.

INA231
INA231
SBOS644C – FEBRUARY 2013 – REVISED MARCH 2018
www.ti.com
Table of Contents
1 Features .................................................................. 1
2 Applications ........................................................... 1
3 Description ............................................................. 1
4 Revision History..................................................... 2
5 Device Comparison Table..................................... 3
6 Pin Configuration and Functions ......................... 3
7 Specifications......................................................... 4
7.1 Absolute Maximum Ratings ...................................... 4
7.2 ESD Ratings.............................................................. 4
7.3 Recommended Operating Conditions....................... 4
7.4 Thermal Information .................................................. 4
7.5 Electrical Characteristics .......................................... 5
7.6 Timing Requirements: I2C Bus.................................. 6
7.7 Typical Characteristics .............................................. 7
8 Detailed Description ............................................ 10
8.1 Overview ................................................................. 10
8.2 Functional Block Diagram ....................................... 10
8.3 Feature Description................................................. 10
8.4 Device Functional Modes........................................ 14
8.5 Programming .......................................................... 15
8.6 Register Maps ......................................................... 22
9 Application and Implementation ........................ 28
9.1 Application Information............................................ 28
9.2 Typical Applications ................................................ 30
10 Power Supply Recommendations ..................... 32
11 Layout................................................................... 32
11.1 Layout Guidelines ................................................. 32
11.2 Layout Example .................................................... 32
12 Device and Documentation Support ................. 33
12.1 Documentation Support ........................................ 33
12.2 Receiving Notification of Documentation Updates 33
12.3 Community Resources.......................................... 33
12.4 Trademarks ........................................................... 33
12.5 Electrostatic Discharge Caution ............................ 33
12.6 Glossary ................................................................ 33
13 Mechanical, Packaging, and Orderable
Information ........................................................... 33
4 Revision History
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
Changes from Revision B (August 2017) to Revision C
Page
• Added B version device and associated content .................................................................................................................. 1
Changes from Revision A (June 2017) to Revision B
Page
• Changed NC pin description from "No internal connection" to "Do not connect, leave floating" .......................................... 3
• Changed SCL max value from VS + 0.3 V to 6 V in Absolute Maximum Ratings table ......................................................... 4
• Added text to end of Layout Guidelines section clarifying no connection of NC pins .......................................................... 32
Changes from Original (February 2013) to Revision A
Page
• Added Device Information, Recommended Operating Conditions, and ESD Ratings tables, and Detailed
Description , Application and Implementation, Power Supply Recommendations, Layout, Device and Documentation
Support , and Mechanical, Packaging, and Orderable Information sections ......................................................................... 1
• Added new WSCP-12 (YFD) package with 0.4-mm package height and associated content to data sheet......................... 1
• Added operating ambient temperature, TA to Absolute Maximum Ratings table ................................................................... 4
• Added new note 1 to Timing Requirements: I2C Bus section ............................................................................................... 6
• Added test condition to Figure 2 ............................................................................................................................................ 7
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