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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
HighSide Shunt
Load
LowSide 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
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 .........................