INA231
www.ti.com
SBOS644 –FEBRUARY 2013
High- or Low-Side Measurement,
Bidirectional CURRENT/POWER MONITOR with 1.8-V I2C™ Interface
Check for Samples: INA231
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FEATURES
DESCRIPTION
The INA231 is a current-shunt and power monitor
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Bus Voltage Sensing From 0 V to +28 V
with a 1.8-V compliant I2C interface that features 16
programmable addresses. The INA231 monitors both
shunt voltage drops and bus supply voltage.
Programmable calibration value, conversion times,
and averaging combined with an internal multiplier
enable direct readouts of current in amperes and
power in watts.
•
High- or Low-Side Sensing
Current, Voltage, and Power Reporting
High Accuracy:
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–
–
0.5% Gain Error (Max)
50-μV Offset (Max)
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Configurable Averaging Options
Programmable Alert Threshold
1.8-V I2C Compliant
The INA231 senses current on buses 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.
Power-Supply Operation: 2.7 V to 5.5 V
Package: 1.68-mm × 1.43-mm, WCSP-12
RELATED PRODUCTS
DESCRIPTION
APPLICATIONS
DEVICE
Current and power monitor with watchdog, peak-
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Smartphones
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Power Management
Battery Chargers
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High or Low-side, bidirectional current and power
monitor with two-wire interface and programmable
alert
HIGH-OR LOW-SIDE SENSING
Power Supply
(0 V to 28 V)
CBYPASS
0.1 mF
VS
BUS
High-
Side
Shunt
(Supply Voltage)
INA231
SDA
SCL
Power Register
Current Register
Voltage Register
Alert Register
´
Load
V
I
I2C
Interface
ADC
Low-
Side
Shunt
ALERT
A0
A1
GND
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Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
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I2C is a trademark of NXP Semiconductors.
All other trademarks are the property of their respective owners.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2013, Texas Instruments Incorporated