INA220 Datasheet, PDF (1/36 Pages) Texas Instruments – High or Low Side, Bi-Directional CURRENT/POWER MONITOR with Two-Wire Interface

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INA220
SBOS459E – JUNE 2009 – REVISED JANUARY 2016
INA220 High- or Low-Side, Bidirectional Current and Power Monitor
With Two-Wire Interface
1 Features
•1 High- or Low-Side Sensing
• Senses Bus Voltages from 0 V to 26 V
• Reports Current, Voltage, and Power
• 16 Programmable Addresses
• High Accuracy: 0.5% (Maximum) Over
Temperature (INA220B)
• User-Programmable Calibration
• Fast (2.56-MHz) I²C- or SMBUS-Compatible
Interface
• VSSOP-10 Package
2 Applications
• Servers
• Telecom Equipment
• Notebook Computers
• Power Management
• Battery Chargers
• Automotive
• Power Supplies
• Test Equipment
3 Description
The INA220 is a current shunt and power monitor
with an I²C- or SMBUS-compatible interface. The
INA220 monitors both shunt drop and supply voltage.
A programmable calibration value, combined with an
internal multiplier, enables direct readouts in
amperes. An additional multiplying register calculates
power in watts. The I²C- or SMBUS-compatible
interface features 16 programmable addresses. The
separate shunt input on the INA220 allows it to be
used in systems with low-side sensing.
The INA220 is available in two grades: A and B. The
B grade version has higher accuracy and higher
precision specifications.
The INA220 senses across shunts on buses that can
vary from 0 to 26 V, useful for low-side sensing or
CPU power supplies. The device uses a single 3- to
5.5-V supply, drawing a maximum of 1 mA of supply
current. The INA220 operates from –40°C to 125°C.
Device Information⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (NOM)
INA220
VSSOP (10)
3.00 mm × 3.00 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Supply (0 to 26V)
General Load, Low- or High-Side Sensing
C_BYPASS
0.1µF
+3.3V to
+5V
High-
Side
Shunt
Load
Low-
Side
Shunt
Bus Voltage Input
R2_F
R1_F C_F
V_IN+
V
I
V_IN-
GND
ADC
×
Power Register
Current Register
Voltage Register
V_S (Supply Voltage)
INA220
I²C-/SMBUS-
Compatible
Interface
SDA
SCL
A0
A1
DATA
CLK
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.