INA220BIDGSR Datasheet, PDF (1/39 Pages) Texas Instruments – High or Low Side, Bi-Directional CURRENT/POWER MONITOR with Two-Wire Interface

INA220
www.ti.com
SBOS459D – JUNE 2009 – REVISED SEPTEMBER 2010
High or Low Side, Bi-Directional
CURRENT/POWER MONITOR with Two-Wire Interface
Check for Samples: INA220
FEATURES
1
•2 HIGH- or LOW-SIDE SENSING
• SENSES BUS VOLTAGES FROM 0V TO +26V
• REPORTS CURRENT, VOLTAGE, AND POWER
• 16 PROGRAMMABLE ADDRESSES
• HIGH ACCURACY: 0.5% (Max) OVER
TEMPERATURE (INA220B)
• USER-PROGRAMMABLE CALIBRATION
• FAST (3.4MHz) TWO-WIRE MODE
• MSOP-10 PACKAGE
APPLICATIONS
• SERVERS
• TELECOM EQUIPMENT
• NOTEBOOK COMPUTERS
• POWER MANAGEMENT
• BATTERY CHARGERS
• AUTOMOTIVE
• POWER SUPPLIES
• TEST EQUIPMENT
DESCRIPTION
The INA220 is a current shunt and power monitor
with an Two-Wire 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
Two-Wire 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 0V to 26V, useful for low-side sensing or
CPU power supplies. The device uses a single +3V
to +5.5V supply, drawing a maximum of 1mA of
supply current. The INA220 operates from –40°C to
+125°C.
RELATED PRODUCTS
DESCRIPTION
DEVICE
Current/Power Monitor with Watchdog, Peak-Hold,
and Fast Comparator Functions
INA209
Zerø-Drift, Low-Cost, Analog Current Shunt Monitor
Series in Small Package
INA210, INA211,
INA212, INA213,
INA214
Zerø-Drift, Bi-Directional Current Power Monitor with
Two-Wire Interface
INA219
Supply (0 to 26V)
High-
Side
Shunt
Bus Voltage Input
Load
Low-
Side
Shunt
R2_F
R1_F C_F
V_IN+
V
I
V_IN-
GND
ADC
C_BYPASS
0.1mF
+3.3V to
+5V
´
Power Register
Current Register
Voltage Register
V_S (Supply Voltage)
INA220
Two-Wire
Interface
SDA
SCL
A0
A1
DATA
CLK
General Load, Low- or High-Side Sensing
1
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Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
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2
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.
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