INA220 Datasheet, PDF (1/35 Pages) Texas Instruments – High or Low Side, Bi-Directional CURRENT/POWER MONITOR with Two-Wire Interface

INA220
www.ti.com ............................................................................................................................................................. SBOS459B – JUNE 2009 – REVISED JUNE 2009
High or Low Side, Bi-Directional
CURRENT/POWER MONITOR
with Two-Wire Interface
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: 1% (Max) OVER
TEMPERATURE
• 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
Supply (0 to 26V)
High-
Side
Shunt
Bus Voltage Input
Load
Low-
Side
Shunt
R2_F
R1_F C_F
V_IN+
V
V_IN-
I
GND
´
ADC
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 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
Current/Power Monitor with Watchdog,
Peak-Hold, and Fast Comparator
Functions
Zerø-Drift, Low-Cost, Analog Current
Shunt Monitor Series in Small
Package
Zerø-Drift, Bi-Directional Current
Power Monitor with Two-Wire
Interface
DEVICE
INA209
INA210–INA214
INA219
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
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.
All trademarks are the property of their respective owners.
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.
Copyright © 2009, Texas Instruments Incorporated