INA209_17 Datasheet, PDF (1/50 Pages) Texas Instruments – High-Side Measurement, Bi-Directional Current/Power Monitor with I2C Interface

INA209
INA209
www.ti.com ......................................................................................................................................................... SBOS403B – JUNE 2007 – REVISED MARCH 2009
High-Side Measurement, Bi-Directional Current/Power Monitor
with I²C™ Interface
FEATURES
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•23 SENSES BUS VOLTAGES FROM 0V TO +26V
• REPORTS CURRENT, VOLTAGE, AND
POWER; STORES PEAKS
• TRIPLE WATCHDOG LIMITS:
– Lower Warning with Delay
– Upper Over-limit, No Delay
– Fast Analog Critical
• HIGH ACCURACY: 1% MAX OVER TEMP
APPLICATIONS
• SERVERS
• TELECOM EQUIPMENT
• AUTOMOTIVE
• POWER MANAGEMENT
• BATTERY CHARGERS
• WELDING EQUIPMENT
• POWER SUPPLIES
• TEST EQUIPMENT
V_IN+ V_IN-
V_S
(Supply Voltage)
Critical
DAC +
Critical
DAC -
CMP
CMP
Filter
INA209
Critical
Watchdog
Overlimit
Warning
DESCRIPTION
The INA209 is a high-side current shunt and power
monitor with an I²C interface. The INA209 monitors
both shunt drop and shunt bus voltage. A
programmable calibration value, combined with an
internal multiplier, enables direct readouts in
amperes. An additional multiplying register calculates
power in watts. The INA209 features two separate,
onboard watchdog capabilities: a warning comparator
and an over-limit comparator. The warning
comparator is useful for monitoring lower warning
limits and incorporates a user-defined delay. The
over-limit comparator assists with monitoring upper
limits that could require immediate system shutdown.
The INA209 also includes an analog comparator and
a programmable digital-to-analog converter (DAC)
that combine to provide the fastest possible
responses to current overload conditions.
The INA209 can be used together with hot swap
controllers that already use a current sense resistor.
The INA209 full-scale range can be selected to be
either within the hot-swap controller sense limits, or
wide enough to include them.
The INA209 senses across shunts on buses that can
vary from 0V to 26V. The device uses a single +3V to
+5.5V supply, drawing a maximum of 1.5mA of
supply current. It is specified for operation from
–25°C to +85°C.
GND
ADC
´
Power Register
Current Register
Voltage Register
I²C
Interface
Convert
GPIO
Alert
Data
CLK
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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.
I2C is a trademark of NXP Semiconductors.
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All other trademarks are the property of their respective owners.
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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 © 2007–2009, Texas Instruments Incorporated