INA209 Datasheet, PDF (1/43 Pages) Burr-Brown (TI) – High-Side Measurement, Bi-Directional Current/Power Monitor with I2C™ Interface

BurrĆBrown Products
from Texas Instruments
INA209 ®
INA209
SBOS403 – JUNE 2007
High-Side Measurement, Bi-Directional Current/Power Monitor
with I²C™ Interface
FEATURES
• 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
Overlimit Register
Warning Register
Critical
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-to-digital
converter (ADC) 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
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.
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 © 2007, Texas Instruments Incorporated