Product category:
Analogue and Mixed Signal ICs
News Release from: Texas Instruments (April 2006-) | Subject: INA209
Edited by the Electronicstalk Editorial
Team on 06 July 2007
Current sensor enable system power
savings
Bidirectional current/power monitor IC provides a high accuracy current sensing solution that offers 1% maximum accuracy.
Texas Instruments has introduced a high-side measurement, bidirectional current/power monitor integrated circuit (IC) with an I2C interface Based on a zero-drift auto-zeroing architecture, the INA209 provides a high accuracy current sensing solution that offers 1% maximum accuracy over the -40 to +85C temperature range, with 100uV maximum offset
This article was originally published on Electronicstalk on 4 Apr 2006 at 8.00am (UK)
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The device enables monitoring and control of current, voltage and power in a variety of applications such as servers, telecomms equipment, battery chargers, power management, automotive and test equipment.
The INA209 monitors the drop across a shunt resistor and senses shunt bus voltage from 0 to +26V.
An internal multiplier and calibration register provide direct data for current in amps and power in watts.
The device operates from a single +3.0 to +5.5V supply.
The device features three levels of programmable watchdogs.
The lowest level includes a programmable delay to ignore transient events.
An intermediate level provides an output with no delay.
A fully programmable fast analogue path enables the highest level of warning for use in implementing immediate system shutdowns.
In addition to the internal filtering for current and voltage measurements, the fast analogue comparator also includes a filter for use in noisy environments.
Full scale readings as low as +/-40mV are available, keeping shunt dissipation to a minimum while a programmable gain amplifier function provides additional higher ranges.
The ADC converts 12bit values in 530us, and offers combinations of lower resolution with higher speed as well as averaging (up to 128 samples).
An external trigger line is available to trigger conversions at specific times.
The I2C interface includes a timeout to prevent bus lock-up and a high speed mode to enable communications up to 3.4MHz.
All features of the INA209 are software programmable.
The INA209 is available now in a TSSOP-16 package from TI and authorised distributors.
The device is priced at US $3.50 in 1000-piece quantities (suggested resale pricing).
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