New Battery "Fuel Gauge" IC From STMicroelectronics Gives Reliable Runtimes for Mobile Users

Thu Feb 14, 2013 9:30am EST

* Reuters is not responsible for the content in this press release.

  GENEVA, Feb 14 (Marketwire) -- 
STMicroelectronics (NYSE: STM), a global semiconductor leader supplying
customers across the spectrum of electronics applications and a leading
manufacturer of standard ICs, has unveiled its latest battery
fuel-gauging device featuring patented innovations that improve long-term
accuracy. This tiny chip, the STC3115, can be used in high-volume
handheld electronics, and has already been selected by Samsung for some
of its recent smartphones. Battery charge indicators -- or fuel gauges --
have become essential for managing devices such as smartphones, laptops
or digital cameras. Accurate "time-remaining" predictions enhance the
user's experience, and can be critical in certain types of portable
electronics such as medical devices. Even so, many of today's
fuel-gauging electronics are susceptible to errors caused by battery
aging, reduced charging efficiency, leakage, variations in system power
demand, and temperature effects.

    To enhance fuel-gauging accuracy, ST has combined several important
advances in its latest adaptive fuel-gauge IC, the STC3115. Until now,
leading devices have used Coulomb counting to monitor energy entering and
leaving the battery, and periodic voltage-mode state-of-charge
measurements to adjust the Coulomb counter for accuracy. The STC3115 uses
both sets of measurements continuously, with OptimGauge(TM), an adaptive
algorithm that tracks the state of charge and corrects the battery model.

    The STC3115 further enhances accuracy by measuring true initial battery
open-circuit voltage and preventing measurement disruptions when
connecting the charger or launching an app. The charging inhibitor is a
patented feature that significantly improves accuracy. Aging and
temperature compensation are built in, and the voltage measurement
accuracy is 0.25%.

    Additional value-added features of the new IC include a low-power mode
that reduces operating current to only 0.45uA while continuing to monitor
the battery, and a 2uA standby mode. An Under-Voltage Lockout (UVLO)
filter prevents short-term fluctuations in battery voltage from causing
unwanted system resets. In addition, the STC3115 saves bill-of-materials
costs by operating directly from the battery voltage without requiring
its own voltage regulator.

    Key features of STC3115:

--  The OptimGauge algorithm, which adjusts the battery charge/discharge
    model over the battery's life
--  Industry-standard I2C connection to application processor
--  Programmable with different battery profiles at manufacture, for
--  Monitors batteries up to 4.5V
--  Monitors multi-cell packs when used with TS941ILT low-power buffer
--  Dedicated "battery-present" input simplifies battery replacement
--  Dedicated alarm output, activated if battery voltage falls below
    threshold level


The STC3115 is in full production in a 1.4 x 2.0mm chip-scale
package, priced from $.95 in quantities of 1,000 pieces. If your company
has high-volume requirements please contact your local ST sales office.

    About STMicroelectronics
 ST is a global leader in the semiconductor
market serving customers across the spectrum of sense and power and
automotive products and embedded processing solutions. From energy
management and savings to trust and data security, from healthcare and
wellness to smart consumer devices, in the home, car and office, at work
and at play, ST is found everywhere microelectronics make a positive and
innovative contribution to people's life. By getting more from technology
to get more from life, ST stands for life.augmented.

    In 2012, the Company's net revenues were $8.49 billion. Further
information on ST can be found at

    Battery Fuel Gauge from ST:

 Battery Fuel Gauge from ST_IMAGE: 


For Press Information Contact:
Michael Markowitz
Director Technical Media Relations
+1 781 591 0354 

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