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

New Battery "Fuel Gauge" IC From STMicroelectronics Gives Reliable Runtimes for 
Mobile Users 
Innovative State-of-Charge Calculator Maintains Accurate Fuel Gauging
With Battery Age and Usage 
GENEVA -- (Marketwire) -- 02/14/13 --   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
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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