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

STMicroelectronics : 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, February 14, 2013 - 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 0.45µA while continuing to monitor the
battery, and a 2µA 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

Key features of STC3115:

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

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

For Press Information Contact:

Michael Markowitz
Director Technical Media Relations
+1 781 591 0354
Battery Fuel Gauge from ST
Battery Fuel Gauge from ST_IMAGE


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Source: STMicroelectronics via Thomson Reuters ONE
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