Charging Mobile Devices from Shutdown PCs Becomes Reality with Unique USB Chips from STMicroelectronics
(Thomson Reuters ONE) -
USB charger emulators featuring patented attach detection and unique charge-
termination capability make mobile charging friendlier for the environment and
users alike
Geneva, July 25, 2013 - STMicroelectronics (NYSE: STM), a global semiconductor
leader serving customers across the spectrum of electronics applications, has
perfected advanced features in its latest PC USB chips that significantly reduce
the environmental impact of charging mobile devices.
As smartphones and media players typically connect to a PC for data exchange,
users are tending also to charge their devices from PC USB ports. Indeed, the
International Electrotechnical Commission's (IEC) universal phone-charger
standard[1] promotes USB charging by making use of the USB interface
specification. The IEC says[2] the standard could help reduce the 51,000 tons of
redundant chargers produced each year and cut the mobile industry's annual
greenhouse gas emissions by 13.6 million tons.
ST's new STCC5011 and STCC5021 go a step further in saving energy and reducing
CO(2) emissions by allowing users to charge mobile devices from a USB port even
when the computer is in software-controlled shutdown mode. Using a unique
attach-detection feature, which is patented by ST and operates when the PC is
shut down, the chips (called charger emulators) can detect when a mobile device
has been connected. This enables the PC's power supply to be activated for
charging. The chips also monitor current to turn the power supply off when
charging is complete and thereby maximize the energy savings. Other charger
emulators require the PC to be in working or sleep mode to charge the device,
which consumes more power than when the PC is in shutdown mode.
Charging in PC shutdown mode with the STCC5011 or STCC5021 improves the energy
efficiency of USB charging and makes it more convenient for end users. Moreover,
when the USB port is active and waiting for a device to be connected for
charging, ST's chips consume only 1/16 of the power of other charger emulators.
This allows PCs to offer convenient USB charging with minimal impact on power
consumption or PC battery life during normal use. Both chips have circuitry to
avoid discharging the PC's battery, which allows even the most mobile of users
to charge devices safely while using the PC on battery power alone.
The STCC5011 has a 1A charge-current limit suitable for Apple iPod® and iPhone®.
The STCC5021 has a limit of 2A for charging iPad® as well as iPod and iPhone.
Both chips are compatible with the USB battery charging standard BC1.2, USB2.0,
USB3.0, and Chinese telecommunications standard YD/T 1591-2009, which mandates
use of USB charging to reduce electronic waste and protect the environment. They
also support proprietary chargers such as BlackBerry® charging mode, as well as
Apple® divider mode (for 1A and 2A charging, as described above).
Major features of STCC5011/5021:
* Pin-selectable charger-emulation profiles
* USB2.0-compliant USB data switch with 1000MHz bandwidth
* Low-resistance (60 milli-ohm) integrated power switch
* Built-in safety protection
* Charging-indication output in DCP (Dedicated Charging Port) and CDP
(Charging Downstream Port) modes
Operation in PC Advanced Configuration & Power Interface (ACPI) modes:
* Support for remote wakeup in ACPI S3 mode (PC sleep mode)
* Device attachment detection in ACPI G2 mode (shutdown/soft-off, or S5)
The STCC5011 and STCC5021 are in production now, available in the VFQFPN 16-pin
3 x 3 x 0.8mm package, priced from $0.75 for orders over 1,000 pieces.
For further information on ST's USB charger emulators please go to
http://www.st.com/usbcharging
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 www.st.com.
For Press Information Contact:
STMicroelectronics
Michael Markowitz
Director Technical Media Relations
+1 781 591 0354
michael.markowitz(at)st.com
--------------------------------------------------------------------------------
[1] IEC 62684
[2] http://www.iec.ch/newslog/2011/nr0311.htm
USB Chargers from STMicroelectronics_IMAGE:
http://hugin.info/152740/R/1718705/571822.jpg
USB Chargers from STMicroelectronics:
http://hugin.info/152740/R/1718705/571821.pdf
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