AN2865 Datasheet, PDF (1/17 Pages) STMicroelectronics – STUSBCD01B configuration and operation

AN2865
Application note
STUSBCD01B configuration and operation
Introduction
With the ever-increasing number of mobile devices adopting the USB bus as the standard
communication port and source for recharging, a standardization of the characteristics of
the charging devices and methods to detect them is required to optimize the performance of
the charging process and reduce the risks of damaging standard USB ports.
The new USB battery charging specification provides rules and guidelines to follow when
designing new USB architectures capable of battery charging and when defining new
charging host ports. The specification also extends the range of current which can be drawn
from a USB port.
In order to be able to distinguish between this new class of USB ports, standard USB host
ports and dedicated chargers, the new specification also defines detection methods which
must be used to determine the right amount of current the portable device can draw from the
USB bus. This also guarantees backward compatibility with standard USB ports.
The STUSBCD01B is a USB charging detection IC developed on the base of the USB
battery charging specification which can be easily added in new platforms to provide them
with charging detection capability.
September 2009
Doc ID 15283 Rev 1
1/17
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