UCS1002 EVB User Manual
SMSC EVB-UCS1002
14
Revision 1.1 (09-30-11)
PRELIMINARY - SMSC CONFIDENTIAL
Chapter 3 Hardware Description
3.1
UCS1002
The UCS1002 provides a single USB port power switch for precise control of up to 2.5 amperes
continuous current with over current limiting, dynamic thermal management, latch / auto-recovery upon
fault, selectable active low or high enable, under and over voltage lockout, and back-drive protection.
USB Charging Port profiles are integrated into the UCS1002 to assure compliance to multiple
standards. In addition to power switching and USB Charging Port profiling, the UCS1002 provides
automatic and configurable USB data line handshaking to enable charging of USB-IF Battery Charging
1.2 (CDP or DCP modes), YD/T-1591 (2009), Apple®, RIM®, and many other mobile devices.
The UCS1002 provides a device attachment detection output, as well as a dedicated alert output, with
current monitoring, charge rationing for controlled delivery of current regardless of a host’s power state.
When the limit is reached, the UCS1002 will perform the user programmed behavior (report and
disconnect is the default).
3.2
EVB Power Source
This EVB requires a single USB cable to operate. USB bus voltage is provided to the onboard indicator
LEDs and the SMSC USB Bridge. This bridge regulates the +5V USB power to +3.3V used by the
EVB circuitry.
3.3
VS 5V Power Source
A 5V power source is needed for VS to charge the portable device. This can come from a PC USB
port (limited to 500mA) through a USB cable with a Standard-B plug end into the EVB, or from the 5V
wall adapter provided (up to 2.5A).
3.4
USB to SMBus Bridge
The USB to SMBus bridge is based on an 8051 microcontroller with integrated USB to SMBus
interfaces as well as internal flash and RAM. During EVB manufacture, firmware is loaded into the
bridge that provides the interface between the USB and the SMBus. Power is sourced to the
microcontroller from the USB interface.
3.4.1
Direct SMBus Connect Option
It is also possible to connect an external SMBus master to the UCS1002 EVB:
Remove the jumpers on J16 and J18 and connect the SMBus master to pin 1 of the appropriate
header. The USB connection on P3 must remain attached to p3.3V for the chip and
indicator LEDs. Note that ground must be connected to one of the test point grounds on the EVB.
See
for connector pins.