UCS1002-2 datasheet(34/114 Pages) MICROCHIP

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Programmable USB Port Power Controller with Charger Emulation

Datasheet

Revision 1.4 (07-16-13)

SMSC UCS1002

DATASHEET

Chapter 5 General Description

The UCS1002 provides a single USB port power switch for precise control of up to 2.5 amperes

continuous current with over-current limit (OCL), dynamic thermal management, latch or auto-recovery

fault handling, selectable active low or high enable, under- and over-voltage lockout, and back-voltage

protection.

Split supply support for VBUS and VDD is an option for low power in system standby states.

In addition to power switching and current limiting, the UCS1002 provides automatic and configurable

charger emulation profiles to charge a wide variety of portable devices, including USB-IF BC1.2 (CDP

or DCP modes), YD/T-1591 (2009), most Apple and RIM portable devices, and many others.

The UCS1002 also provides current monitoring to allow intelligent management of system power and

charge rationing for controlled delivery of current regardless of the host power state. This is especially

important for battery operated applications that want to provide power and do not want to excessively

drain the battery, or that require power allocation depending on application activities.

Figure 5.1 shows a UCS1002 full-featured system configuration in which the UCS1002 provides a port

power switch and low power Attach Detection with wake-up signaling (wake on USB). The current limit

is established at power-up. It can be lowered if required after power-up via the SMBus / I2C. This

configuration also provides configurable USB data line charger emulation, programmable current

limiting (as determined by the accepted charger emulation profile), active current monitoring, and port

charge rationing.

Figure 5.1 UCS1002 Full-Featured System Configuration (SMBus Control)

UCS1002

ALERT#

3 V – 5.5 V

Device

DPOUT

DMOUT

5 V

VBUS1

VBUS2

VS1

VS2

A_DET#

5 V Host

CBUS

USB Host

3 V – 5.5 V

CIN

VDD

DPIN

DMIN

VDD

EM_EN

PWR_EN

SMDATA

SMCLK

SEL

COMM_SEL / ILIM

GND

VDD

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