UCS1003-3 datasheet(29/138 Pages) MICROCHIP

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 2014-2015 Microchip Technology Inc.

DS20005346B-page 29

UCS1003-1/2/3

5.0

GENERAL DESCRIPTION

The UCS1003-1/2/3 family of devices provides a single

USB port power switch for precise control of up to 3.0A

continuous current with Overcurrent Limit (OCL),

dynamic thermal management, latch or auto-recovery

Fault handling, selectable active-high or active-low

enable, Undervoltage and Overvoltage 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

UCS1003-1/2/3 provides charger emulation profiles to

charge a wide variety of portable devices, including

USB-IF BC1.2 (CDP or DCP modes), YD/T-1591 (2009),

12W charging, most Apple, Samsung and RIM portable

devices, and many others (refer to Section 9.0 “Active

State”

for more information on preloaded charger

emulation profiles). The UCS1003-1 has a custom

programmable charger emulation profile for portable

device support for fully host controlled charger emulation.

The UCS1003-1 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 need to provide power

without excessively draining the battery or that require

power allocation depending on application activities.

Figure 5-1 shows a UCS1003-1 full-featured system

configuration in which the UCS1003-1 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 emu-

lation, programmable current limiting (as determined

by the accepted charger emulation profile), active

current monitoring and port charge rationing.

FIGURE 5-1:

UCS1003-1 System Configuration (with Charger Emulation, SMBus Control and

USB Host).

UCS1003-1

ALERT#

3V-5.5V

Device

DPOUT

DMOUT

VBUS1

VBUS2

VS1

VS2

A_DET#

5V Host

CBUS

USB Host

3V-5.5V

CIN

VDD

DPIN

DMIN

VDD

EM_EN

PWR_EN

SMDATA

SMCLK

SEL

COMM_SEL/ILIM

GND

VDD

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