UCS1002-3 datasheet(21/114 Pages) MICROCHIP

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DS20006852A-page 21

UCS1002-3

5.0

GENERAL DESCRIPTION

The UCS1002-3 provides a single USB port power

switch for precise control of up to 2.5A continuous

current with Overcurrent Limit (OCL), dynamic thermal

management, latch or auto-recovery fault handling,

selectable

active-low

active-high

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

UCS1002-3 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 UCS1002-3 also provides current monitoring to

enable 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 must

provide power without excessively draining the battery,

or require power allocation depending on application

activities.

Figure 5-1 shows a UCS1002-3 full-featured system

configuration in which the UCS1002-3 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:

UCS1002-3 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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