UCS1001 datasheet(23/59 Pages) MICROCHIP

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USB Port Power Controller with Charger Emulation

Datasheet

SMSC UCS1001

Revision 1.2 (05-21-12)

DATASHEET

Chapter 4 General Description

The UCS1001 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 UCS1001 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), most Apple and RIM portable devices, and many others.

Figure 4.1 shows a system configuration in which the UCS1001-1 provides a port power switch, low

power Attach Detection, and charging active signaling. Figure 4.2 shows a system configuration in

which the UCS1001-2 provides a port power switch, low power Attach Detection, and portable device

Attach Detection signaling. These configurations are useful for applications that already provide USB

BC1.2 and/or legacy data line handshaking on the USB data lines, but still require port power

switching.

Figure 4.1 UCS1001-1 System Configuration (No Charger Emulation)

UCS1001-1

LATCH

ALERT#

PWR_EN

3 V – 5.5 V

GND

Device

DPIN

DMIN

DPOUT

DMOUT

VDD

5 V

VBUS1

VBUS2

VS1

VS2

ILIM

3 V – 5.5 V

Auto-recovery

Upon Fault

Latch

Upon Fault

EM_EN

SEL

CHRG#

5 V Host

CBUS

USB Host

(DP, DM)

Disable Detect

State

Enable

Detect State

CIN

VDD

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