UCS1001 datasheet(9/59 Pages) MICROCHIP

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USB Port Power Controller with Charger Emulation

Datasheet

SMSC UCS1001

Revision 1.2 (05-21-12)

DATASHEET

IBUS_R2MIN

Current limiter mode boundary.

ILIM

The IBUS current threshold used in current limiting. In trip mode, when ILIM is reached,

the port power switch is opened. In constant current mode, when the current exceeds ILIM,

operation continues at a reduced voltage and increased current; if VBUS voltage drops

below VBUS_MIN, the port power switch is opened.

Legacy

USB devices that require non-BC1.2 signatures be applied on the DPOUT and DMOUT

pins to enable charging.

OCL

Over-current limit.

portable device

USB device attached to the USB port.

power thief

A USB device that does not follow the handshaking conventions of a BC1.2 device or

Legacy devices and draws current immediately upon receiving power (i.e., a USB book

light, portable fan, etc).

removal

The physical removal of a portable device from a USB port that the UCS1001 is controlling.

SDP or USB-IF SDP

Standard downstream port. The combination of the UCS1001 high-speed switch being

closed with an upstream USB host present comprises a BC1.2 SDP. This enables a BC1.2

compliant portable device to simultaneously draw current up to 0.5 A while data

communication is active.

signature

Application of a charger emulation profile without waiting for a response. One-way

communication from the UCS1001 to the portable device.

Table 1.1 Terms and Abbreviations (continued)

TERM /

ABBREVIATION

DESCRIPTION

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