UCS81003 datasheet(22/108 Pages) MICROCHIP

22 / 108 page

UCS81003

DS20005334A-page 22

 2014 Microchip Technology Inc.

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, oper-

ation 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

Overcurrent limit

POR

Power-on Reset

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 Detection

A Removal Detection event occurs when the current load on the VBUS pin drops to less than

IREM_QUAL for longer than tREM_QUAL.

Removal

The physical removal of a portable device from a USB port that the UCS81003 is controlling.

Response

An action, usually in response to a stimulus, in charger emulation performed by the

UCS81003 device via the USB data lines.

SDP or USB-IF SDP

Standard downstream port. The combination of the UCS81003 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 0.5A while data communica-

tion is active.

Signature

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

cation from the UCS81003 to the portable device.

Stand-Alone Mode

Indicates that the communications protocol is not active and all communications between the

UCS81003 and a controller are done via the external pins only (M1, M2, EM_EN, PWR_EN,

S0 and LATCH as inputs, and ALERT# and A_DET# as outputs).

Stimulus

An event in charger emulation detected by the UCS81003 device via the USB data lines.

TABLE 4-1:

TERMS AND ABBREVIATIONS (CONTINUED)

Term/Abbreviation

Description

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