UCS1003-3 datasheet(28/138 Pages) MICROCHIP

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UCS1003-1/2/3

DS20005346B-page 28

 2014-2015 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 to 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 UCS1003-1/2/3 is controlling.

Response

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

UCS1003-1/2/3 device via the USB data lines.

SDP or USB-IF SDP Standard Downstream Port. The combination of the UCS1003-1/2/3 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 communication

is active.

Signature

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

communication from the UCS1003-1/2/3 to the portable device.

Stand-Alone Mode

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

UCS1003-1/2/3 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 UCS1003-1/2/3 device via the USB data lines.

TABLE 4-1:

TERMS AND ABBREVIATIONS (CONTINUED)

Term/Abbreviation

Description

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