UCS2112 datasheet(17/64 Pages) MICROCHIP

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 2015 Microchip Technology Inc.

DS20005424B-page 17

UCS2112

4.0

TERMS AND ABBREVIATIONS

Note:

The PWR_EN1 and PWR_EN2 pins each have configuration bits (“<pin name>_S” in General

Configuration 1 register (Address 11h) and General Configuration 2 register (Address 12h)) that may be

used to perform the same function as the external pin state. These bits are accessed via the SMBus/I2C™

and are OR’d with the respective pin. This OR’d combination of pin state and register bit is referenced as

the <pin name> control.

TABLE 4-1:

TERMS AND ABBREVIATIONS

Term/Abbreviation

Description

Attach Detection

An Attach Detection event occurs when the current drawn by a portable device is greater than

IDET_QUAL for longer than tDET_QUAL.

Attachment

The physical insertion of a portable device into a USB port that UCS2112 is controlling.

Constant Current

CDM

Charged Device Model. JEDEC model for characterizing susceptibility of a device to damage

from ESD.

Current Limiting

Mode

Determines the action that is performed when the IBUS current reaches the ILIM threshold. Trip

opens the port power switch. Constant Current (variable slope) allows VBUS to be dropped by

the portable device.

Disconnection

USB-IF term which refers to the loss of active USB communications between a USB host and

a USB device.

Dynamic Thermal

Management

The UCS2112 automatically adjusts port power switch limits and modes to lower internal

power dissipation when the thermal regulation temperature value is approached.

HBM

Human Body Model

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, oper-

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

VBUS_MIN, the port power switch is opened.

OCL

Overcurrent limit

POR

Power-on Reset

Portable Device

USB device attached to the USB port.

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 UCS2112 is controlling.

Stand-Alone Mode

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

UCS2112 and a controller are done via the external pins only (PWR_EN1 and PWR_EN2 as

inputs, and ALERT1#, ALERT2#, A_DET1# and A_DET2# as outputs).

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