UCS2113 datasheet(16/62 Pages) MICROCHIP

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UCS2113

DS20005680B-page 16

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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

Constant Current

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.

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.

OCL

Overcurrent limit

POR

Power-on Reset

Portable Device

USB device attached to the USB port

Stand-Alone Mode

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

UCS2113 and a controller are done via the external pins only (PWR_EN1 and PWR_EN2 as

inputs, and ALERT1# and ALERT2# as outputs)

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