UCS81003 datasheet(21/108 Pages) MICROCHIP

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DS20005334A-page 21

UCS81003

4.0

TERMS AND ABBREVIATIONS

Note:

The M1, M2, PWR_EN and EM_EN pins each have configuration bits (<pin name>_SET in Section 10.4.3

“Switch Configuration Register”) 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

Active mode

Active power state operation mode: Data Pass-through, BC1.2 SDP, BC1.2 CDP, BC1.2 DCP

or Dedicated Charger Emulation Cycle.

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 UCS81003 is controlling.

Constant Current

CDM

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

from ESD.

CDP or USB-IF

BC1.2 CDP

Charging Downstream Port. The combination of the UCS81003 CDP handshake and an

active standard USB host comprises a CDP. This enables a BC1.2 compliant portable device

to simultaneously draw current up to 1.5A while data communication is active. The USB

high-speed data switch is closed in this mode.

Charge Enable

When a charger emulation profile has been accepted by a portable device and charging

commences.

Charger Emulation

Profile

Representation of a charger comprised of DPOUT, DMOUT and VBUS signaling, which make up

a defined set of signatures or handshaking protocols.

Connection

USB-IF term which refers to establishing active USB communications between a USB host

and a USB device.

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.

DCE

Dedicated Charger Emulation. Charger emulation in which the UCS81003 can deliver power

only (by default). No active USB data communication is possible when charging in this mode

(by default).

DCP or USB-IF

BC1.2 DCP

Dedicated Charging Port. This functions as a dedicated charger for a BC1.2 portable device.

This allows the portable device to draw currents up to 1.5A with Constant Current Limiting

(and beyond 1.5A with Trip Current Limiting). No USB communications are possible (by

default).

Dedicated Charger. A charger which inherently does not have USB communications, such as

an A/C wall adapter.

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 UCS81003 automatically adjusts port power switch limits and modes to lower internal

power dissipation when the thermal regulation temperature value is approached.

Enumeration

A USB-specific term indicating that a host is detecting and identifying USB devices.

Handshake

Application of a charger emulation profile that requires a response. Two-way communication

between the UCS81003 and the portable device.

HBM

Human Body Model

HSW

High-Speed switch

IBUS_R2MIN

Current limiter mode boundary

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