UCS1002-2 datasheet(10/114 Pages) MICROCHIP

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Programmable USB Port Power Controller with Charger Emulation

Datasheet

Revision 1.4 (07-16-13)

SMSC UCS1002

DATASHEET

Chapter 1 Terms and Abbreviations

APPLICATION NOTE: The M1, M2, PWR_EN, and EM_EN pins each have configuration bits (<pin name>_SET in

Section 10.4.3, "Switch Configuration - 17h") 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 1.1 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 UCS1002 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 UCS1002 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 1.5 A 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 signalling 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 UCS1002 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 1.5 A with constant current

limiting (and beyond 1.5 A 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.

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