UCS1001 datasheet(44/59 Pages) MICROCHIP

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USB Port Power Controller with Charger Emulation

Datasheet

Revision 1.2 (05-21-12)

SMSC UCS1001

DATASHEET

8.7

BC1.2 DCP

When BC1.2 DCP is selected as the Active mode, UCS1001 will discharge VBUS and apply the BC1.2

DCP charger emulation profile per the specification. In BC1.2 DCP mode, the emulation timeout and

requirement for portable device current draw are automatically disabled. When the BC1.2 DCP charger

emulation profile is applied within the Dedicated Charger Emulation Cycle (see Section 8.10.1, "BC1.2

DCP Charger Emulation Profile Within DCE Cycle"), the timeout and current draw requirement are

enabled.

If the portable device is charging after the DCP charger emulation profile is applied, the UCS1001 will

leave in place the resistive short, leave the high-speed switch open, and enable constant current

limiting (variable slope).

APPLICATION NOTE: BC1.2 compliance testing may require the S0 control to be set to ‘0’ (Attach and Removal

Detection feature disabled) while testing is in progress.

8.7.1

BC1.2 DCP Charger Emulation Profile

The BC1.2 DCP charger emulation profile is described below.

1. VBUS voltage is applied. A resistor (RDCP_RES) is connected between the DPOUT and DMOUT

pins.

2. Primary Detection - If the portable device drives 0.6 V (nominal) onto the DPOUT pin, the UCS1001

will take no other action than to leave the resistor connected between DPOUT and DMOUT. This

will cause the portable device to see 0.6 V (nominal) on the DMOUT pin and know that it is

connected to a DCP.

3. Optional Secondary Detection - If the portable device drives 0.6 V (nominal) onto the DMOUT pin,

the UCS1001 will take no other action than to leave the resistor connected between DPOUT and

DMOUT. This will cause the portable device to see 0.6 V (nominal) on the DPOUT pin and know

that it is connected to a DCP.

8.8

Dedicated Charger

When commanded to Dedicated Charger Emulation Cycle mode, the UCS1001 enables an attached

portable device to enter its charging mode by applying specific charger emulation profiles in a

predefined sequence. Using these profiles, the UCS1001 is capable of generating and recognizing

several signal levels on the DPOUT and DMOUT pins. The preloaded charger emulation profiles

include ones compatible with BC1.2 DCP, YD/T-1591 (2009) and most Apple and RIM portable

devices.

No active USB data communication is possible when charging in this mode.

8.8.1

Emulation Reset

Prior to applying any of the charger emulation profiles, the UCS1001 will perform an emulation reset.

This involves the following:

1. The UCS1001 resets the VBUS line by disconnecting the port power switch and connecting VBUS

to ground via an internal 100

 resistor. The port power switch will be held open for a time equal

to tEM_RESET at which point the port power switch will be closed and the VBUS voltage applied.

2. The DPOUT and DMOUT pins will be pulled low using internal 15 k

 pull-down resistors.

APPLICATION NOTE: To help prevent possible damage to a portable device, the DPOUT and DMOUT pins have

current limiting in place when the emulation profiles are applied.

UCS1001 Datasheet(PDF) 44 Page - Microchip Technology

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