UCS1002-2 datasheet(62/114 Pages) MICROCHIP

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Programmable USB Port Power Controller with Charger Emulation

Datasheet

Revision 1.4 (07-16-13)

SMSC UCS1002

DATASHEET

4. Optional Secondary Detection - If the portable device then drives a voltage of 0.6 V (nominal) onto

the DMOUT pin, the UCS1002 will take no other action. This will cause the portable device to

observe a ‘0’ on the DPOUT pin and know that it is connected to a CDP.

9.7

BC1.2 DCP

When BC1.2 DCP is selected as the Active mode, UCS1002 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 automatically disabled. When the BC1.2 DCP charger

emulation profile is applied within the Dedicated Charger Emulation Cycle (see Section 9.11.1, "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 UCS1002 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.

9.7.1

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 UCS1002

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 UCS1002 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.

9.8

Dedicated Charger

When commanded to Dedicated Charger Emulation Cycle mode, the UCS1002 enables an attached

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

predefined sequence. Using these profiles, the UCS1002 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.Other levels, sequences, and protocols are configurable via the SMBus / I2C.

When a charger emulation profile is applied, a programmable timer for the emulation profile is started.

When emulation timeout occurs, the UCS1002 checks the IBUS current against a programmable

threshold. If the current is above the threshold, the charger emulation profile is accepted and the

associated current limiting mode is applied.No active USB data communication is possible when

charging in this mode(by default - see Section 10.4.5, "High-speed Switch Configuration - 25h").

9.8.1

Emulation Reset

Prior to applying any of the charger emulation profiles, the UCS1002 will perform an emulation reset.

This involves the following:

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