UCS1001 datasheet(46/59 Pages) MICROCHIP

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USB Port Power Controller with Charger Emulation

Datasheet

Revision 1.2 (05-21-12)

SMSC UCS1001

DATASHEET

8.10

Preloaded Charger Emulation Profiles

The following charger emulation profiles are resident to the UCS1001:

1. Legacy 1 - See Section 8.10.3

2. Legacy 2 - See Section 8.10.2

3. Legacy 3 - See Section 8.10.3

4. Legacy 4 - See Section 8.10.3

5. Legacy 5 - See Section 8.10.4

6. Legacy 6 - See Section 8.10.4

7. Legacy 7 - See Section 8.10.5

8. BC1.2 CDP - See Section 8.6.1

9. BC1.2 DCP - See Section 8.7.1

8.10.1

BC1.2 DCP Charger Emulation Profile Within DCE Cycle

When the BC1.2 DCP charger emulation profile (Section 8.7.1, "BC1.2 DCP Charger Emulation

Profile") is applied within the DCE Cycle (Dedicated Charger Emulation Cycle is selected as the Active

mode), the behavior after the profile is applied is different than Active mode BC1.2 DCP (BC1.2 DCP

in Table 8.1) because the tEM_TIMEOUT timer is enabled during the DCE Cycle.

During the DCE Cycle after the DCP charger emulation profile, the UCS1001 will perform one of the

following:

1. If the portable device is charging, the UCS1001 will internally flag that a BC1.2 DCP was detected.

The UCS1001 will leave in place the resistive short

leave the high-speed switch open, and then

enable constant current limiting (variable slope).

2. If the portable device is not charging, the UCS1001 will stop applying the DCP charger emulation

profile and proceed to the next charger emulation profile in the DCE Cycle.

8.10.2

Legacy 2 Charger Emulation Profile

The Legacy 2 charger emulation profile does the following:

1. The UCS1001 will connect a resistor (RDCP_RES) between DPOUT and DMOUT.

2. VBUS is applied.

3. If the portable device is charging, the UCS1001 will accept that this is the correct charger emulation

profile for the attached portable device. The resistive short between the DPOUT and DMOUT pins

will be left in place. The UCS1001 will use constant current limiting.

4. If the portable device is not charging, the UCS1001 will stop the Legacy 2 charger emulation. This

will cause resistive short between the DPOUT and DMOUT pins to be removed. Emulation reset

occurs, and the UCS1001 will initiate the next charger emulation profile.

8.10.3

Legacy 1, 3, 4, and 6 Charger Emulation Profiles

Legacy 1, 3, 4, and 6 charger emulation profiles follow the same pattern of operation although the

voltage that is applied on the DPOUT and DMOUT pins will vary. They do the following:

1. The UCS1001 will apply a voltage on the DPOUT pin using either a current-limited voltage source

or a voltage divider between VBUS and ground with the center tap on the DPOUT pin.

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