UCS1002-1 datasheet(65/116 Pages) MICROCHIP

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Programmable USB Port Power Controller with Charger Emulation

Datasheet

SMSC UCS1002

Revision 1.4 (07-16-13)

DATASHEET

Portable devices that can cause this are generally ones that pull up DPOUT to some voltage and leave

it there, or apply the wrong voltage.

9.11

Preloaded Charger Emulation Profiles

The following charger emulation profiles are resident to the UCS1002:

1. Legacy 1, 3, 4, and 6 - See Section 9.11.3

2. Legacy 2 - See Section 9.11.2

3. Legacy 5 - See Section 9.11.4

4. Legacy 7 - See Section 9.11.5

5. BC1.2 CDP - See Section 9.6.1

6. BC1.2 DCP - See Section 9.7.1

Additionally, the user may “build” a charger emulation profile by determining the voltage and resistance

characteristics that are placed on each of the DPOUT and DMOUT pins. See Section 9.12, "Custom

Charger Emulation Profile".

9.11.1

BC1.2 DCP Charger Emulation Profile Within DCE Cycle

When the BC1.2 DCP charger emulation profile (Section 9.7.1, "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 9.1) because the tEM_TIMEOUT timer is enabled (by default) during the DCE Cycle.

During the DCE Cycle after the DCP charger emulation profile, the UCS1002 will perform one of the

following:

1. If the portable device is drawing more than IBUS_CHG current when the tEM_TIMEOUT timer expires,

the UCS1002 will flag that a BC1.2 DCP was detected. The UCS1002 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 does not draw more than IBUS_CHG current when the tEM_TIMEOUT timer

expires, the UCS1002 will stop applying the DCP charger emulation profile and proceed to the next

charger emulation profile in the DCE Cycle.

9.11.2

Legacy 2 Charger Emulation Profile

The Legacy 2 charger emulation profile does the following:

1. The UCS1002 will connect a resistor (RDCP_RES) between DPOUT and DMOUT.

2. VBUS is applied.

3. If the portable device draws more than IBUS_CHG current when the tEM_TIMEOUT timer expires

(enabled by default), the UCS1002 will accept that this is the correct charger emulation profile for

the attached portable device. Charging commences. The resistive short between the DPOUT and

DMOUT pins will be left in place. The UCS1002 will use constant current limiting.

4. If the portable device does not draw more than IBUS_CHG current when tEM_TIMEOUT timer expires,

the UCS1002 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 UCS1002 will initiate

the next charger emulation profile.

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