UCS1001-3 datasheet(46/57 Pages) MICROCHIP

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USB Port Power Controller with Charger Emulation

Datasheet

Revision 1.4 (07-16-13)

SMSC UCS1001

DATASHEET

8.8.2

Emulation Cycling

In Dedicated Charger Emulation Cycle mode, the charger emulation profiles will be applied in the

following order:

1. Legacy 1

2. Legacy 2

3. Legacy 3

4. Legacy 4

5. Legacy 5

6. Legacy 6

7. Legacy 7

APPLICATION NOTE: If S0=’0’ and a portable device is not attached in DCE Cycle mode, the UCS1001 will be

cycling through charger emulation profiles. There is no guarantee which charger emulation

profile will be applied first when a portable device attaches.

The UCS1001 will apply a charger emulation profile until one of the following exit conditions occurs:

1. Current greater than IBUS_CHG is detected flowing out of VBUS at the respective emulation timeout

time. In this case, the profile is assumed to be accepted and no other profiles will be applied.

2. The respective emulation timeout (tEM_TIMEOUT) time is reached without current that exceeds the

IBUS_CHG limit flowing out of VBUS. The profile is assumed to be rejected, and the UCS1001 will

perform emulation reset and apply the next profile, if there is one.

8.8.3

DCE Cycle Retry

If none of the charger emulation profiles cause a charge current to be drawn, the UCS1001 will perform

emulation reset and cycle through the profiles again. The UCS1001 will continue to cycle through the

profiles so as long as charging current is not drawn and the PWR_EN control is enabled.

8.9

Current Limit Mode Associations

The UCS1001 will close the port power switch and use the current limiting mode as shown in Table 8.2.

Table 8.2 Current Limit Mode Options

ACTIVE MODE

CURRENT LIMIT MODE

Data Pass-through

Trip mode

BC1.2 SDP

Trip mode

BC1.2 CDP

CC mode if ILIM < 1.5 A, otherwise, trip mode

BC1.2 DCP

CC mode if ILIM < 1.5 A, otherwise, trip mode

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