UCS1002-2 datasheet(63/114 Pages) MICROCHIP

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Programmable USB Port Power Controller with Charger Emulation

Datasheet

SMSC UCS1002

Revision 1.4 (07-16-13)

DATASHEET

1. The UCS1002 resets the VBUS line by disconnecting the port power switch and connecting VBUS

to ground via an internal 100

Ω resistor for tDISCHARGE time. 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

Ω 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.

9.8.2

Emulation Cycling

In Dedicated Charger Emulation Cycle mode, the charger emulation profiles (if enabled) will be applied

in the following order:

1. Legacy 1

2. BC1.2 DCP

3. Legacy 2

4. Legacy 3

5. Legacy 4

6. Legacy 5

7. Legacy 6

8. Legacy 7

9. Custom (disabled by default). If the CS1_FIRST configuration bit is set, then the Custom charger

emulation profile will be tested first and the order will proceed as given.

APPLICATION NOTE: If S0=’0’ and a portable device is not attached in DCE Cycle mode, the UCS1002 will be

cycling through charger emulation profiles(by default). There is no guarantee which charger

emulation profile will be applied first when a portable device attaches.

The UCS1002 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 emulation timeout is enabled by default, see Section

10.4.2, "Emulation Configuration - 16h" and Section 10.13.1, "Custom Emulation Configuration -

40h"). The profile is assumed to be rejected, and the UCS1002 will perform emulation reset and

apply the next profile, if there is one.

Emulation timeouts can be programmed for each charger emulation profile (see Section 10.11,

"Preloaded Emulation Timeout Configuration Registers" and Section 10.13.1, "Custom Emulation

Configuration - 40h").

9.8.3

DCE Cycle Retry

If none of the charger emulation profiles cause a charge current to be drawn, the UCS1002 will perform

emulation reset and cycle through the profiles again (if the EM_RETRY bit is set (default - see Section

10.4.2, "Emulation Configuration - 16h")). The UCS1002 will continue to cycle through the profiles so

as long as charging current is not drawn and the PWR_EN control is enabled.If the Emulation Retry

is not enabled, the UCS1002 will flag “no handshake” and end the DCE Cycle using trip current

limiting.

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