UCS1002-2 datasheet(79/114 Pages) MICROCHIP

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Programmable USB Port Power Controller with Charger Emulation

Datasheet

SMSC UCS1002

Revision 1.4 (07-16-13)

DATASHEET

Bits 1 - 0 - RATION_BEH[1:0] - Controls the behavior when the power rationing threshold is reached

as shown in Table 7.1.

10.4.2

Emulation Configuration - 16h

The contents of this register are retained in Sleep.

Bit 7 - DIS_TO - Disables the timeout and idle reset functionality (see Section 4.2.1.6, "SMBus Timeout

and Idle Reset").



‘0’ - The timeout and idle reset functionality is enabled.



‘1’ (default) - The timeout and idle reset functionality is disabled. This is used for I2C compliance.

Bit 4 - EM_TIMEOUT_DIS - Disables the emulation circuitry timeout for all charger emulation profiles

in the DCE Cycle. There is a separate bit to enable / disable the emulation timeout for the Custom

charger emulation profile (Section 10.13.1, "Custom Emulation Configuration - 40h"); however, if the

EM_TIMEOUT_DIS bit is set, the emulation timeout will also be disabled for the Custom charger

emulation profile.

APPLICATION NOTE: If the EM_TIMEOUT_DIS bit is set and the Legacy 1, Legacy 3, or Custom charger

emulation profiles were accepted during the DCE cycle, a removal is not detected. To avoid

this issue, re-enable the emulation timeout after applying any test profiles and charging with

the 'final' profile.



‘0’ (default) - Emulation timeout is enabled during the Dedicated Charger Emulation Cycle. An

individual charger emulation profile will be applied and maintained for the duration of the

tEM_TIMEOUT value. When this timer expires, the UCS1002 will determine whether the charger

emulation profile was successful and take appropriate action.



‘1’ - Emulation timeout is disabled during the DCE Cycle. The applied charger emulation profile will

not exit as a result of an emulation timeout event. The IBUS current will be checked continuously

and if it exceeds the IBUS_CHG threshold for any reason, the charger emulation profile will be

accepted.

Bit 3 - EM_RETRY - Configures whether the DCE Cycle will reset and restart if it reaches the final

profile without the portable device drawing charging current and accepting one of the profiles. This bit

is only used if the UCS1002 is configured to emulate a dedicated charger.



‘0’ - Once the DCE Cycle is completed, it will not restart. The DPOUT and DMOUT will be left as

High-Z pins and the port power switch will be closed. The current limiting mode is determined by

the Custom current limiting behavior settings (see Section 10.14.2, "Custom Current Limiting

Behavior Configuration - 51h").



‘1’ (default) - Once the DCE Cycle is completed, it will perform emulation reset and restart from the

first enabled charger emulation profile in the DCE Cycle.

Bit 2 - LEAVE_EMU_RESP - Enables the Dedicated Charger Emulation Cycle mode to hold the

DPOUT and DMOUT stimulus response after the UCS1002 has finished emulation using the Legacy,

BC1.2 DCP, or Custom charger emulation profiles.

APPLICATION NOTE: If the HSW_DCE bit is set, the high-speed switch will be closed regardless of the status of

the LEAVE_EMU_RESP bit. Leaving the emulation response applied will not allow normal

USB traffic. Therefore, prior to setting the HSW_DCE bit, this bit should be cleared.



‘0’ - The dedicated emulation circuitry will behave normally. It will remove the short condition when

the tEM_TIMEOUT timer has expired regardless if the portable device has drawn charging current or

not.



‘1’ (default) - If a portable device begins drawing charging current while the UCS1002 is applying

the BC1.2 DCP, Custom, or any of the Legacy charger emulation profiles during the DCE Cycle,

the last response applied will be kept in place until a Removal Detection event occurs, the internal

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