UCS1003-1 datasheet(76/138 Pages) MICROCHIP

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UCS1003-1/2/3

DS20005346B-page 76

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bit 2

EM_RESP:

Leave Emulation Response bit(2)

Enables the Dedicated Charger Emulation Cycle mode to hold the DPOUT and DMOUT stimulus response

after the UCS1003-1 has finished emulation using the Legacy, BC1.2 DCP or custom charger emulation

profiles.

= If a portable device begins drawing charging current while the UCS1003-1 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 tempera-

ture exceeds the TREG value or emulation is restarted. In the case of the BC1.2 DCP or Legacy 2

charger emulation profiles, this will be the short (RDCP_RES). In the case of the Legacy 1 or

Legacy 3-7 profiles, this will be the DPOUT and DMOUT pin voltages. If a portable device does not

draw charging current, the DCE Cycle will behave normally.

= 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.

bit 1-0

EM_RESET_TIME<1:0>:

tEM_RESET Length Time bit

Determines the length of the tEM_RESET time (see Section 9.8.1 “Emulation Reset”) as shown below.

The value selected does not include discharge time; however, this value plus discharge result in the

actual Reset time.

=50 ms

=75 ms

=125 ms

=175 ms

EMULATION CONFIGURATION REGISTER (ADDRESS 16h) (CONTINUED)

Note 1:

If the EM_TO_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

time-out after applying any test profiles and charging with the ‘final’ profile.

If the HSW_DCE bit is set, the high-speed switch will be closed regardless of the status of the EM_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.

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