UCS1002-3 datasheet(58/114 Pages) MICROCHIP

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UCS1002-3

DS20006852A-page 58

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10.4.3

SWITCH CONFIGURATION

The contents of this register are retained in Sleep.

bit 3

EM_RETRY: Configures whether the DCE Cycle must be reset or restarted 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 UCS1002-3 is configured to emulate a dedicated charger.

1 = Once the DCE Cycle is completed, it performs Emulation Reset and restarts from the first enabled

charger emulation profile in the DCE Cycle.

0 = Once the DCE Cycle is completed, it does not restart. The DPOUT and DMOUT are left as High

Z pins and the port power switch is closed. The Current Limiting mode is determined by the Cus-

tom Current Limiting Behavior settings (see Section 10.14.2 “Custom Current Limiting Behav-

ior Configuration Register”).

bit 2

EM_RESP: Leave Emulation Response – enables the Dedicated Charger Emulation Cycle mode to

hold the DPOUT and DMOUT stimulus response after the UCS1002-3 has finished emulation using the

Legacy, BC1.2 DCP, or Custom charger emulation profiles (Note 2).

1 = If a portable device begins drawing charging current while the UCS1002-3 is applying the BC1.2

DCP, Custom or any of the Legacy charger emulation profiles during the DCE Cycle, the last

response applied is kept in place until a Removal Detection event occurs, the internal temperature

exceeds the TREG value, or emulation is restarted. In the case of the BC1.2 DCP or Legacy 3

charger emulation profiles, this is the short (RDCP_RES). In the case of the Legacy 1, Legacy 2 or

Legacy 4-7 profiles, this is the DPOUT and DMOUT pin voltages. If a portable device does not

draw charging current, the DCE Cycle behaves normally.

0 = The dedicated emulation circuitry behaves normally. It removes 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]: 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.

00 = 50 ms

01 = 75 ms

10 = 125 ms

11 = 175 ms

Note 1: If the EM_TO_DIS bit is set and the Legacy 2, Legacy 4 or Custom charger emulation profiles are

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.

2: If the HSW_DCE bit is set, the high-speed switch is closed regardless of the status of the EM_RESP bit.

Leaving the emulation response applied does not enable normal USB traffic. Therefore, prior to setting the

HSW_DCE bit, this bit must be cleared.

EMULATION CONFIGURATION REGISTER (ADDRESS 16h) (CONTINUED)

R/W-0

U-x

R/W-0

R/W-1

R/W-0

PIN_IGNORE

—

EM_EN_SET

M2_SET

M1_SET

S0_SET

PWR_EN_SET LATCH_SET

bit 7

bit 0

Legend:

R = Readable bit

W = Writable bit

U = Unimplemented bit

-n = Value at POR

‘1’ = Bit is set

‘0’ = Bit is cleared

x = Bit is unknown

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