UCS1003-2 datasheet(75/138 Pages) MICROCHIP

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 2014-2015 Microchip Technology Inc.

DS20005346B-page 75

UCS1003-1/2/3

10.4.2

EMULATION CONFIGURATION

The contents of this register are retained in Sleep.

EMULATION CONFIGURATION REGISTER (ADDRESS 16h)

R/W-1

U-0

R/W-0

R/W-1

R/W-0

DIS_TO

—

—EM_TO_DIS(1) EM_RETRY

EM_RESP(2)

EM_RESET_TIME<1:0>

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

bit 7

DIS_TO:

Disable Time-out and Idle Reset bit (see Section 11.2.1.6 “SMBus Time-out and Idle Reset”)

= The Time-out and Idle Reset functionality is disabled; this is used for I2C compliance

= The Time-out and Idle Reset functionality is enabled

bit 6-5

Unimplemented:

Read as ‘0’

bit 4

EM_TO_DIS:

Emulation Time-out Disable bit(1)

Disables the emulation circuitry time-out for all charger emulation profiles in the DCE Cycle. There is a

separate bit to enable/disable the emulation time-out for the custom charger emulation profile

(Register 10-35); however, if the EM_TO_DIS bit is set, the emulation time-out will also be disabled for

the custom charger emulation profile.

= Emulation time-out is disabled during the DCE Cycle. The applied charger emulation profile will not

exit as a result of an emulation time-out 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.

= Emulation time-out is enabled during the DCE Cycle. An individual charger emulation profile will be

applied and maintained for the duration of the tEM_TIMEOUT value. When this timer expires, the

UCS1003-1 will determine whether the charger emulation profile was successful and take appropriate

action.

bit 3

EM_RETRY:

Dedication Charger Emulation bit

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 UCS1003-1

is configured to emulate a dedicated charger.

= Once the DCE Cycle is completed, it will perform emulation Reset and restart from the first enabled

charger emulation profile in the DCE Cycle.

= 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 Register”

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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