UCS81003 datasheet(56/108 Pages) MICROCHIP

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UCS81003

DS20005334A-page 56

 2014 Microchip Technology Inc.

10.4.2

EMULATION CONFIGURATION

The contents of this register are retained in Sleep.

bit 2

RTN_RST: Ration Reset – resets the charge rationing functionality. When this bit is set to ‘1’, the Total

Accumulated Charge registers are reset to 00_00h. In addition, when this bit is set, the RATION status

bit will be cleared and, if there are no other errors or active indicators, the ALERT# pin will be released.

EM_EN is Logic 1

EM_EN is Logic 0

bit 1-0

RATION_BEH<1:0>: Controls the behavior when the power rationing threshold is reached as shown

in Table 7-1.

= Report

= Report and Disconnect

= Disconnect and Go to Sleep

= Ignore

GENERAL CONFIGURATION REGISTER (ADDRESS 15H) (CONTINUED)

EMULATION CONFIGURATION REGISTER (ADDRESS 16H)

R/W-1

U-x

R/W-0

R/W-1

R/W-0

DIS_TO

—

EM_TO_DIS

EM_RETRY

EM_RESP

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 Timeout: Disables the Timeout and Idle Reset functionality (see Section 11.2.1.6

“SMBus Timeout and Idle Reset”).

The Timeout and Idle Reset functionality is disabled. This is used for I2C compliance.

The Timeout and Idle Reset functionality is enabled.

bit 6-5

Unimplemented

bit 4

EM_TO_DIS: Emulation Timeout Disable - Disables the emulation circuitry timeout for all charger emu-

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

Custom Charger Emulation profile (Register 10-35); however, if the EM_TO_DIS bit is set, the emula-

tion timeout will also be disabled for the Custom charger emulation profile. (Note 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.

Emulation timeout 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

UCS81003 will determine whether the charger emulation profile was successful and take appro-

priate action.

bit 3

EM_RETRY: Configures whether the DCE Cycle will reset and restart if it reaches the final profile with-

out the portable device drawing charging current and accepting one of the profiles. This bit is only used

if the UCS81003 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”).

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