UCS81003 datasheet(49/108 Pages) MICROCHIP

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 2014 Microchip Technology Inc.

DS20005334A-page 49

UCS81003

OTHER STATUS REGISTER (ADDRESS 0FH)

U-x

R-0

—

ALERT_PIN

ADET_PIN

CHG_ACT

EM_ACT

EM_STEP<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 7-6

Unimplemented

bit 5

ALERT_PIN: Reflects the status of the ALERT# pin. This bit is set and cleared as the ALERT# pin

changes states.

ALERT# pin is asserted low

ALERT# pin is released

bit 4

ADET_PIN: Reflects the status of the A_DET# pin. When set, indicates that the A_DET# pin is asserted

low. This bit is set and cleared as the A_DET# pin changes states. (Note 1)

A_DET# pin is asserted low

A_DET# pin is released

bit 3

CHG_ACT: This bit is automatically set when IBUS > IBUS_CHG and cleared when IBUS < IBUS_CHG.

(Note 2)

=IBUS > IBUS_CHG

=IBUS < IBUS_CHG

bit 2

EM_ACT: Indicates that the UCS81003 is in the Active state and emulating. The actual profile that is

being applied is identified by PRE_EM_SEL<3:0> (see Section 10.12.1 “Applied Charger Emulation

Device is in Active state and emulating

Device is not emulating

bit 1-0

EM_STEP<1:0>: Indicates which stimulus / response pair is currently being applied by the charger emu-

lation profile as shown below. These bits are set and cleared automatically. Note that the Legacy charger

emulation profiles and the BC1.2 DCP charger emulation profile do not use Stimulus / Response Pair #3.

= None Applied. Waiting for current.

= Stimulus/Response #1

= Stimulus/Response #2

= Stimulus/Response #3 if applicable

Note 1:

If S0 is '1', PWR_EN is enabled, and VS is not present, the ADET_PIN bit will cycle if the current draw

exceeds the current capacity of the bypass switch.

The CHG_ACT bit does not indicate that a portable device has accepted one of the charger emulation pro-

files. This bit will cycle during the Dedicated Charger Emulation Cycle.

The EM_ACT bit does not indicate that a portable device has accepted one of the emulation profiles. This

bit will cycle during the Dedicated Charger Emulation Cycle.

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