UCS1002-1 datasheet(73/116 Pages) MICROCHIP

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Programmable USB Port Power Controller with Charger Emulation

Datasheet

SMSC UCS1002

Revision 1.4 (07-16-13)

DATASHEET

10.3

Status Registers

The Status registers store bits that indicate error conditions as well as Attach Detection and Removal

Detection. Unless otherwise noted, these bits will operate as described when the UCS1002 is

operating in Stand-alone mode.

10.3.1

Other Status - 0Fh

Bit 5 - ALERT_PIN - Reflects the status of the ALERT# pin. When set, indicates that the ALERT# pin

is asserted low. This bit is set and cleared as the ALERT# pin changes states.

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.

APPLICATION NOTE: 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.

Bit 3 - CHG_ACT - This bit is automatically set when IBUS > IBUS_CHG and cleared when IBUS <

IBUS_CHG.

APPLICATION NOTE: The CHG_ACT bit does not indicate that a portable device has accepted one of the charger

emulation profiles. This bit will cycle during the Dedicated Charger Emulation Cycle.

Bit 2 - EM_ACT - Indicates that the UCS1002 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 - 30h"). This bit is set and cleared automatically.

APPLICATION NOTE: 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.

Bits 1 - 0 - EM_STEP[1:0] - Indicates which stimulus / response pair is currently being applied by the

charger emulation profile as shown in Table 10.5. These bits are set and cleared automatically. Note

Table 10.4 Status Registers

ADDR

R/W

DEFAULT

0Fh

Other

Status

ALERT

_PIN

ADET_

CHG

_ACT

EM_STEP[1:0]

00h

10h

See

Text

Interrupt

Status

ERR

DISCH

ARGE_

ERR

RESET

MIN_

KEEP_

OUT

TSD

OVER

_VOLT

BACK_

VOLT

OVER

_LIM

00h

11h

R / R-C

General

Status

RATION

CC_

MODE

TREG

LOW_

CUR

REM

ATT

00h

12h

Profile

Status 1

NO_ HS

VS_LO

CUST

DCP

CDP

00h

13h

Profile

Status 2

LG7

LG6

LG5

LG4

LG3

LG2

LG1

00h

14h

Pin Status

PWR_

EN_PI

M2_

M1_

EM_

EN_

SEL_P

PWR_STATE

[1:0]

00h

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