UCS1002-1 Datasheet, PDF (73/116 Pages) SMSC Corporation – Programmable USB Port Power Controller with Charger Emulation

Programmable USB Port Power Controller with Charger Emulation
Datasheet
10.3 Status Registers
Table 10.4 Status Registers
ADDR R/W REGISTER
B7
B6
B5
0Fh
R
Other
-
Status
-
ALERT
_PIN
10h
See
Text
Interrupt
Status
ERR
DISCH
ARGE_
ERR
RESET
11h R / R-C General RATION
-
-
Status
12h
R
Profile
NO_ HS
-
-
Status 1
13h
R
Profile
-
Status 2
LG7
LG6
14h
R
Pin Status
-
PWR_ M2_
EN_PI
PIN
N
B4
ADET_
PIN
MIN_
KEEP_
OUT
CC_
MODE
VS_LO
W
LG5
M1_
PIN
B3
CHG
_ACT
TSD
TREG
CUST
LG4
EM_
EN_
PIN
B2
B1
B0
DEFAULT
EM
EM_STEP[1:0]
00h
_ACT
OVER BACK_ OVER 00h
_VOLT VOLT _LIM
LOW_ REM ATT
00h
CUR
DCP
CDP
PT
00h
LG3
LG2
LG1
00h
SEL_P PWR_STATE
00h
IN
[1:0]
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 > I_{BUS_CHG} and cleared when IBUS <
I_{BUS_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
SMSC UCS1002
73
DATASHEET
Revision 1.4 (07-16-13)