Dual RPM-Based PWM Fan Controller with Hardware Thermal Shutdown
Datasheet
If any bit in this register is set, then the GPIO status bit will be set.
Bit 2 - 0 - GPIOx_STS - Indicates that the GPIOx pin has changed states from a ‘0’ to a ‘1’ or a ‘1’ to
a ‘0’ (when configured as a GPIO input).
6.42
Software Lock Register
Table 6.59 Software Lock Register
ADDR
R/W
R/W
REGISTER
B7
B6
B5
B4
B3
B2
B1
B0
DEFAULT
Software
Lock
EFh
-
-
-
-
-
-
-
LOCK
00h
The Software Lock Register controls the software locking of critical registers. This register is software
locked.
Bit 0 - LOCK - this bit acts on all registers that are designated SWL. When this bit is set, the locked
registers become read only and cannot be updated.
‘0’ (default) - all SWL registers can be updated normally.
‘1’ - all SWL registers cannot be updated and a hard-reset is required to unlock them.
6.43
Product Features Register
Table 6.60 Product Features Register
ADDR
FCh
R/W
REGISTER
B7
B6
B5
B4
B3
B2
B1
B0
DEFAULT
Product
Features
R
-
-
-
-
-
-
SHDN_SEL[1:0]
00h
The Product Features Register indicates which pin selected functionality is enabled.
Bit 1 - 0 - SHDN_SEL[1:0] - Indicates what the detected pin state of the SHDN_SEL pin was and which
functions are enabled.
Table 6.61 SHDN_SEL Bit Decode
FUN_SEL[1:0]
CRITICAL / THERMAL
SHUTDOWN
VIN4 OR
TRIP_SET
1
0
EXTERNAL DIODE 1 MODE
TEMPERATURE RANGE
Transistor mode - Beta =
automatic
0
0
0
High range - 92°C to 154°C
TRIP_SET
TRIP_SET
REC = enabled
Diode mode -
Beta = 1111b
REC = disabled
Low Range
60°C to 122°C
1
0
Not used -
Internal diode linked to
Hardware Thermal / Critical
Shutdown circuitry
Low Range
60°C to 122°C
TRIP_SET or VIN4
(see Section 6.1.2)
1
Revision 1.74 (05-08-08)
SMSC EMC2104
DATA8S2HEET
SMSC [ SMSC CORPORATION ]
