emc2104 Standard Microsystems Corp., emc2104 Datasheet - Page 82

• Manufacturer Part Number: emc2104
• Description: Emc2104 Dual Rpm-based Pwm Fan Controller With Hardware Thermal Shutdown
• Manufacturer: Standard Microsystems Corp.

ADDR
EFh
ADDR
FCh
Revision 1.74 (05-08-08)
6.42
6.43
R/W
R/W
1
0
0
1
FUN_SEL[1:0]
R/W
R
REGISTER
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).
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.
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.
Software Lock Register
Product Features Register
Software
Lock
‘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.
REGISTER
0
0
1
0
Features
Product
EXTERNAL DIODE 1 MODE
B7
Hardware Thermal / Critical
-
Transistor mode - Beta =
Internal diode linked to
Shutdown circuitry
B7
-
REC = disabled
REC = enabled
Table 6.60 Product Features Register
Diode mode -
Beta = 1111b
Table 6.59 Software Lock Register
Table 6.61 SHDN_SEL Bit Decode
Not used -
automatic
B6
-
B6
-
DATASHEET
Dual RPM-Based PWM Fan Controller with Hardware Thermal Shutdown
B5
B5
-
-
82
B4
-
High range - 92°C to 154°C
B4
TEMPERATURE RANGE
-
CRITICAL / THERMAL
60°C to 122°C
60°C to 122°C
B3
SHUTDOWN
Low Range
Low Range
-
B3
-
B2
-
B2
-
SHDN_SEL[1:0]
B1
TRIP_SET or VIN4
(see
B1
-
TRIP_SET
TRIP_SET
TRIP_SET
B0
VIN4 OR
Section
SMSC EMC2104
LOCK
B0
Datasheet
DEFAULT
6.1.2)
00h
DEFAULT
00h