EMC2103-2-AP-TR Standard Microsystems (SMSC), EMC2103-2-AP-TR Datasheet - Page 51

• Manufacturer Part Number: EMC2103-2-AP-TR
• Description: CLOSED LOOP RPM FAN CONTROLLER
• Manufacturer: Standard Microsystems (SMSC)

RPM-Based Fan Controller with HW Thermal Shutdown
Datasheet
SMSC EMC2103
ADDR
6.13
6.13.1
6.14
ADDR
27h
1Fh
24h
25h
26h
R/W
R-C
R/W
R-C
R-C
R-C
R-C
The Error Status Registers report the specific error condition for all measurement channels with limits.
If any bit is set in the High, Low, or Diode Fault Status register, the corresponding High, Low, or Fault
bit is set in the Interrupt Status Register.
Reading the Interrupt Status Register does not clear the Error Status bit. Reading from any Error Status
Register that has bits set will clear the register and the corresponding bit in the Interrupt Status
Register if the error condition has been removed. If the error condition is persistent, reading the Error
Status Registers will have no affect.
Tcrit Status Register
The Tcrit Status Register stores the event that caused the SYS_SHDN pin to be asserted. Each of the
temperature channels must be associated with the SYS_SHDN pin before they can be set (see
Section
below the threshold level however the individual status bit will not be cleared until read.
The Fan Status Register contains the status bits associated with each fan driver.
Bit 7 - WATCH - This bit is asserted ‘1’ if the host has not programmed the fan driver within four (4)
seconds after power up (i.e. the Watchdog Timer has timed out. See
Bit 5 - DRIVE_FAIL - Indicates that the RPM based Fan Speed Control Algorithm cannot drive the Fan
to the desired target setting at maximum drive. This bit can be masked from asserting the ALERT pin.
Error Status Registers
Fan Status Register
‘0’ - The RPM based Fan Speed Control Algorithm can drive Fan to the desired target setting.
‘1’ - The RPM based Fan Speed Control Algorithm cannot drive Fan to the desired target setting
at maximum drive.
REGISTER
Fan Status
High Status
Diode Fault
REGISTER
Tcrit Status
Low Status
Register
6.9). Once the SYS_SHDN# pin is asserted, it will be released when the temperature drops
HWS
WATCH
B7
-
-
-
B7
Table 6.20 Error Status Register
Table 6.21 Fan Status Register
B6
-
-
-
B6
-
DATASHEET
B5
DRIVE
--
-
-
_FAIL
B5
51
B4
-
-
-
B4
-
_TCR
EXT3
EXT3
EXT3
EXT3
_FLT
_LO
_HI
B3
IT
B3
-
B2
_TCR
-
EXT2
EXT2
EXT2
EXT2
_FLT
_LO
_HI
B2
IT
FAN_
SPIN
Section
B1
_TCR
EXT1
EXT1
EXT1
EXT1
_FLT
_LO
_HI
B1
IT
5.9.
STALL
Revision 0.88 (06-30-08)
FAN_
INT_T
INT_L
CRIT
INT_
B0
B0
HI
O
-
DEFAULT
DEFAULT
00h
00h
00h
00h
00h