EMC2103 Standard Microsystems Corporation, EMC2103 Datasheet - Page 50

• Manufacturer Part Number: EMC2103
• Description: Rpm-based Fan Controller with HW Thermal Shutdown
• Manufacturer: Standard Microsystems Corporation

Revision 0.85 (01-29-08)
6.13
6.13.1
ADDR
1Fh
24h
25h
26h
R/W
R-C
R-C
R-C
R-C
The Interrupt Status Register reports the operating condition of the EMC2103. If any of the bits are set
to a logic ‘1’ (other than HWS) then the ALERT pin will be asserted low if the corresponding channel
is enabled. Reading from the status register clears all status bits if the error conditions is removed. If
there are no set status bits, then the ALERT pin will be released.
The bits that cause the ALERT pin to be asserted can be masked based on the channel they are
associated with unless stated otherwise.
Bit 5 - TCRIT - This bit is set to ‘1’ if any bit in the Tcrit Status Register is set. This bit is automatically
cleared when the Tcrit Status Register is read and the bits are cleared.
Bit 4 - GPIO (EMC2103-2 only) - This bit is set to ‘1’ if any bit in the GPIO Status Register is set. This
bit is automatically cleared when the GPIO Status Register is read.
Bit 3 - FAN - This bit is set to ‘1’ if any bit in the Fan Status Register is set. This bit is automatically
cleared when the Fan Status Register is read and the bits are cleared.
Bit 2 - HIGH - This bit is set to ‘1’ if any bit in the High Status Register is set. This bit is automatically
cleared when the High Status Register is read and the bits are cleared.
Bit 1- LOW - This bit is set to ‘1’ if any bit in the Low Status Register is set. This bit is automatically
cleared when the Low Status Register is read and the bits are cleared.
Bit 0 - FAULT - This bit is set to ‘1’ if any bit in the Diode Fault Register is set. This bit is automatically
cleared when the Diode Fault Register is read and the bits are cleared.
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.
Error Status Registers
High Status
Diode Fault
REGISTER
Tcrit Status
Low Status
6.9). Once the SYS_SHDN# pin is asserted, it will be released when the temperature drops
HWS
B7
-
-
-
Table 6.19 Error Status Register
B6
-
-
-
DATASHEET
B5
--
-
-
50
B4
-
-
-
RPM-Based Fan Controller with HW Thermal Shutdown
_TCR
EXT3
EXT3
EXT3
EXT3
_FLT
_LO
_HI
B3
IT
_TCR
EXT2
EXT2
EXT2
EXT2
_FLT
_LO
_HI
B2
IT
_TCR
EXT1
EXT1
EXT1
EXT1
_FLT
_LO
_HI
B1
IT
INT_T
INT_L
CRIT
INT_
B0
HI
O
-
SMSC EMC2103
DEFAULT
Datasheet
00h
00h
00h
00h