emc2105 Standard Microsystems Corp., emc2105 Datasheet - Page 54

• Manufacturer Part Number: emc2105
• Description: Emc2105 Rpm-based High Side Fan Controller With Hardware Thermal Shutdown
• Manufacturer: Standard Microsystems Corp.

ADDR
1Fh
24h
25h
26h
APPLICATION NOTE: If any of the External Diode 1, 2, or 3 channels are configured as a voltage input and
Revision 1.74 (05-08-08)
6.13
R/W
R-C
R-C
R-C
R-C
Bit 6 - TSD - This bit is set to ‘1’ if the internal Thermal Shutdown (TSD) circuit trips indicating that the
die temperature has exceeded its threshold. When this bit is set, it will not cause the ALERT# pin to
be asserted however will coincide with the SYS_SHDN# pin being asserted. This bit is cleared when
the register is read and the error condition has been removed.
Bit 5 - TCRIT - This bit is set to ‘1’ whenever the any bit in the Tcrit Status Register is set. This bit is
automatically cleared when the Tcrit Status Register is cleared.
Bit 4 - GPIO - This bit is set to ‘1’ if any of the bits in the GPIO Status Registers are set.
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.
If any of the External Diode 1, External Diode 2, or External Diode 3 channels are configured as a
voltage input, then the corresponding temperature channel status bit will be set if the measured voltage
exceeds the high limit or falls below the low limit. In this condition, a diode fault will be ignored.
Error Status Registers
High Status
Diode Fault
REGISTER
Tcrit Status
Low Status
thermistor or other voltage source is used on the corresponding pins at device power up,
then the corresponding diode fault status bits will be set. The status bits should be cleared
prior to enabling the interrupts to avoid erroneous alert conditions.
HWS
B7
-
-
-
Table 6.18 Error Status Register
B6
-
-
-
-
DATASHEET
VOLT
VOLT
4_LO
4_HI
B5
RPM-Based High Side Fan Controller with Hardware Thermal Shutdown
-
-
54
EXT4_
EXT4_
EXT4_
EXT4_
CRIT
FLT
LO
B4
HI
EXT3_
EXT3_
EXT3_
EXT3_
CRIT
FLT
B3
LO
HI
EXT2_
EXT2_
EXT2_
EXT2_
CRIT
FLT
B2
LO
HI
_CRIT
EXT1
EXT1
EXT1
EXT1
_FLT
_LO
_HI
B1
SMSC EMC2105
INT_L
CRIT
INT_
INT_
B0
HI
O
-
Datasheet
DEFAULT
00h
00h
00h
00h