EMC1422 SMSC Corporation, EMC1422 Datasheet - Page 30

• Manufacturer Part Number: EMC1422
• Description: 1C Temperature Sensor
• Manufacturer: SMSC Corporation

ADDR.
Revision 1.16 (03-15-07)
6.8
6.9
6.10
1Dh
ADDR.
ADDR.
1Bh
19h
20h
21h
R/W
R/W
Therm Limit Registers
External Diode Fault Register
Software Thermal Shutdown Configuration Register
R/W
R-C
R/W
R/W
R/W
R/W
The External Diode Fault Register indicates which of the external diodes caused the FAULT bit in the
Status Register to be set. This register is cleared when it is read.
Bit 1 - FLT - This bit is set if the External Diode channel reported a diode fault.
The Software Thermal Shutdown Configuration Register controls whether any of the software channels
will assert the SYS_SHDN pin. If a channel is enabled, the temperature is compared against the
corresponding THERM Limit. If the measured temperature exceeds the THERM Limit, then the
SYS_SHDN pin is asserted. This functionality is in addition to the Hardware Shutdown circuitry.
Bit 1 - EXTSYS - configures the External Diode channel to assert the SYS_SHDN pin based on the
THERM Limit.
Configuration
‘0’ (default) - the External Diode channel is not linked to the SYS_SHDN pin. If the temperature
exceeds the THERM Limit, the ETHERM status bit is set but the SYS_SHDN pin is not asserted.
‘1’ - the External Diode channel is linked to the SYS_SHDN pin. If the temperature exceeds the
THERM Limit, the ETHERM status bit is set and the SYS_SHDN pin is asserted. It will remain
asserted until the temperature drops below the THERM Limit minus the THERM Hysteresis.
REGISTER
Shutdown
Software
Thermal
REGISTER
Diode Fault
Diode THERM
Internal Diode
THERM Limit
External
REGISTER
Hysteresis
Table 6.11 Software Thermal Shutdown Configuration Register
External
THERM
Limit
B7
-
Table 6.10 External Diode Fault Register
B7
-
128
128
128
Table 6.9 Therm Limit Registers
B7
B6
-
B6
-
DATASHEET
B6
64
64
64
B5
-
B5
-
30
B5
32
32
32
B4
-
B4
1°C Temperature Sensor with Hardware Thermal Shutdown
-
B4
16
16
16
B3
-
B3
-
B3
8
8
8
B2
-
B2
-
B2
4
4
4
EXTSYS
B1
B1
FLT
2
2
2
B1
B0
INTSYS
1
1
1
B0
B0
-
SMSC EMC1422
DEFAULT
DEFAULT
(85°C)
(85°C)
(10°C)
Datasheet
DEFAULT
0Ah
55h
55h
00h
00h