EMC1422-2-ACZL SMSC, EMC1422-2-ACZL Datasheet - Page 30

• Manufacturer Part Number: EMC1422-2-ACZL
• Description: Board Mount Temperature Sensors DUAL TEMP SNSR
• Manufacturer: SMSC

Specifications of EMC1422-2-ACZL

• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

ADDR.
1Dh
Revision 1.36 (07-02-09)
ADDR.
6.9
6.10
1Bh
ADDR.
21h
R/W
R/W
R-C
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.
Bit 0 - INTSYS - configures the Internal Diode channel to assert the SYS_SHDN pin based on it’s
respective THERM Limit.
External Diode Fault Register
Software Thermal Shutdown Configuration Register
Configuration
REGISTER
Shutdown
Software
Thermal
‘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.
‘0’ (default) - the Internal Diode channel is not linked to the SYS_SHDN pin. If the temperature
exceeds it’s THERM Limit, the ITHERM status bit is set but the SYS_SHDN pin is not asserted.
‘1’ - the Internal Diode channel is linked to the SYS_SHDN pin. If the temperature exceeds it’s
THERM Limit, the ITHERM status bit is set and the SYS_SHDN pin is asserted. It will remain
asserted until the temperature drops below it’s THERM Limit minus the THERM Hysteresis.
Diode Fault
REGISTER
External
REGISTER
Hysteresis
Table 6.11 Software Thermal Shutdown Configuration Register
THERM
B7
-
Table 6.9 Therm Limit Registers (continued)
B7
-
Table 6.10 External Diode Fault Register
128
B6
B7
-
B6
-
DATASHEET
B6
64
B5
-
B5
-
30
B5
32
B4
-
B4
-
1°C Temperature Sensor with Hardware Thermal Shutdown
B4
16
B3
-
B3
-
B3
8
B2
-
B2
-
B2
4
EXTSYS
B1
B1
2
FLT
B1
B0
1
INTSYS
B0
-
B0
SMSC EMC1422
DEFAULT
(10°C)
Datasheet
DEFAULT
0Ah
00h
DEFAULT
00h