emc1428 Standard Microsystems Corp., emc1428 Datasheet - Page 36

• Manufacturer Part Number: emc1428
• Description: 1 Degree C Multiple Temperature Sensor With Hw Thermal Shutdown
• Manufacturer: Standard Microsystems Corp.

ADDR
1Dh
Revision 0.68 (07-08-08)
5.11
5.12
ADDR
1Eh
R/W
R/W
Software Thermal Shutdown Configuration Register
Hardware Critical / Thermal Shutdown Limit Register
R/W
R
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 meets or exceeds the THERM Limit, then
the SYS_SHDN pin is asserted. This functionality is in addition to the Hardware Shutdown circuitry.
Bits 7-1 - ExSYS - configures the External Diode X channel to assert the SYS_SHDN pin based on
it’s respective THERM Limit (see
Bit 0 - INTSYS - configures the Internal Diode channel to assert the SYS_SHDN pin based on it’s
respective THERM Limit (see
This read only register returns the Hardware Thermal Shutdown Limit selected by the TRIP_SET
voltage. The data represents the hardware set temperature in °C. See
When the External Diode 1 Temperature meets or exceeds this limit, the SYS_SHDN pin is asserted
and will remain asserted until the External Diode 1 Temperature drops below this limit minus 10°C.
Software Thermal
Configuration
‘0’ (default) - the External Diode X channel is not linked to the SYS_SHDN pin. If the temperature
meets or exceeds it’s THERM Limit, the ExTHERM status bit is set but the SYS_SHDN pin is not
asserted.
‘1’ - the External Diode X channel is linked to the SYS_SHDN pin. If the temperature meets or
exceeds it’s THERM Limit, the ExTHERM 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.
‘0’ (default) - the Internal Diode channel is not linked to the SYS_SHDN pin. If the temperature
meets or 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 meets or
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.
REGISTER
Shutdown
Shutdown Limit
REGISTER
Hardware
Table 5.14 Software Thermal Shutdown Configuration Register
Thermal
Table 5.15 Hardware Thermal Shutdown Limit Register
SYS
B7
E7
B7
-
Section 5.20
SYS
B6
E6
1°C Multiple Temperature Sensor with HW Thermal Shutdown & Hottest of Thermal Zones
Section 5.20
DATASHEET
B6
64
SYS
B5
E5
36
for details on the ITHERM status bit).
B5
32
for details on the ExTHERM status bits).
SYS
B4
E4
B4
16
SYS
B3
E3
B3
8
SYS
B2
E2
B2
4
Table 5.2
SYS
B1
B1
E1
2
for the data format.
B0
1
SYS
INT
B0
SMSC EMC1428
DEFAULT
Datasheet
N/A
DEFAULT
00h