EMC1422 SMSC Corporation, EMC1422 Datasheet - Page 33

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

ADDR.
1°C Temperature Sensor with Hardware Thermal Shutdown
Datasheet
SMSC EMC1422
6.14
35h
2
0
0
0
1
R/W
R-C
High Limit Status Register
If the temperature drops below the THERM limit or Hardware Thermal Shutdown Limit, then the
counter is reset. If the programmed number of consecutive measurements exceed the THERM Limit
or Hardware Thermal Shutdown Limit, and the appropriate channel is linked to the SYS_SHDN pin,
then the SYS_SHDN pin will be asserted low.
Once the SYS_SHDN pin is asserted, the consecutive THERM counter will not reset until the
corresponding temperature drops below the appropriate limit minus the corresponding hysteresis.
The bits are decoded as shown in
conversions.
Bits 3-1 - CALRT[2:0] - Determine the number of consecutive measurements that must have an out of
limit condition or diode fault before the ALERT pin is asserted. All temperature channels use this value
to set the respective counters. The bits are decoded as shown in
consecutive out of limit conversion.
The High Limit Status Register contains the status bits that are set when a temperature channel high
limit is exceeded. If any of these bits are set, then the HIGH status bit in the Status Register is set.
Reading from the High Limit Status Register will clear all bits if. Reading from the register will also
clear the HIGH status bit in the Status Register.
The ALERT pin will be set if the programmed number of consecutive alert counts have been met and
any of these status bits are set.
The status bits will remain set until read unless the ALERT pin is configured as a comparator output
(see
Bit 1 - EHIGH - This bit is set when the External Diode channel exceeds its programmed high limit.
Bit 0 - IHIGH - This bit is set when the Internal Diode channel exceeds its programmed high limit.
REGISTER
High Limit
Section
Status
1
0
0
1
1
5.3.2).
B7
-
Table 6.15 Consecutive Alert / THERM Settings
Table 6.16 High Limit Status Register
B6
-
0
0
1
1
1
DATASHEET
B5
-
Table
33
6.15. The default setting is 4 consecutive out of limit
B4
-
NUMBER OF CONSECUTIVE OUT OF LIMIT
B3
-
(default for CTHRM[2:0])
(default for CALRT[2:0])
MEASUREMENTS
B2
-
Table
1
2
3
4
6.15. The default setting is 1
EHIGH
B1
Revision 1.16 (03-15-07)
IHIGH
B0
DEFAULT
00h