1°C Temperature Sensor with Hardware Thermal Shutdown
Datasheet
The status bits will remain set until read unless the ALERT pin is configured as a comparator output
(see Section 5.3.2).
Bit 1 - ELOW - This bit is set when the External Diode channel drops below its programmed low limit.
Bit 0 - ILOW - This bit is set when the Internal Diode channel drops below its programmed low limit.
6.16
THERM Limit Status Register
Table 6.18 THERM Limit Status Register
ADDR.
R/W
REGISTER
B7
B6
B5
B4
B3
B2
B1
B0
DEFAULT
THERM
Limit Status
-
-
E
37h
R-C
-
-
-
-
THERM
ITHERM
00h
The THERM Limit Status Register contains the status bits that are set when a temperature channel
THERM Limit is exceeded. If any of these bits are set, then the THERM status bit in the Status Register
is set. Reading from the THERM Limit Status Register will not clear the status bits. Once the
temperature drops below the THERM Limit minus the THERM Hysteresis, the corresponding status
bits will be automatically cleared. The THERM bit in the Status Register will be cleared when all
individual channel THERM bits are cleared.
Bit 1 - ETHERM - This bit is set when the External Diode channel exceeds it’s programmed THERM
limit.
Bit 0- ITHERM - This bit is set when the Internal Diode channel exceeds it’s programmed THERM limit.
6.17
Filter Control Register
Table 6.19 Filter Configuration Register
ADDR.
40h
R/W
REGISTER
B7
B6
B5
B4
B3
B2
B1
B0
DEFAULT
R/W
Filter Control
-
-
-
-
-
-
FILTER[1:0]
00h
The Filter Configuration Register controls the digital filter on the External Diode channel.
Bits 1-0 - FILTER[1:0] - Control the level of digital filtering that is applied to the External Diode
temperature measurements as shown in Table 6.20. See Figure 5.4and Figure 5.5 for examples on the
filter behavior.
Table 6.20 Filter Settings
FILTER[1:0]
1
0
AVERAGING
0
0
1
1
0
1
0
1
Disabled (default)
Level 1
Level 1
Level 2
Revision 1.24 (02-05-08)
SMSC EMC1422
DATA3S4HEET
SMSC [ SMSC CORPORATION ]
