Dual Channel 1°C Temperature Sensor with Beta Compensation and 1.8V SMBus Communications
Datasheet
6.9
Therm Limit Registers
Table 6.9 Therm Limit Registers
ADDR.
R/W
REGISTER
B7
B6
B5
B4
B3
B2
B1
B0
DEFAULT
External
Diode Therm
Limit
55h
(85°C)
19h
R/W
128
64
32
16
8
4
2
1
Internal Diode
Therm Limit
55h
(85°C)
20h
21h
R/W
R/W
128
128
64
64
32
32
16
16
8
8
4
4
2
2
1
1
Therm
Hysteresis
0Ah
(10°C)
The Therm Limit Registers are used to determine whether a critical thermal event has occurred. If the
measured temperature exceeds the Therm Limit, the THERM pin is asserted. The limit setting must
match the chosen data format of the temperature reading registers.
Unlike the ALERT / THERM2 pin, the THERM pin cannot be masked. Additionally, the THERM pin will
be released once the temperature drops below the corresponding threshold minus the Therm
Hysteresis.
6.10
Channel Mask Register 1Fh
Table 6.10 Channel Mask Register
ADDR.
R/W
REGISTER
B7
B6
B5
B4
B3
B2
B1
B0
DEFAULT
Channel
Mask
EXT
MASK
INT
MASK
1Fh
R/W
-
-
-
-
-
-
00h
The Channel Mask Register controls individual channel masking. When a channel is masked, the
ALERT / THERM2 pin will not be asserted when the masked channel reads a diode fault or out of limit
error. The channel mask does not mask the THERM pin.
Bit 1 - EXTMASK - Masks the ALERT / THERM2 pin from asserting when the External Diode channel
is out of limit or reports a diode fault.
‘0’ (default) - The External Diode channel will cause the ALERT / THERM2 pin to be asserted if it
is out of limit or reports a diode fault.
‘1’ - The External Diode channel will not cause the ALERT / THERM2 pin to be asserted if it is out
of limit or reports a diode fault.
Bit 0 - INTMASK - Masks the ALERT / THERM2 pin from asserting when the Internal Diode
temperature is out of limit.
‘0’ (default) - The Internal Diode channel will cause the ALERT / THERM2 pin to be asserted if it
is out of limit.
‘1’ - The Internal Diode channel will not cause the ALERT / THERM2 pin to be asserted if it is out
of limit.
Revision 1.0 (07-11-13)
32
SMSC EMC1182
DATASHEET
SMSC [ SMSC CORPORATION ]
