1°C Temperature Sensor with Hardware Thermal Shutdown
Datasheet
Table 6.7 Temperature Limit Registers (continued)
ADDR.
R/W
REGISTER
B7
B6
B5
B4
B3
B2
B1
B0
DEFAULT
07h
0Dh
R/W
External
Diode High
Limit High
Byte
128
64
32
16
8
4
2
1
55h
(85°C)
13h
R/W
R/W
R/W
External
Diode High
Limit Low
Byte
0.5
128
0.5
0.25 0.125
-
16
-
-
8
-
-
4
-
-
2
-
-
1
-
00h
08h
0Eh
External
Diode Low
Limit High
Byte
64
32
00h
(0°C)
14h
External
Diode Low
Limit Low
Byte
0.25 0.125
00h
The device contains both high and low limits for all temperature channels. If the measured temperature
exceeds the high limit, then the corresponding status bit is set and the ALERT pin is asserted.
Likewise, if the measured temperature is less than or equal to the low limit, the corresponding status
bit is set and the ALERT pin is asserted.
The data format for the limits must match the selected data format for the temperature so that if the
extended temperature range is used, the limits must be programmed in the extended data format.
The limit registers with multiple addresses are fully accessible at either address.
6.7
Scratchpad Registers
Table 6.8 Scratchpad Register
ADDR
R/W
REGISTER
B7
B6
B5
B4
B3
B2
B1
B0
DEFAULT
11h
12h
R/W
R/W
Scratchpad
Scratchpad
7
7
6
6
5
5
4
4
3
3
2
2
1
1
0
0
00h
00h
The Scratchpad Registers are Read Write registers that are used for place holders to be software
compatible with legacy programs. Reading from the registers will return what is written to them.
6.8
Therm Limit Registers
Table 6.9 Therm Limit Registers
ADDR.
R/W
REGISTER
B7
B6
B5
B4
B3
B2
B1
B0
DEFAULT
19h
R/W
External
Diode THERM
Limit
128
64
32
16
8
4
2
1
55h
(85°C)
20h
R/W
Internal Diode
THERM Limit
128
64
32
16
8
4
2
1
55h
(85°C)
SMSC EMC1422
Revision 1.24 (02-05-08)
DATA2S9HEET
SMSC [ SMSC CORPORATION ]
