Multiple Channel 1°C Temperature Sensor with Beta Compensation
Datasheet
7.6
Limit Registers
Table 7.7 Temperature Limit Registers
ADDR.
R/W
REGISTER
B7
B6
B5
B4
B3
B2
B1
B0
DEFAULT
05h
0Bh
06h
0Ch
07h
Internal Diode
High Limit
55h
(85°C)
R/W
128
64
32
16
8
4
2
1
Internal Diode
Low Limit
00h
(0°C)
R/W
R/W
128
128
64
64
32
32
16
16
8
8
4
4
2
2
1
1
External
Diode High
Limit High
Byte
55h
(85°C)
0Dh
External
Diode High
Limit Low
Byte
13h
R/W
R/W
R/W
0.5
128
0.5
0.25 0.125
-
16
-
-
8
-
-
4
-
-
2
-
-
1
-
00h
08h
0Eh
External
Diode Low
Limit High
Byte
00h
(0°C)
64
32
External
Diode Low
Limit Low
Byte
14h
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.
When the device is in Standby mode, updating the limit registers will have no effect until the next
conversion cycle occurs. This can be initiated via a write to the One Shot Register or by clearing the
RUN / STOP bit in the Configuration Register (see Section 7.4).
7.7
Scratchpad Registers
Table 7.8 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.
Revision 1.41 (02-23-12)
SMSC EMC1412
DATA3S0HEET
SMSC [ SMSC CORPORATION ]
