EMC1402_12 Datasheet, PDF (28/40 Pages) SMSC Corporation – 1°C Temperature Sensor with Beta Compensation

6.6
Limit Registers
1°C Temperature Sensor with Beta Compensation
Datasheet
ADDR.
05h
0Bh
06h
0Ch
07h
0Dh
13h
08h
0Eh
14h
R/W
R/W
Table 6.7 Temperature Limit Registers
REGISTER
B7
B6
B5
B4
B3
Internal Diode
High Limit
128
64
32
16
8
B2 B1
4
2
B0 DEFAULT
1
55h
(85°C)
R/W
Internal Diode
Low Limit
128
64
32
16
8
4
2
1
00h
(0°C)
External
R/W
Diode High
Limit High
128
64
32
16
8
4
2
1
55h
(85°C)
Byte
External
R/W
Diode High
Limit Low
0.5 0.25 0.125
-
-
-
-
-
00h
Byte
External
R/W
Diode Low
Limit High
128 64
32
16
8
4
2
1
00h
(0°C)
Byte
External
R/W
Diode Low
Limit Low
0.5 0.25 0.125 -
-
-
-
-
00h
Byte
6.7
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 affect 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 6.4).
Scratchpad Registers
Table 6.8 Scratchpad Register
ADDR
R/W
REGISTER B7 B6 B5 B4 B3 B2 B1 B0 DEFAULT
11h
R/W
Scratchpad
7
6
5
43 2
1
0
00h
12h
R/W
Scratchpad
7
6
5
43 2
1
0
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 2.0 (08-10-12)
28
DATASHEET
SMSC EMC1402