1°C Triple Temperature Sensor with Beta Compensation and Hotter of Two Zones
Datasheet
4.8
Beta Configuration Registers (29h - 2Ah)
Table 4.9 Beta Configuration Registers
ADDR
REGISTER
B7
B6
B5
B4
B3
B2
B1
B0
DEFAULT
29h
2Ah
Diode 1 Beta
Configuration
-
-
-
-
-
-
-
-
-
-
BETA<2:0>
03h
Diode 2 Beta
Configuration
BETA<2:0>
03h
(07h for
EMC1043-
5)
The Beta Configuration Registers have a factory programmed power-on default based on the beta of
the PNP substrate transistor that is being monitored as the external diode. The default value of the
Diode 2 Beta Configuration Register of EMC1043-5 is 07h (disabled).
The beta compensation circuit is able to compensate for beta variation within a given range. The beta
configuration register is configured to the proper range to match the CPU to be monitored. The beta
values should be set so that the minimum expected beta is not below the threshold indicated in
Table 4.10. Beta compensation is activated if the BETA<2:0> bits are set to any value other than 07h.
When using diode-connected transistors (such as the 2N3904) or CPUs that implement the thermal
diode as a two-terminal diode, the Beta Configuration Register should be set to 07h.
Table 4.10 Beta Configuration Look Up Table
BETA<2:0>
2
1
0
MINIMUM BETA
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
0.11
0.18
0.25
0.33 (default)
0.43
1.00
2.33
Disabled
SMSC EMC1043
Revision 1.37 (09-05-06)
DATA2S3HEET
SMSC [ SMSC CORPORATION ]
