1°C Triple Temperature Sensor with Beta Compensation and Hotter of Two Zones
Datasheet
IHIGH
ILOW
Substrate
PNP
DP
Anti-
Aliasing
Filter
Resistance
Error
Correction
ΔΣ
ADC
DN
Figure 3.3 Block Diagram of Temperature Monitoring Circuit
Figure 3.3 shows a block diagram of the temperature measurement circuit. The negative terminal for
the remote temperature diode, DN, is internally biased with a forward diode voltage referenced to
ground.
The EMC1043-1, EMC1043-2, EMC1043-3 and EMC1043-4 are designed to work with the PNP
substrate transistor in a CPU. The External Diode 2 channel in the EMC1043-5 has beta compensation
disabled by default.
The external diodes in all versions of the EMC1043 are compatible with a broad range of thermal
diodes that may be connected as shown in Figure 3.4 (see Section 4.8 for programming details when
using diode-connected transistors as the external diodes).
to
to
to
DP
DP
DP
to
DN
to
to
DN
DN
Local Ground
Typical remote
substrate transistor
i.e. CPU substrate PNP
Typical remote
discrete PNP transistor
i.e. 2N3906
Typical remote
discrete NPN transistor
i.e. 2N3904
Figure 3.4 External Diode Configurations
Revision 1.37 (09-05-06)
SMSC EMC1043
DATA1S4HEET
SMSC [ SMSC CORPORATION ]
