emc2101 Standard Microsystems Corp., emc2101 Datasheet - Page 22

• Manufacturer Part Number: emc2101
• Description: Emc2101 Fan Control With 1?c Accurate Temperature Monitoring
• Manufacturer: Standard Microsystems Corp.

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Revision 2.53 (02-19-08)
5.5.1
i.e. CPU substrate PNP
substrate transistor
substrate
Typical remote
Local Ground
CPU
PNP
Figure 5.3
incorporates a delta-sigma analog to digital converter that integrates the temperature diode voltage
from multiple bias currents.
The external temperature diodes can be connected as shown in
Temperature Measurement Results and Data
The results of the internal and external temperature measurements are stored in the internal and
external temperature registers respectively. These are then compared with the values stored in the
High Limit Registers. The internal temperature measurements are stored in 8-bit format while the
external temperature measurements are stored in 11-bit format.
shows a block diagram of the temperature measurement circuit. As shown, the EMC2101
Figure 5.3 Block Diagram of Temperature Monitoring Circuit
DN
DP
to
to
Figure 5.4 External Diode configurations
discrete PNP transistor
Resistance
Correction
Error
Typical remote
i.e. 2N3906
DATASHEET
I
HIGH
22
SMBus Fan Control with 1°C Accurate Temperature Monitoring
Sampler
Filter &
Input
I
LOW
DN
DP
to
to
discrete NPN transistor
Figure
Typical remote
i.e. 2N3904
ΔΣ
5.4.
ADC
SMSC EMC2101
Datasheet
DN
DP
to
to