emc1413 Standard Microsystems Corp., emc1413 Datasheet - Page 24

• Manufacturer Part Number: emc1413
• Description: 1?c Temperature Sensor With Beta Compensation And Selectable Address
• Manufacturer: Standard Microsystems Corp.

Revision 1.37 (12-23-09)
5.12
5.13
190
191
>= 191.875
i.e. CPU substrate PNP
TEMPERATURE (°C)
substrate transistor
Typical remote
Local Ground
Note 5.1
Note 5.2
Note 5.3
Note 5.4
The EMC1414 supports reading two external diodes on the same set of pins (DP2, DN2). These
diodes are connected as shown in Figure 5.2, "System Diagram for EMC1414". Due to the anti-parallel
connection of these diodes, both diodes will be reverse biased by a V
Because of this reverse bias, only discrete thermal diodes (such as a 2N3904) are recommended to
be placed on these pins.
The EMC1413 can be configured to measure a CPU substrate transistor, a discrete 2N3904 thermal
diode, or an AMD processor diode. The diodes can be connected in a variety of ways as indicated in
Figure 5.6, "Diode Configurations".
The EMC1414 can be configured to measure a CPU substrate transistor, a discrete 2N3904 thermal
diode, or an AMD processor diode on the External Diode 1 channel only. The External Diode 2 and
External Diode 3 channels are configured to measure a pair of discrete anti-parallel diodes (shared on
pins DP2 and DN2). The supported configurations for the external diode channels are shown in
Figure 5.6, "Diode Configurations".
Anti-parallel Diode Connections
External Diode Connections
Table 5.3 EMC1413 and EMC1414 Temperature Data Format (continued)
In default mode, all temperatures < 0°C will be reported as 0°C.
In the extended range, all temperatures < -64°C will be reported as -64°C.
For the default range, all temperatures > +127.875°C will be reported as +127.875°C.
For the extended range, all temperatures > +191.875°C will be reported as +191.875°C.
011 1111 1111
011 1111 1111
011 1111 1111
DN
DP
to
to
DEFAULT RANGE 0°C TO 127°C
Figure 5.6 Diode Configurations
discrete PNP transistor
Typical remote
i.e. 2N3906
DATASHEET
1°C Temperature Sensor with Beta Compensation and Selectable Address
24
DP
DN
to
to
111 1111 0000
111 1111 1000
111 1111 1111
Note 5.4
discrete NPN transistor
EXTENDED RANGE RANGE
Typical remote
i.e. 2N3904
BE
-64°C TO 191°C
voltage (approximately 0.7V).
SMSC EMC1413 / EMC1414
Datasheet
DP
DN
to
to