EMC1413 datasheet(25/52 Pages) SMSC

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Multiple Channel 1°C Temperature Sensors with Beta Compensation

Datasheet

SMSC EMC1413 / EMC1414

Revision 1.41 (02-23-12)

DATASHEET

6.9

Anti-parallel Diode Connections

The EMC1414 supports reading two external diodes on the same set of pins (DP2, DN2). These

diodes are connected as shown in Figure 6.1. Due to the anti-parallel connection of these diodes, both

diodes will be reverse biased by a VBE voltage (approximately 0.7V). Because of this reverse bias,

only discrete thermal diodes (such as a 2N3904) are recommended to be placed on these pins.

6.10

External Diode Connections

The EMC1413 / 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. For the

EMC1414 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 6.5.

Figure 6.5 Diode Configurations

Local

Ground

DP1

Typical remote

substrate transistor

e.g. CPU substrate

PNP

Typical remote

discrete NPN transistor

e.g. 2N3904

DN1

DP1

DN1

to DP2 / DN3

to DN2 / DP3

Anti-parallel connected

discrete NPN transistors

e.g. 2N3904

EMC1413 Datenblatt(PDF) 25 Page - SMSC Corporation