EMC1413 datasheet(38/52 Pages) SMSC

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Multiple Channel 1°C Temperature Sensors with Beta Compensation

Datasheet

Revision 1.41 (02-23-12)

SMSC EMC1413 / EMC1414

DATASHEET

EMC1413. This is the default for EMC1414 for External Diode 1 only; it is disabled and cannot be

enabled for External Diode 2 or 3.

Bit 2-0 - BETAX[2:0] - These bits always reflect the current beta configuration settings. If auto-detection

circuitry is enabled, these bits will be updated automatically and writing to these bits will have no effect.

If the auto-detection circuitry is disabled, these bits will determine the beta configuration setting that is

used for their respective channels.

Care should be taken when setting the BETAX[2:0] bits when the auto-detection circuitry is disabled.

If the Beta Compensation factor is set at a beta value that is higher than the transistor beta, the circuit

may introduce measurement errors. When measuring a discrete thermal diode (such as 2N3904) or a

CPU diode that functions like a discrete thermal diode (such as an AMD processor diode), the

BETAX[2:0] bits should be set to ‘111b’.

7.14

External Diode Ideality Factor Registers

Table 7.16 CPU Beta Values

HEX

ENABLEX

BETAX[2:0]

MINIMUM BETA

0.11

0.18

0.25

0.33

0.43

1.00

2.33

Disabled

8h - Fh

Auto-detection

Table 7.17 Ideality Configuration Registers

ADDR.

R/W

DEFAULT

27h

R/W

External

Diode 1

Ideality

Factor

IDEALITY1[5:0]

12h

28h

R/W

External

Diode 2

Ideality

Factor

IDEALITY2[5:0]

12h

31h

R/W

External

Diode 3

Ideality

Factor

IDEALITY3[5:0]

12h

EMC1413 Datenblatt(PDF) 38 Page - SMSC Corporation

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