EMC1402-2-ACZL-TR View Datasheet(PDF) - SMSC -> Microchip

Part Name

Description

MFG CO.

EMC1402-2-ACZL-TR

1°C Temperature Sensor with Beta Compensation

SMSC -> Microchip 

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1°C Temperature Sensor with Beta Compensation

Datasheet

Care should be taken when setting the BETA[2:0] bits when the autodetection circuitry is disabled. If

the Beta Compensation factor is set at a beta value that is higher than the transistor beta, then 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), then the BETA[2:0] bits should be set to ‘111b’.

HEX

0h

1h

2h

3h

4h

5h

6h

7h

8h - Fh

Table 6.15 CPU Beta Values

BETA[2:0]

ENABLE

2

1

0

0

0

0

0

0

0

0

1

0

0

1

0

1

0

0

1

0

0

1

1

0

1

1

1

X

X

0

MINIMUM BETA

0

0.11

1

0.18

0

0.25

1

0.33

0

0.43

1

1.00

0

2.33

1

Disabled

X

Autodetection

6.13 External Diode Ideality Factor Registers

ADDR.

R/W

27h

R/W

Table 6.16 Ideality Configuration Registers

REGISTER

B7

B6

B5

B4

B3

B2

B1

B0

DEFAULT

External

Diode 1

Ideality

-

-

IDEALITY[5:0]

12h

Factor

These registers store the ideality factors that are applied to the external diodes. Table 6.17 defines

each setting and the corresponding ideality factor. Beta Compensation and Resistance Error Correction

automatically correct for most diode ideality errors, therefore it is not recommended that these settings

be updated without consulting SMSC.

SETTING

08h

09h

0Ah

0Bh

Table 6.17 Ideality Factor Look-Up Table (Diode Model)

FACTOR

0.9949

0.9962

0.9975

0.9988

SETTING

18h

19h

1Ah

1Bh

FACTOR

1.0159

1.0172

1.0185

1.0200

SETTING

28h

29h

2Ah

2Bh

FACTOR

1.0371

1.0384

1.0397

1.0410

Revision 2.0 (08-10-12)

32

DATASHEET

SMSC EMC1402

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