EMC1403 datasheet(39/55 Pages) MICROCHIP

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1°C Temperature Sensor with Beta Compensation

Data Sheet

 2014 Microchip Technology Inc.

DS20005272A-page 39

Bit 2-0 - BETAx[2:0] - These bits always reflect the current beta configuration settings. If autodetection

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

effect. If the autodetection circuitry is disabled, then 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 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 BETAx[2:0] bits should be set to ‘111b’.

6.14

External Diode Ideality Factor Registers

These registers store the ideality factors that are applied to the external diodes. Table 6.18 defines

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

Table 6.16 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

Autodetection

Table 6.17 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

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