EMC2102 datasheet(39/52 Pages) SMSC

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RPM-Based Fan Controller with HW Thermal Shutdown

Datasheet

SMSC EMC2102

Revision 1.95 (10-19-06)

DATASHEET

When the Beta Compensation circuitry is disabled, the diode channels will function with default current

levels and will not automatically adjust for beta variation. This mode is used when measuring a discrete

2N3904 transistor or AMD thermal diode.

All of the Beta Configuration Registers are Software Locked.

6.10

REC Configuration Register

The REC Configuration Register determines whether Resistance Error Correction is used for each

external diode channel. The REC Configuration Register is software locked.

If either the External Diode 1 channel or External Diode 3 channel is selected by the SHDN_SEL pin

to be the hardware shutdown input channel (see Table 5.4), then the corresponding RECx bit will be

locked. Writing to the bit will have no affect and reading from it will always report the current setting.

Bit 2 - REC3 - Controls the Resistive Error Correction functionality of External Diode 3

‘0’ - the REC functionality for External Diode 3 is disabled

‘1’ (default) - the REC functionality for External Diode 3 is enabled.

Bit 1 - REC2 - Controls the Resistive Error Correction functionality of External Diode 1

‘0’ - the REC functionality for External Diode 2 is disabled

‘1’ (default) - the REC functionality for External Diode 2 is enabled.

Bit 0 - REC1 - Controls the Resistive Error Correction functionality of External Diode 1

‘0’ - the REC functionality for External Diode 1 is disabled

‘1’ (default) - the REC functionality for External Diode 1 is enabled.

Table 6.13 Beta Compensation Look Up Table

BETAX[2:0]

MINIMUM BETA

0.1111

0.1765

0.25

0.333 (default)

0.4285

1.0

2.333

Disabled

Table 6.14 REC Configuration Register

ADDRESS

DEFAULT

32h

REC

Configuration

-REC3

REC2

REC1

07h

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