EMC2103 datasheet(48/85 Pages) MICROCHIP

48 / 85 page

RPM-Based Fan Controller with Hardware Thermal Shutdown

Datasheet

DS0005250A-page 48

 2013 Microchip Technology Inc.

Writing to a read only register will have no affect. The data will be ignored.

Bit 4 - AUTOx - Enables the Automatic Beta detection algorithm for the External Diode X channel.



‘0’ - The Automatic Beta detection algorithm is disabled. The BETAx[3:0] bit settings will be used

to control the beta compensation circuitry. This bit is set to ‘0’ automatically if Beta Compensation

is disabled - see Table 5.1.



‘1’ - The Automatic Beta detection algorithm is enabled. The circuitry will automatically detect the

transistor type and beta values and configure the BETAx[3:0] bits for optimal performance.

Bits 2 - 0 - BETAx[2:0] - hold a value that corresponds to a range of betas that the Beta Compensation

circuitry can compensate for. These three bits will always show the current beta setting used by the

circuitry. If the AUTO bit is set (default), then these bits may be overwritten with every temperature

conversion. If the AUTO bit is not set, then the value of these bits is used to drive the beta

compensation circuitry. In this case, these bits should be set with a value corresponding to the lowest

expected value of beta for the PNP transistor being used as a temperature sensing device.

See Table 6.12 for supported beta ranges. A value of 111b indicates that the beta compensation

circuitry is disabled. In this condition, 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.

If the External Diode 3 channel is enabled, it will always use a beta setting of 111b.

These bits will be set to 111b if Beta Compensation is disabled - see Table 5.1

The Beta Configuration Registers are Software Locked.

6.8

REC Configuration Register

Table 6.12 Beta Compensation Look Up Table

BETAX[2:0]

MINIMUM BETA

210

000

< 0.08

001

< 0.111

010

< 0.176

011

< 0.29

100

< 0.48

101

< 0.9

110

< 2.33

Disabled

Table 6.13 REC Configuration Register

ADDR

R/W

DEFAULT

17h

R/W -

see

Table 5.1

REC

Configuration

REC3

REC2

REC1

0000_01XXb

see

Table 5.1

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