EMC2103 datasheet(81/85 Pages) MICROCHIP

81 / 85 page

RPM-Based Fan Controller with Hardware Thermal Shutdown

Datasheet

 2013 Microchip Technology Inc.

DS0005250A-page 81

A.2

Example #2

This example uses the RPM based Fan Speed Control Algorithm. The Spin Level (used by the Spin

Up Routine) should be changed to 50% drive for a total Spin Time of 1 second. For all other RPM

configuration settings, the default conditions are used.

For control inputs, it uses the External Diode 1 channel normally, the External Diode 2 channel

normally, and both Pushed Temperature registers in DTS format. The configuration is set as shown in

Table A.5 while Table A.6 shows how the table is loaded.

Note that when using DTS data, the USE_DTS_F1 and / or USE_DTS_F2 bits should be set. The

Pushed Temperature Registers are loaded with the normal DTS values as received by the processor.

When the DTS value is used by the Look Up Table, the value that is stored in the Pushed Temperature

against the Look Up Table thresholds normally. When programming the Look Up Table, it is necessary

to take this translation into account or else incorrect settings may be selected.

Table A.5 Look Up Table Example #2 Configuration

ADDR

SETTING

42h

Fan 1

Configuration

EN_

ALGO

RANGE[1:0]

EDGES[1:0]

UPDATE[2:0]

CBh

101

46h

Fan 1 Spin

Configuration

DRIVE_FAIL_CNT1

[1:0]

NOKICK

SPIN_LVL[2:0]

SPINUP_TIME

[1:0]

0Ah

101

50h

LUT 1

Configuration

USE_DT

S_F1

USE_D

TS_F2

LUT_LO

RPM /

PWM

TEMP3

_CFG

TEMP

3_CFG

E5h

010

Table A.6 Fan Speed Control Table Example #2

FAN

SPEED

STEP #

EXTERNAL

DIODE 1

TEMPERATURE

(CPU)

EXTERNAL

DIODE 2

TEMPERATURE

(GPU)

PUSHED

TEMPERATURE

SETTING (DTS1)

PUSHED

TEMPERATURE

SETTING (DTS2)

TACH

TARGET

135oC65oC50oC40oC

F4h

(2014 RPM)

240oC75oC55oC45oC

C4h

(2508 RPM)

350oC85oC60oC50oC

A0h

(3072 RPM)

460oC90oC65oC55oC

78h

(4096 RPM)

570oC95oC70oC60oC

60h

(5120 RPM)

680oC

100oC75oC65oC

52h

(5994 RPM)

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