EMC2113 datasheet(84/88 Pages) MICROCHIP

84 / 88 page

RPM-Based Fan Controller with Multiple Temperature Zones & Hardware Thermal Shutdown

Datasheet

DS20005251A-page 84

 2013 Microchip Technology Inc.

A.3

Example #3

This example uses the RPM-based Fan Speed Control Algorithm with default settings.

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

normally, the PWM input instead of External Diode 3, and the Internal Diode. The configuration is set

as shown in Table A.8 while Table A.9 shows how the table is loaded.

A.3.1

LUT COnfiguration Bit Description

Bit 7 - USE_DTS_F1 = ‘0b’ tells the circuitry that the Forced Temperature 1 register data is not in DTS

format.

Bit 6 - USE_DTS_F2 = ‘0b’ tells the circuitry that the Forced Temperature 2 register data is not in DTS

format.

Bit 5 - LUT_LOCK = ‘1b’ tells the circuitry that the LUT is programmed and is active. This bit must be

set for the LUT to function.

Bit 4 - RPM_PWM = ‘0b’ tells the LUT circuitry that the FSC algorithm is active and that the LUT values

are TACH Target settings. This is the default setting.

Bit 3 - PUSH1_CFG = ‘1b’ tells the Look Up Table to reference the PWM Input Duty Cycle instead of

the Pushed Temperature 1 register.

Bit 2 - TEMP1_CFG = ‘0b’ tells the LUT to reference the External Diode 1 data instead of Forced

Temperature 1 data. This is the default setting.

Table A.7 Fan Speed Determination for Example #2 (using settings in Table A.6)

EXTERNAL

DIODE 1

TEMPERATURE

(CPU)

EXTERNAL

DIODE 2

TEMPERATURE

(GPU)

PUSHED

TEMPERATURE

(DTS1)

PUSHED

TEMPERATURE

(DTS2)

PWM RESULT

Example 1:

75°C

35°C

(translated as 65°C)

50°C

(translated as 50°C)

52h (2997 RPM) -

CPU requires highest

target

Example 2:

75°C

90°C

15°C

(translated as

85°C)

20°C

(translated as 80°C)

29h (5994 RPM) -

DTS1 requires

highest target

Example 3:

75°C

97.25°C

30°C

(translated as 70°C)

5°C

(translated as

95°C)

31h (5016 RPM) -

DTS2 requires

highest target

Table A.8 Look Up Table Example #3 Configuration

ADDR

SETTING

90h

LUT

Configuration

USE_

DTS_F1

USE_

DTS_F2

LUT_

LOCK

RPM /

PWM

PUSH1_

CFG

TEMP1_

CFG

TEMP3_

CFG

TEMP4_

CFG

2Ah

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