EMC2113 datasheet(85/88 Pages) MICROCHIP

85 / 88 page

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

Datasheet

 2013 Microchip Technology Inc.

DS20005251A-page 85

Bit 1 - TEMP3_CFG = ‘1b’ tells the Look Up Table to reference Pushed Temperature 1 instead of

External Diode 3, except that PUSH1_CFG re-directs the logic to reference the PWM Input Duty Cycle

Bit 0 - TEMP4_CFG = ‘0b’ tells the LUT to reference the Internal Diode data instead of Forced

Temperature 2 data. This is the default setting.

Note: The values shown in Table A.9 are example settings. All the cells in the look-up table are

programmable via SMBus.

Table A.9 Fan Speed Control Table Example #3

FAN

SPEED

STEP #

EXTERNAL

DIODE 1

TEMPERATURE

(CPU)

EXTERNAL

DIODE 2

TEMPERATURE

(GPU)

PWM DUTY

CYCLE

INTERNAL DIODE

TACH

TARGET

135oC65oC

20% Duty Cycle

(1Ah)

40oC

EFh

(1028 RPM)

240oC75oC

30% Duty Cycle

(26h)

45oC

A3h

(1508 RPM)

350oC85oC

40% Duty Cycle

(33h)

50oC

7Ah

(2014 RPM)

460oC90oC

50% Duty Cycle

(40h)

55oC

62h

(2508 RPM)

570oC95oC

60% Duty Cycle

(4Dh)

60oC

52h

(2997 RPM)

680oC

100oC

70% Duty Cycle

(5Ah)

65oC

3Dh

(4029 RPM)

790oC

105oC

80% Duty Cycle

(66h)

80oC

31h

(5016 RPM)

100oC110oC

90% Duty Cycle

(73h)

100oC

29h

(5994 RPM)

Table A.10 Fan Speed Determination for Example #2 (using settings in Table A.9)

EXTERNAL

DIODE 1

TEMPERATURE

(CPU)

EXTERNAL

DIODE 2

TEMPERATURE

(GPU)

PWM INPUT DUTY

CYCLE

INTERNAL DIODE

PWM RESULT

Example 1:

75°C

45% Duty Cycle

50°C

52h (2997 RPM) -

CPU requires highest

target

Example 2:

75°C

90°C

85% Duty Cycle

70°C

31h (5016 RPM) -

PWM requires highest

target

Example 3:

75°C

97.25°C

75% Duty Cycle

95°C

31h (5016 RPM) -

DTS2 requires

highest target

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