EMC2113 datasheet(83/88 Pages) MICROCHIP

83 / 88 page

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

Datasheet

 2013 Microchip Technology Inc.

DS20005251A-page 83

Bits 1-0 - SPINUP_TIME[1:0] = ‘10b’ tells the circuitry that if the Spin Up Routine is invoked, it will run

at 100% duty cycle for 250ms and at 40% duty cycle for 750ms for a total spin up time of 1s.

A.2.2

LUT Configuration - Bit Description

7 - USE_DTS_F1 = ‘1b’ tells the circuitry that the data in the Pushed Temperature 1 register is in DTS

format which means that the value in the register is equal to 100C - CPU Temp.

Bit 6 - USE_DTS_F2 = ‘1b’ tells the circuitry that the data in the Pushed Temperature 1 register is in

DTS format which means that the value in the register is equal to 100°C - CPU temp.

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 = ‘0b’ tells the circuitry that the LUT should referenced the Forced Temperature

data instead of the PWM Input Duty Cycle data. This is the default setting.

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

Temperature 1 data.

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

of the External Diode 3 data.

Bit 0- TEMP4_CFG = ‘1b’ tells the Look Up Table to reference the Forced Temperature 2 data instead

of the Internal Diode data.

Note: The values shown in Table A.6 are example settings. All the cells in the look-up table are

programmable via SMBus.

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

HIGH BYTE

135oC65oC50oC40oC

EFh

(1028 RPM)

240oC75oC55oC45oC

A3h

(1508 RPM)

350oC85oC60oC50oC

7Ah

(2014 RPM)

460oC90oC65oC55oC

62h

(2508 RPM)

570oC95oC70oC60oC

52h

(2997 RPM)

680oC

100oC75oC65oC

3Dh

(4029 RPM)

790oC

105oC80oC80oC

31h

(5016 RPM)

100oC110oC85oC

100oC

29h

(5994 RPM)

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