EMC2113 datasheet(63/88 Pages) MICROCHIP

63 / 88 page

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

Datasheet

 2013 Microchip Technology Inc.

DS20005251A-page 63

Bit 5 - NOKICK - Determines if the Spin Up Routine will drive the fan to 100% duty cycle for 1/4 of the

programmed spin up time before driving it at the programmed level.



‘0’ (default) - The Spin Up Routine will drive the PWM to 100% for 1/4 of the programmed spin up

time before reverting to the programmed spin level.



‘1’ - The Spin Up Routine will not drive the PWM to 100%. It will set the drive at the programmed

spin level for the entire duration of the programmed spin up time.

Bits 4 - 2 - SPIN_LVL[2:0] - Determines the final drive level that is used by the Spin Up Routine as

shown in Table 7.43, "Spin Level".

Bit 1 -0 - SPINUP_TIME[1:0] - determines the maximum Spin Time that the Spin Up Routine will run

for (see Section 6.8, "Spin Up Routine"). If a valid tachometer measurement is not detected before the

Spin Time has elapsed, then an interrupt will be generated. When the RPM-based Fan Speed Control

Algorithm is active, the fan driver will attempt to re-start the fan immediately after the end of the last

spin up attempt.

The Spin Time is set as shown in Table 7.44.

32 - the Drive Fail detection circuitry will count for 32

update periods

64 - the Drive Fail detection circuitry will count for 64

update periods

Table 7.43 Spin Level

SPIN_LVL[2:0]

SPIN UP DRIVE LEVEL

30%

35%

40%

45%

50%

55%

60% (default)

65%

Table 7.42 DRIVE_FAIL_CNT[1:0] Bit Decode (continued)

DRIVE_FAIL_CNT[1:0]

NUMBER OF UPDATE PERIODS

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