EMC2104 datasheet(29/101 Pages) SMSC

No de pièce	EMC2104

Description	Dual RPM-Based PWM Fan Controller with Hardware Thermal Shutdown

PDF	101 Pages

Scroll/Zoom	100%

Fabricant	SMSC [SMSC Corporation]

Site Internet	http://www.smsc.com

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29 / 101 page

Dual RPM-Based PWM Fan Controller with Hardware Thermal Shutdown

Datasheet

SMSC EMC2104

Revision 1.74 (05-08-08)

DATASHEET

For example, if a desired RPM rate for a 2-pole fan is 3000 RPMs, then the user would input the

hexidecimal equivalent of 1296 (51h in the TACH Target Register). This number represents the number

of 32.768KHz cycles that would occur during the time it takes the fan to complete a single revolution

when it is spinning at 3000RPMs.

The EMC2104’s RPM based Fan Speed Control Algorithm has programmable configuration settings

for parameters such as ramp-rate control and spin up conditions. The fan driver automatically detects

and attempts to alleviate a stalled/stuck fan condition while also asserting the ALERT# pin. The

EMC2104 works with fans that operate up to 16,000 RPMs and provide a valid tachometer signal. The

fan controller will function either with an externally supplied 32.768KHz clock source or with it’s own

internal 32kHz oscillator depending on the required accuracy.

EMC2104 Fiches technique(PDF) 29 Page - SMSC Corporation