EMC2102 Standard Microsystems Corporation, EMC2102 Datasheet - Page 22

• Manufacturer Part Number: EMC2102
• Description: Rpm-based Fan Controller with HW Thermal Shutdown
• Manufacturer: Standard Microsystems Corporation

Revision 1.95 (10-19-06)
M ain tain F a n D riv e
The EMC2102’s RPM based Fan 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 EMC2102
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 32.768KHz oscillator depending on the required accuracy.
R e d u ce F a n D rive
Y es
Y e s
Figure 5.2 RPM based Fan Control Algorithm
M e a su re F an S pe e d
S e t T A C H T a rge t
N o
R e a ding =
R e a ding <
R e qu ired
S p in U p
T a rge t?
T a rge t?
C ou n t
T A C H
T A C H
T A C H
T A C H
?
DATASHEET
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RPM-Based Fan Controller with HW Thermal Shutdown
P erform S pin U p
R o u tin e
R am p R a te C on tro l
SMSC EMC2102
Datasheet