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EMC2300 Datasheet(PDF) 32 Page - SMSC Corporation

Part No. EMC2300
Description  Fan Control Device with High Frequency PWM and Temperature Monitors
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Maker  SMSC [SMSC Corporation]
Homepage  http://www.smsc.com
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EMC2300 Datasheet(HTML) 32 Page - SMSC Corporation

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Fan Control Device with High Frequency PWM and Temperature Monitors
Datasheet
Revision 0.2 (06-14-06)
32
SMSC EMC2300
DATASHEET
Figure 7.1 Automatic Fan Control Flow Diagram
*See Registers 5C-5Eh: PWM Configuration on page 59 for details.
When in Auto Fan Control Operating Mode the hardware controls the fans directly based on monitoring
of temperature and speed.
To control the fans:
Set the minimum temperature that will activate the Automatic Fan control algorithm. This value is
programmed in Registers 67h-69h: Zone x Low Temp Limit (Auto Fan Mode Only).
The speed of the fan is controlled by the duty cycle set for that device. The duty cycle for the minimum
fan speed must be programmed in Registers 64h-66h: PWMx Minimum Duty Cycle. This value
corresponds to the speed of the fan when the temperature reading is equal to the minimum
temperature LIMIT setting. As the actual temperature increases and is above the Zone LIMIT
temperature and below the Absolute Temperature Limit, the PWM will be determined by a linear
function based on the Auto Fan Speed Range bits in Registers 5Fh-61h.
AutoFanMode
Initiated
Temp>=
AbsLimit
(6A~6C)
OverrideallPWM
outputsto100%
dutycycleexceptif
disabledorin
manualmode
Temp>=Low
Limit
(67~69)
No
Yes
Setfanspeedbasedon
AutoFanRange
Algorithm*
No
BeginFanSpin-Up
Yes
SetFanOutputto
100%
FanSpinningUp?
SpinUp
TimeElapsed?
(5C-5E)
Yes
BeginPolling
Cycle
EndPollingCycle
No
No
EndFanSpinUp
Yes
Setfantomin
PWM
(64~66)
Yes
No
MinPWM
at0%?


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