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EMC2300 Datasheet(PDF) 61 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) 61 Page - SMSC Corporation

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Fan Control Device with High Frequency PWM and Temperature Monitors
Datasheet
SMSC EMC2300
61
Revision 0.2 (06-14-06)
DATASHEET
8.2.14
Registers 5F-61h: Zone Temperature Range, PWM Frequency
These registers become read only when the Lock bit is set. Any further attempts to write to these
registers shall have no effect.
In Auto Fan Mode, when the temperature for a zone is above the Low Temperature Limit (registers
67-69h) and below the Absolute Temperature Limit (registers 6A-6Ch) the speed of a fan assigned to
that zone is determined as follows by the auto fan control logic.
When the temperature reaches the temperature value programmed in the Zone x Low Temp Limit
register, the PWM output assigned to that zone is at PWMx Minimum Duty Cycle. Between Zone x
Low Temp Limit and (Zone x Low Temp Limit + Zone x Range), the PWM duty cycle increases linearly
according to the temperature as shown in the figure below.
Figure 8.11 Fan Activity Above Low Temp Limit
Table 8.24 Fan Spin-Up Register
SPIN[2:0]
SPIN UP TIME
000
0 sec
001
100ms
010
250ms (default)
011
400ms
100
700ms
101
1000ms
110
2000ms
111
4000ms
Table 8.25 Registers 5F-61h: Zone Temperature Range, PWM Frequency
Register
Address
Read/
Write
Register Name
Bit 7
(MSb)
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
(LSb)
Default
Value
5Fh
R/W
Zone 1 Range / Fan 1
Frequency
RAN3
RAN2
RAN1
RAN0
FRQ3
FRQ2
FRQ1
FRQ0
C3h
60h
R/W
Zone 2 Range / Fan 2
Frequency
RAN3
RAN2
RAN1
RAN0
FRQ3
FRQ2
FRQ1
FRQ0
C3h
61h
R/W
Zone 3 Range / Fan 3
Frequency
RAN3
RAN2
RAN1
RAN0
FRQ3
FRQ2
FRQ1
FRQ0
C3h
Temperature
Below Fan Temp Limit: Fan at Fan PWM
Minimum
Temperature Low LIMIT:
output at MIN FAN
Low LIMIT+ RANGE:
Output at 100% Duty
PWM Duty is linear
this range


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