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EMC6D100 Datasheet(PDF) 53 Page - SMSC Corporation

Part # EMC6D100
Description  ENVIRONMENTAL MONITORING AND CONTROL DEVICE WITH AUTOMATIC FAN CAPABILITY
PDF  75 Pages
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Manufacturer  SMSC [SMSC Corporation]
Direct Link  http://www.smsc.com
Logo SMSC - SMSC Corporation

EMC6D100 Datasheet(HTML) 53 Page - SMSC Corporation

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Environmental Monitoring and Control Device
Datasheet
SMSC EMC6D100/EMC6D101
Page 53
Rev. 09-09-04
DATASHEET
Table 8.7 - 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
8.19
Registers 5F-61h: Auto Fan Speed 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
Fan 1
Range/Frequency
RAN3
RAN2
RAN1
RAN0
RES
FRQ2
FRQ1
FRQ0
C3h
60h
R/W
Fan 2
Range/Frequency
RAN3
RAN2
RAN1
RAN0
RES
FRQ2
FRQ1
FRQ0
C3h
61h
R/W
Fan 3
Range/Frequency
RAN3
RAN2
RAN1
RAN0
RES
FRQ2
FRQ1
FRQ0
C3h
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 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:
When the temperature reaches the Fan Temp Limit for a zone, the PWM output assigned to that zone is at
Fan PWM Minimum. Between Fan Temp Limit and (Fan Temp Limit + Range), the PWM duty cycle
increases linearly according to the temperature as shown in the figure below.
Temperature
Below Fan Temp Limit: Fan is off or at Fan PWM
Minimum depending on bit[7:5] of register 62h
and bit 2 of register 7Fh
Temperature LIMIT: PWM
output at MIN FAN SPEED
LIMIT+ RANGE: PWM
Output at 100% Duty
PWM Duty is linear over
this range
FIGURE 8.1 - FAN ACTIVITY ABOVE FAN TEMP LIMIT



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