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EMC2101-R-ACZL-TR датащи(PDF) 44 Page - SMSC Corporation

номер детали EMC2101-R-ACZL-TR
подробное описание детали  SMBus Fan Control with 1째C Accurate Temperature Monitoring
PDF  55 Pages
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производитель  SMSC [SMSC Corporation]
домашняя страница  http://www.smsc.com
Logo SMSC - SMSC Corporation

EMC2101-R-ACZL-TR датащи(HTML) 44 Page - SMSC Corporation

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SMBus Fan Control with 1°C Accurate Temperature Monitoring
Datasheet
Revision 2.53 (03-13-07)
44
SMSC EMC2101
DATASHEET
Maximum resolution is achieved by setting the PWM Frequency Register to 1Fh. With maximum
resolution, the desired PWM frequency can be achieved by adjusting the PWM Frequency Divide
Register setting (PWM_D[7:0]) as shown in Table 6.26.
For example, if the user desires a 30Hz PWM frequency with maximum PWM resolution, then the
PWM_F[4:0] bits should be set at 1Fh (31d) and the the PWM_D bits should be set at C1h (193d).
6.21
Fan Control Look-Up Table Hysteresis Register
The Fan Control Look-Up Table Hysteresis Register determines the amount of hysteresis applied to
the temperature inputs of the fan control Fan Control Look-Up Table. See Section 5.6.4.
Where:
[5]
PWM_F is the setting of the PWM
Frequency register (4Dh)
PWM_D is the setting of the PWM
Frequency Divide Register (4Eh)
FREQ is the desired PWM
Frequency
Table 6.26 Examples of Fan PWM Frequency with Maximum Resolution
PWM_F[4:0] = 1Fh
PWM_D[7:0]
SETTING
EFFECTIVE
RESOLUTION
(%)
EFFECTIVE
DUTY CYCLE
(AT 50%
FAN_SETTING)
EFFECTIVE
DUTY CYCLE
(AT 75%
FAN_SETTING)
FAN_SETTING
TO GET 75%
DUTY CYCLE
EFFECTIVE PWM
FREQUENCY (HZ)
01h
1.61
51.6%
77.4%
2Eh (74.2%)
5806.5
11h
1.61
51.6%
77.4%
2Eh (74.2%)
341.6
20h
1.61
51.6%
77.4%
2Eh (74.2%)
181.5
47h
1.61
51.6%
77.4%
2Eh (74.2%)
81.8
C0
1.61
51.6%
77.4%
2Eh (74.2%)
30.2
C1
1.61
51.6%
77.4%
2Eh (74.2%)
30.0
FFh
1.61
51.6%
77.4%
2Eh (74.2%)
22.7
Table 6.27 Look Up Table Hysteresis Register
ADDR.
R/W
REGISTER
B7
B6
B5
B4
B3
B2
B1
B0
DEFAULT
4Fh
R/W
Fan Control Look-
Up Table Hysteresis
-
-
-
16
842
1
04h
(4°C)
PWM_D
360k
2
PWM_F
×
--------------------------------
⎝⎠
⎛⎞
1
FREQ
-----------------
×
5806
FREQ
-----------------
==



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