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EMC2300 Datasheet(PDF) 62 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) 62 Page - SMSC Corporation

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Fan Control Device with High Frequency PWM and Temperature Monitors
Datasheet
Revision 0.2 (06-14-06)
62
SMSC EMC2300
DATASHEET
Example for PWM1 assigned to Zone 1:
Zone 1 Low Temp Limit (Register 67h) is set to 50
°C (32h).
Zone 1 Range (Register 5Fh) is set to 8
°C (7h)
PWM1 Minimum Duty Cycle (Register 64h) is set to 50% (80h)
In this case, the PWM1 duty cycle will be 50% at 50
°C.
Since (Zone 1 Low Temp Limit) + (Zone 1 Range) = 50
°C + 8°C = 58°C, the fan controlled by PWM1
will run at 100% duty cycle when the temperature of the Zone 1 sensor is at 58
°C.
Since the midpoint of the fan control range is 54
°C, and the median duty cycle is 75% (Halfway
between the PWM Minimum and 100%), PWM1 duty cycle would be 75% at 54
°C.
Above (Zone 1 Low Temp Limit) + (Zone 1 Range), the duty cycle must be 100%.
The PWM frequency bits [3:0] determine the PWM frequency for the fan.
PWM Frequency Selection (Default =0011=29.3Hz)
Range Selection (Default =1100=32
°C)
Table 8.26 Register Setting vs. PWM Frequency
FREQ[3:0]
PWM FREQUENCY
0000
11.0 Hz
0001
14.6 Hz
0010
21.9 Hz
0011
29.3 Hz (default)
0100
35.2 Hz
0101
44.0 Hz
0110
58.6 Hz
0111
87.7 Hz
1000 - 1001
N/A
1010
~25 Khz
1011 - 1111
N/A
Table 8.27 Register Setting vs. Temperature Range
RAN[3:0]
RANGE (
°C)
0000
2
0001
2.5
0010
3.33
0011
4
0100
5
0101
6.67
0110
8


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