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EMC2300 Datasheet(PDF) 37 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) 37 Page - SMSC Corporation

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Fan Control Device with High Frequency PWM and Temperature Monitors
Datasheet
SMSC EMC2300
37
Revision 0.2 (06-14-06)
DATASHEET
Figure 7.6 Illustration of PWM Ramp Rate Control
Notes:
The PWM Duty Cycle latches the Ramping Duty Cycle on the rising edge of the PWM output.
The calculated duty cycle, ramping duty cycle, and the PWM output duty cycle are asynchronous
to each other, but are all synchronized to the internal 90kHz clock source.
001
17.6
26.52
104 msec
9.62
010
11.8
17.595
69 msec
14.49
011
7.0
10.455
41 msec
24.39
100
4.4
6.63
26 msec
38.46
101
3.0
4.59
18 msec
55.56
110
1.6
2.55
10 msec
100
111
0.8
1.275
5 msec
200
Table 7.1 PWM Ramp Rate (continued)
RRX-[2:0]
PWM RAMP TIME (SEC)
(TIME FROM 33%
DUTY CYCLE TO
100% DUTY CYCLE)
PWM RAMP TIME (SEC)
(TIME FROM MIN DUTY
CYCLE TO 100% DUTY
CYCLE)
TIME PER
PWM STEP
(PWM STEP SIZE =
1/255)
PWM
RAMP
RATE
(HZ)
Example 1: PWM period < Ramp Rate Step Size
PWM frequency = 87.7Hz (11.4msec) & PWM Ramp Rate = 38.46Hz (26msec)
Calculate Duty Cycle
70h
74h
PWM Duty Cycle
70h
11.4ms
11.4ms
11.4ms
11.4ms
11.4ms
11.4ms
11.4ms
11.4ms
11.4ms
11.4ms
71h
71h
71h
72h
72h
73h
73h
73h
74h
74h
74h
Example 2: PWM period > Ramp Rate Step Size
PWM frequency = 11Hz (90.9msec) & PWM Ramp Rate = 38.46Hz (26msec)
Calculate Duty Cycle
70h
74h
Ramping Duty Cycle
PWM Duty Cycle
70h
70h
71h
72h
73h
74h
26ms
26ms
26ms
26ms
Ramping Duty Cycle
70h
71h
72h
73h
74h
26ms
26ms
26ms
26ms
90.9msec
71h
74h


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