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EMC2300 Datasheet(PDF) 75 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) 75 Page - SMSC Corporation

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Fan Control Device with High Frequency PWM and Temperature Monitors
Datasheet
SMSC EMC2300
75
Revision 0.2 (06-14-06)
DATASHEET
Chapter 9 Timing Diagrams
9.1
PWM Outputs
The following section shows the timing for the PWM[1:3] outputs.
Figure 9.1 PWMx Output Timing
Note 9.2
This value is programmable by the PWM frequency bits located in the FRFx registers.
Note 9.3
The PWM High Time is based on a percentage of the total PWM period (min=0/256*TPWM,
max =255/256*TPWM). During Spin-up the PWM High Time can reach a 100% or Full On.
(TPWM = t1).
Table 9.1 Timing for PWM[1:3] Outputs
NAME
DESCRIPTION
MIN
TYP
MAX
UNITS
t1
PWM Period (Note 9.2)
0.04
90.9
msec
t2
PWM High Time (Note 9.3)
0
99.6
%
t1
t2
FANx


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