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EMC2300 Datasheet(PDF) 64 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) 64 Page - SMSC Corporation

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Fan Control Device with High Frequency PWM and Temperature Monitors
Datasheet
Revision 0.2 (06-14-06)
64
SMSC EMC2300
DATASHEET
8.2.16
Registers 64-66h: Minimum PWM Duty Cycle
These registers become read only when the Lock bit is set. Any further attempts to write to these
registers shall have no effect.
These registers specify the minimum duty cycle that the PWM will output when the measured
temperature reaches the Temperature LIMIT register setting in Auto Fan Control Mode.
Table 8.29 PWM Ramp Rate Control
RRX-[2:0]
PWM RAMP TIME
(SEC)
(TIME FROM 33%
DUTY CYCLE TO
100% DUTY CYCLE)
PWM RAMP TIME
(SEC)
(TIME FROM 0%
DUTY CYCLE TO
100% DUTY CYCLE)
TIME PER PWM STEP
(PWM STEP SIZE =
1/255)
PWM
RAMP RATE
(HZ)
000
35
52.53
206 msec
4.85
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 8.30 Registers 64-66h: Minimum PWM Duty Cycle
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
64h
R/W
PWM1 Minimum Duty Cycle
7
6
5
4
3
2
1
0
80h
65h
R/W
PWM2 Minimum Duty Cycle
7
6
5
4
3
2
1
0
80h
66h
R/W
PWM3 Minimum Duty Cycle
7
6
5
4
3
2
1
0
80h
Table 8.31 PWM Duty vs. Register Setting
MINIMUM PWM DUTY
VALUE (DECIMAL)
VALUE (HEX)
0%
0
00h
.
.
.
.
.
.
.
.
.
25%
64
40h
.
.
.
.
.
.
.
.
.
50%
128
80h
.
.
.
.
.
.
.
.
.
100%
255
FFh


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