EMC2300-AZC-TR SMSC, EMC2300-AZC-TR Datasheet - Page 64

• Manufacturer Part Number: EMC2300-AZC-TR
• Description: Industrial Temperature Sensors Auto Fan Contrllr Up to 4 Fans
• Manufacturer: SMSC

Specifications of EMC2300-AZC-TR

• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

Revision 0.32 (06-23-08)
8.2.16
Register
Address
64h
65h
66h
RRX-[2:0]
000
001
010
100
101
011
110
111
MINIMUM PWM DUTY
Read/
Write
R/W
R/W
R/W
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.
100%
25%
50%
0%
.
.
.
.
.
.
.
.
.
100% DUTY CYCLE)
PWM RAMP TIME
(TIME FROM 33%
DUTY CYCLE TO
PWM1 Minimum Duty Cycle
PWM2 Minimum Duty Cycle
PWM3 Minimum Duty Cycle
(SEC)
Table 8.30 Registers 64-66h: Minimum PWM Duty Cycle
Register Name
17.6
11.8
7.0
4.4
3.0
1.6
0.8
35
Table 8.31 PWM Duty vs. Register Setting
Table 8.29 PWM Ramp Rate Control
100% DUTY CYCLE)
VALUE (DECIMAL)
PWM RAMP TIME
DATASHEET
DUTY CYCLE TO
(TIME FROM 0%
(MSb)
Bit 7
7
7
7
17.595
10.455
(SEC)
52.53
26.52
1.275
128
255
6.63
4.59
2.55
64
64
0
.
.
.
.
.
.
.
.
.
Bit 6
Fan Control Device with High Frequency PWM and Temperature Monitors
6
6
6
Bit 5
5
5
5
TIME PER PWM STEP
Bit 4
(PWM STEP SIZE =
4
4
4
206 msec
104 msec
Bit 3
69 msec
41 msec
26 msec
18 msec
10 msec
5 msec
3
3
3
1/255)
Bit 2
2
2
2
VALUE (HEX)
Bit 1
00h
40h
80h
FFh
1
1
1
.
.
.
.
.
.
.
.
.
RAMP RATE
(LSb)
SMSC EMC2300
Bit 0
0
0
0
14.49
24.39
38.46
55.56
PWM
4.85
9.62
100
200
(HZ)
Datasheet
Default
Value
80h
80h
80h