EMC2300-AZC-TR SMSC, EMC2300-AZC-TR Datasheet - Page 37

• 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

Fan Control Device with High Frequency PWM and Temperature Monitors
Datasheet
SMSC EMC2300
RRX-[2:0]
Ramping Duty Cycle
Calculate Duty Cycle
PWM Duty Cycle
Ramping Duty Cycle
Calculate Duty Cycle
PWM Duty Cycle
Example 1: PWM period < Ramp Rate Step Size
PWM frequency = 87.7Hz (11.4msec) & PWM Ramp Rate = 38.46Hz (26msec)
Example 2: PWM period > Ramp Rate Step Size
PWM frequency = 11Hz (90.9msec) & PWM Ramp Rate = 38.46Hz (26msec)
000
001
010
100
101
011
110
111
PWM RAMP TIME (SEC)
100% DUTY CYCLE)
(TIME FROM 33%
DUTY CYCLE TO
17.6
11.8
7.0
4.4
3.0
1.6
0.8
35
70h
70h
70h
70h
70h
70h
Figure 7.4 Illustration of PWM Ramp Rate Control
11.4ms
71h
Table 7.1 PWM Ramp Rate
71h
71h
26ms
26ms
PWM RAMP TIME (SEC)
(TIME FROM MIN DUTY
CYCLE TO 100% DUTY
71h
DATASHEET
11.4ms
71h
CYCLE)
74h
17.595
10.455
74h
52.53
26.52
1.275
37
6.63
4.59
2.55
11.4ms
72h
72h
72h
26ms
26ms
71h
90.9msec
11.4ms
72h
11.4ms
73h
(PWM STEP SIZE =
73h
73h
PWM STEP
11.4ms
TIME PER
73h
206 msec
104 msec
69 msec
41 msec
26 msec
18 msec
10 msec
5 msec
1/255)
11.4ms
73h
Revision 0.32 (06-23-08)
74h
11.4ms
74h
74h
74h
11.4ms
RAMP
74h
RATE
PWM
14.49
24.39
38.46
55.56
4.85
9.62
100
200
(HZ)
74h