EMC6D102-CZC-TR View Datasheet(PDF) - SMSC -> Microchip
Part Name
Description
MFG CO.
EMC6D102-CZC-TR
SMSC -> Microchip
'EMC6D102-CZC-TR' PDF : 86 Pages View PDF
Fan Control Device with Hardware Monitoring and Acoustic Noise Reduction Features
Datasheet
Table 6.3 Minimum RPM Detectable Using 3 Edges – No PWM Stretching (continued)
PWM
FREQUENCY
PULSE WIDTH AT DUTY CYCLE
(PWM ”ON” TIME)
MINIMUM RPM AT DUTY CYCLE (Note 6.4)
(30/TTachPulse)
(HZ)
25%
(MSEC)
50%
(MSEC)
100%
(MSEC)
(Note 6.3)
25%
50%
100%
29.3
8.53
17.06
34
3554
1768
885
21.9
11.42
22.83
45.48
2648
1319
661
14.6
17.12
34.25
68.23
1761
878
440
11
22.73
45.45
90.55
1325
661
332
Note 6.3 100% duty cycle is 255/256.
Note 6.4
RPM=60/TRevolution, TTachPulse= TRevolution/2. Using 3 edges for detection, TTachPulse =
(PWM ”ON” Time – Guard Time). Minimum RPM values shown use minimum guard time
(88.88usec).
Table 6.4 Minimum RPM Detectable Using 2 Edges – No PWM Stretching
PWM
FREQUENCY
(HZ)
87.7
58.6
44
35.2
29.3
21.9
14.6
11
PULSE WIDTH AT DUTY CYCLE
(PWM ”ON” TIME)
25%
(MSEC)
2.85
4.27
5.68
7.1
8.53
11.42
17.12
22.73
50%
(MSEC)
5.7
8.53
11.36
14.2
17.06
22.83
34.25
45.45
100%
(MSEC)
(Note 6.5)
11.36
17
22.64
28.3
34
45.48
68.23
90.55
MINIMUM RPM AT DUTY CYCLE (Note 6.6)
(30/TTachPulse)
25%
5433
3588
2683
2139
1777
1324
881
663
50%
2673
1777
1331
1063
884
660
439
331
100%
1331
887
665
532
442
330
220
166
Note 6.5 100% duty cycle is 255/256
Note 6.6
RPM=60/TRevolution, TTachPulse= TRevolution/2. Using 2 edges for detection, TTachPulse =
2*(PWM ”ON” Time-Guard Time). Minimum RPM values shown use minimum guard time
(88.88usec).
Revision 0.4 (04-05-05)
42
DATASHEET
SMSC EMC6D102
Share Link: 