EMC6D103S-CZC-TR SMSC, EMC6D103S-CZC-TR Datasheet - Page 71

• Manufacturer Part Number: EMC6D103S-CZC-TR
• Description: Industrial Temperature Sensors Auto Fan Contrllr Up to 4 Fans
• Manufacturer: SMSC

Specifications of EMC6D103S-CZC-TR

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

Fan Control Device with High Frequency PWM Support and Hardware Monitoring Features
Datasheet
SMSC EMC6D103
8.2.19
Register
Address
64h
65h
66h
RRX-[2:0]
000
001
010
100
101
011
110
111
Read/
Write
R/W
R/W
R/W
Ramp Rate Control
The Ramp Rate Control logic limits the amount of change to the PWM duty cycle over a period of time.
This period of time is programmable via the Ramp Rate Control bits. For a detailed description of the
Ramp Rate Control bits see
Rate Control Logic on page
Note:
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.
RR1E, RR2E, and RR3E enable PWM Ramp Rate Control for PWM 1, 2, and 3 respectively.
RR1-2, RR1-1, and RR1-0 control ramp rate time for PWM 1
RR2-2, RR2-1, and RR2-0 control ramp rate time for PWM 2
RR3-2, RR3-1, and RR3-0 control ramp rate time for PWM 3
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 8.34 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 8.33 PWM Ramp Rate Control
38.
Table
100% DUTY CYCLE)
8.33. For a description of the Ramp Rate Control logic see
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
6.63
4.59
2.55
71
Bit 6
6
6
6
Bit 5
5
5
5
Bit 4
TIME PER PWM STEP
4
4
4
(PWM STEP SIZE =
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
Bit 1
Revision 0.3 (03-01-07)
1
1
1
RAMP RATE
(LSb)
Bit 0
0
0
0
PWM
14.49
24.39
38.46
55.56
4.85
9.62
(HZ)
100
200
Default
Value
80h
80h
80h
Ramp