EMC6D100-DK SMSC [SMSC Corporation], EMC6D100-DK Datasheet - Page 56

• Manufacturer Part Number: EMC6D100-DK
• Description: ENVIRONMENTAL MONITORING AND CONTROL DEVICE WITH AUTOMATIC FAN CAPABILITY
• Manufacturer: SMSC [SMSC Corporation]

REGISTER
8.21
ADDRESS
SMSC EMC6D100/EMC6D101
64h
65h
66h
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.
READ/
WRITE
R/W
R/W
R/W
Table 8.11 - PWM Output Below Limit Depending On Value Of Off/Min
Fan1 PWM
Fan2 PWM
Fan3 PWM
REGISTER
Minimum
Minimum
Minimum
000
001
010
011
100
101
110
111
0
1
0%
25%
50%
100%
NAME
MINIMUM PWM
ZNX-[2:0]
OFF/MIN
DUTY
Table 8.12 - PWM Duty vs. Register Setting
(MSB)
BIT 7
DATASHEET
Table 8.10 - Spike Smoothing
7
7
7
BIT 6
35
17.6
11.8
7.0
4.4
3.0
1.6
0.8
At 0% duty below LIMIT
At Min PWM Duty below LIMIT
0
64
128
255
6
6
6
SPIKE SMOOTHED OVER (SEC)
(DECIMAL)
Page 56
VALUE
BIT 5
5
5
5
PWM ACTION
BIT 4
4
4
4
00h
40h
80h
FFh
VALUE (HEX)
BIT 3
3
3
3
Environmental Monitoring and Control Device
BIT 2
2
2
2
BIT 1
1
1
1
(LSB)
BIT 0
0
0
0
Rev. 09-09-04
DEFAULT
Datasheet
VALUE
80h
80h
80h