W83793G Datasheet, PDF (68/131 Pages) Winbond – Winbond H/W Monitor

W83793G
DIVISOR[3:0]
MAPPED
DIVISOR
0000
1
0001
2
0010
3
0011
4
0100
5
0101
6
0110
7
0111
8
OUTPUT
FREQUENCY
512Hz
256Hz
171Hz
128Hz
102Hz
85Hz
73Hz
64Hz
DIVISOR[3:0]
MAPPED
DIVISOR
1000
12
1001
16
1010
32
1011
64
1100
128
1101
256
1110
512
1111
1024
OUTPUT
FREQUENCY
43Hz
32Hz
16Hz
8Hz
4Hz
2Hz
1Hz
0.5Hz
8.11.2.7 SmartFan Output Step Up Time (UpTime)
UpTime regulates the time interval of fastest Fan speed up a unit. Default setting is 0.6sec.
Location :
UpTime - Bank 0 Address C3_HEX
Type : Read / Write
Reset :
VSB5V(Pin 7) Rising,
Init Reset(CR40.Bit7) is set,
VDD5V(Pin 25) Rising @ RST_VDD_MD(CR40.Bit4) set,
SYSRSTIN_N(Pin 15) Falling @ SYSRST_MD(CR40.Bit5) set.
BIT
Name
Reset
UPTIME
7
6
5
4
3
2
1
0
UpTime
06_HEX
BIT
DESCRIPTION
7-0
UpTime(SmartFan Step Up Time). Unit in 0.1sec. Programmed as the interval of continuous
Fan ramping up.
SmartFan mostly control fans smoothly, which means it seldom suddenly add a large duty to fan or
decrease a large duty. Instead, most often it increase/decrease duty by 1 LSB one time. The Up Time
/ Down Time register defines the time interval between successively increase/decrease duty. If this
value set too small, Fan will have no time to reflect the speed after tuning the duty and sometimes
may cause Fan speed unstable; on the other hand, if set Up Time / Down Time too large, Fan may not
act fast enough to dissipate the heat. This register should never set to 0, otherwise will cause Fan
Duty abnormal.
Only in these cases, fan will suddenly jump large duty.
ÆVDD Power – on/off
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