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© Andigilog, Inc. 2006
www.andigilog.com
October 2006 - 70A06010
aSC7621
Register Value
Minimum PWM %
Binary
Hex
0%
0000
0000
00
~25%
0100
0000
40
~50% (Default)
1000
0000
80
~75%
1100
0000
C0
100%
1111
1111
FF
Table 25 Minimum PWM Duty Cycle Setting
Register 38-3Ah: Maximum PWM Duty Cycle
Register
Address
Read/
Write
Register
Name
Bit 7
(MSB)
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
(LSB)
Default
Value
Lock
38h
R/W
Fan 1 Max
Duty Cycle
7
6
5
4
3
2
1
0
FF
X
39h
R/W
Fan 2 Max
Duty Cycle
7
6
5
4
3
2
1
0
FF
X
3Ah
R/W
Fan 3 Max
Duty Cycle
7
6
5
4
3
2
1
0
FF
X
The Maximum PWM Duty registers store the maximum duty cycle that may be commanded at each PWM output under
automatic fan control. This value is overridden to 100% when the assigned zone’s temperature has exceeded the Absolute
Maximum Temperature setting. When temperature falls below Absolute Maximum, PWM command will resume the linear
ramp only after it has fallen by the Thermal Zone Hysteresis value (Registers 6D-6Eh). Values follow the representation in
Table 19.
This register becomes read-only when the Ready/Lock/Start/Override register Lock bit is set. Any further attempts to write to
this register shall have no effect.
Register 67-69h: Temperature Limit
Register
Address
Read/
Write
Register
Name
Bit 7
(MSB)
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
(LSB)
Default
Value
Lock
67h
R/W
Zone 1 Fan
Temp Limit
7
6
5
4
3
2
1
0
5A
X
68h
R/W
Zone 2 Fan
Temp Limit
7
6
5
4
3
2
1
0
5A
X
69h
R/W
Zone 3 Fan
Temp Limit
7
6
5
4
3
2
1
0
5A
X
3Bh
R/W
Zone 4 Fan
Temp Limit
7
6
5
4
3
2
1
0
E0
X
These are the temperature limits for the individual zones. When the current temperature equals this limit, the fan will be
turned on if it is not already. When the temperature exceeds this limit, the fan speed will be increased according to the
algorithm set forth in the Auto Fan Range, PWM Frequency register description, Default = 90
°C = 5Ah
This register becomes read-only when the Ready/Lock/Start/Override register Lock bit is set. Any further attempts to write to
this register shall have no effect.
Temperature
Fan Temp Limit
(2’s Complement)
>127°C
0111
1111
+127°C
0111
1111
+125°C
0111
1101
+90°C (default)
0101
1010
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