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© Andigilog, Inc. 2006
www.andigilog.com
August 2006 - 70A05003
aSC7512
Register 64h: Minimum 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
64h
R/W
Fan PWM
Minimum
7
6
5
4
3
2
1
0
80
X
This register specifies the minimum duty cycle that the PWM will output when the measured temperature reaches the
Temperature LIMIT register setting.
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. After power up the default value is used whenever the Ready/Lock/Start/Override
register Start bit is cleared even though modifications to this register are possible.
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 19 Minimum PWM Duty Cycle Setting
Register 67-68h: 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
Zone1 Fan
Temp Limit
7
6
5
4
3
2
1
0
5A
X
68h
R/W
Zone2 Fan
Temp Limit
7
6
5
4
3
2
1
0
5A
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. After power up the default value is used whenever the Ready/Lock/Start/Override register
Start bit is cleared even though modifications to this register are possible.
Temperature
Fan Temp Limit
(2’s Complement)
>127°C
0111
1111
+127°C
0111
1111
+125°C
0111
1101
+90°C (default)
0101
1010
+50°C
0011
0010
+25°C
0001
1001
0°C
0000
0000
-50°C
1100
1110
-127°C
1000
0001
Table 20 Fan Temperature Limit Register -
8-Bit Two’s Complement
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