ASC7611 ETC2 [List of Unclassifed Manufacturers], ASC7611 Datasheet - Page 31

• Manufacturer Part Number: ASC7611
• Description: HARDWARE MONITOR WITH INTEGRATED FAN CONTROL
• Manufacturer: ETC2 [List of Unclassifed Manufacturers]

Register 38-3Ah: Maximum PWM Duty Cycle
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 10.
Register 67-69h: Temperature Limit
Register
Address
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.
© Andigilog, Inc. 2006
Register
Address
67h
68h
69h
3Ah
38h
39h
Read/
Write
R/W
R/W
R/W
Read/
Write
R/W
R/W
R/W
Zone1 Fan
Temp Limit
Zone2 Fan
Temp Limit
Zone 3 Fan
Temp Limit
Fan 1 Max Duty
Cycle
Fan 2 Max Duty
Cycle
Fan 3 Max Duty
Cycle
Register Name
Register
Name
(MSB)
Bit 7
Table 17 Fan Temperature Limit Register -
7
7
7
(MSB)
+90°C (default)
Bit 7
Temperature
7
7
7
Bit 6
>127°C
+127°C
+125°C
-127°C
+50°C
+25°C
-50°C
8-Bit Two’s Complement
6
6
6
0°C
Bit 6
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6
6
6
Bit 5
5
5
5
- 31 -
Bit 5
5
5
5
Bit 4
(2’s Complement)
4
4
4
Fan Temp Limit
0111
0111
0111
0101
0011
0001
0000
1100
1000
Bit 4
4
4
4
Bit 3
3
3
3
1111
1111
1101
1010
0010
1001
0000
1110
0001
Bit 3
3
3
3
Bit 2
2
2
2
Bit 2
2
2
2
Bit 1
1
1
1
Bit 1
October 2006 - 70A05007
(LSB)
1
1
1
Bit 0
0
0
0
aSC7611
(LSB)
Bit 0
Default
Value
0
0
0
5A
5A
5A
Default
Value
FF
FF
FF
Lock
X
X
X