ASC7512 ETC2 [List of Unclassifed Manufacturers], ASC7512 Datasheet - Page 27

• Manufacturer Part Number: ASC7512
• Description: DIGITAL TEMPERATURE SENSOR WITH INTEGRATED FAN CONTROL
• Manufacturer: ETC2 [List of Unclassifed Manufacturers]

Register
Address
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 67-68h: 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. 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.
© Andigilog, Inc. 2006
Register 64h: Minimum PWM Duty Cycle
64h
67h
68h
R/W
Read/
Read/
Write
Write
R/W
R/W
Fan PWM
Minimum
Zone1 Fan
Temp Limit
Zone2 Fan
Temp Limit
Register
Register
Name
Name
(MSB)
Table 19 Minimum PWM Duty Cycle Setting
(MSB)
Bit 7
Table 20 Fan Temperature Limit Register -
Bit 7
7
7
7
Minimum PWM %
~50% (Default)
+90°C (default)
Temperature
Bit 6
Bit 6
~25%
~75%
100%
>127°C
+127°C
+125°C
-127°C
+50°C
+25°C
0%
-50°C
8-Bit Two’s Complement
6
6
6
0°C
www.andigilog.com
Bit 5
Bit 5
5
5
5
- 27 -
1000
0000
0100
1100
1111
Bit 4
Bit 4
(2’s Complement)
Register Value
Binary
4
4
Fan Temp Limit
0111
0111
0111
0101
0011
0001
0000
1100
1000
4
0000
0000
0000
0000
1111
Bit 3
Bit 3
3
3
3
1111
1111
1101
1010
0010
1001
0000
1110
0001
Hex
C0
FF
00
40
80
Bit 2
Bit 2
2
2
2
Bit 1
Bit 1
1
1
1
August 2006 - 70A05003
(LSB)
Bit 0
(LSB)
Bit 0
0
0
0
aSC7512
Default
Value
Default
Value
5A
5A
80
Lock
Lock
X
X
X