ASC7512 ETC2 [List of Unclassifed Manufacturers], ASC7512 Datasheet - Page 28

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

Register
Address
In the Auto Fan mode, if a zone exceeds the temperature set in the Absolute Temperature Limit register, all of the PWM
outputs will increase its duty cycle to 100%. This is a safety feature that attempts to cool the system if there is a potentially
catastrophic thermal event. If set to 80h (-128°C), the feature is disabled. Default = 100 C = 64h.
These registers become read-only when the Ready/Lock/Start/Override register Lock bit is set. Any further attempts to write
to these registers shall have no effect. After power up the default values are used whenever the Ready/Lock/Start/Override
register Start bit is cleared even though modifications to these registers are possible.
Register
Address
If the temperature is above Fan Temp Limit, then drops below Fan Temp Limit, the following will occur:
This register becomes read-only when the Ready/Lock/Start/Override register Lock bit is set. Any further attempts to write to
these registers 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 6A-6Bh: Temperature Limit
Register 6Dh: Thermal Zone Hysteresis
6Ah
6Bh
6Dh
•
•
The fan will remain on, at Fan PWM Minimum, until the temperature goes a certain amount below Fan Temp Limit.
The Hysteresis registers control this amount. See below table for details.
Read/
Read/
Write
Write
R/W
R/W
R/W
Zone 1 Temp
Absolute Limit
Zone 2 Temp
Absolute Limit
Zone 1 and
Zone 2
Hysteresis
Register
Register
Name
Name
Table 21 Absolute Temperature Limit Register -
(MSB)
(MSB)
Bit 7
Bit 7
H1-3
Table 22 Zone Hysteresis Register Format
7
7
Temperature
4°C (default)
-128°C (Disable)
+100°C (default)
Temperature
10°C
15°C
0°C
1°C
Bit 6
Bit 6
H1-2
>127°C
+127°C
+125°C
-127°C
+50°C
+25°C
-50°C
8-Bit Two’s Complement
6
6
0°C
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Bit 5
Bit 5
H1-1
5
5
- 28 -
Zone Hysteresis Hn-[3:0]
Bit 4
Bit 4
H1-0
(2’s Complement)
4
4
0111
0111
0111
0110
0011
0001
0000
1100
1000
1000
Absolute Limit
0000
0001
0100
1010
1111
Bit 3
Bit 3
H2-3
3
3
1111
1111
1101
0100
0010
1001
0000
1110
0001
0000
Bit 2
Bit 2
H2-2
2
2
Bit 1
Bit 1
H2-1
1
1
August 2006 - 70A05003
(LSB)
(LSB)
Bit 0
Bit 0
H2-0
0
0
aSC7512
Default
Default
Value
Value
64
64
44
Lock
Lock
X
X
X