ASC7512 ETC2 [List of Unclassifed Manufacturers], ASC7512 Datasheet - Page 26

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

For the current temperature reading T
If these spikes are not filtered, the CPU fan (if connected to aSC7512) may turn on prematurely or produce unpleasant
noise. For this reason, any zone that is connected to a chipset or processor should have spike smoothing enabled.
Individual system characteristics will determine how large this coefficient should be.
When spike smoothing is enabled, the temperature reading registers will still reflect the current value of the temperature –
not the “smoothed out” value.
ZN1E and ZN2E enable temperature smoothing for zones 1 and 2 respectively.
ZN1-2, ZN1-1 and ZN1-0 control smoothing time for Zone 1.
ZN2-2, ZN2-1 and ZN2-0 control smoothing time for Zone 2.
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.
© Andigilog, Inc. 2006
Figure 10 Representation of What Temperature Is Passed to the aSC7512 Auto Fan Control with (green)
No-Spike T
Smooth T
i
= (No-Spike T
i
= (Discard min and max of (T
Table 18 PWM Output Below Limit Depending on Value of Off/Min
At 0% duty below LIMIT
At Min PWM Duty below LIMIT
i
- Smooth T
and without (red dashed) Spike Smoothing
i
:
60
50
40
30
20
10
PWM Action
0
1
Spike Smoothing
Filter Coefficient
i-1
2
Table 17 Spike Smoothing
)/2
3
N
i
, T
+ Smooth T
8
7
6
5
4
3
2
1
i-1
4
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, T
5
i-2
, T
- 26 -
6
i-3
i-1
))/2
7
8
ZNn-[2:0]
9
000
001
010
011
100
101
110
111
Off/Min Bit
10 11 12
0
1
August 2006 - 70A05003
aSC7512