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Intel W3540 AT80601000921AB User Manual

Product codes
AT80601000921AB
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Thermal Specifications
82
Intel® Xeon® Processor 3500 Series Datasheet Volume 1 
6.1.1.1
Specification for Operation Where Digital Thermal Sensor Exceeds 
T
CONTROL
When the DTS value is less than T
CONTROL
 the fan speed control algorithm can reduce 
the speed of the thermal solution fan. This remains the same as with the previous 
guidance for fan speed control.
During operation where the DTS value is greater than T
CONTROL
, the fan speed control 
algorithm must drive the fan speed to meet or exceed the target thermal solution 
performance (Ψ
CA
) shown in 
. The ability to monitor the inlet temperature 
(T
AMBIENT
) is required to fully implement the specification as the target Ψ
CA 
is explicitly 
defined for various ambient temperature conditions. See the appropriate processor 
Thermal and Mechanical Design Guidelines (see 
) for details on 
characterizing the fan speed to Ψ
CA
 and ambient temperature measurement.
Notes:
1.
The ambient temperature is measured at the inlet to the processor thermal solution
2.
This column can be expressed as a function of T
AMBIENT
 by the following equation:
Y
CA
 = 0.19 + (43.2 – T
AMBIENT
) * 0.013
3.
This column can be expressed as a function of T
AMBIENT
 by the following equation:
Y
CA
 = 0.19 + (43.2 – T
AMBIENT
) * 0.0077
Table 6-3.
Thermal Solution Performance above T
CONTROL
T
AMBIENT
1
Ψ
CA
 at DTS = T
CONTROL
2
Ψ
CA
 at DTS = -1
3
43.2
0.190
0.190
42.0
0.206
0.199
41.0
0.219
0.207
40.0
0.232
0.215
39.0
0.245
0.222
38.0
0.258
0.230
37.0
0.271
0.238
36.0
0.284
0.245
35.0
0.297
0.253
34.0
0.310
0.261
33.0
0.323
0.268
32.0
0.336
0.276
31.0
0.349
0.284
30.0
0.362
0.292
29.0
0.375
0.299
28.0
0.388
0.307
27.0
0.401
0.315
26.0
0.414
0.322
25.0
0.427
0.330
24.0
0.440
0.338
23.0
0.453
0.345
22.0
0.466
0.353
21.0
0.479
0.361
20.0
0.492
0.368
19.0
0.505
0.376
18.0
0.519
0.384