Intel L3426 BV80605004737AA Data Sheet

Product codes
BV80605004737AA
Page of 102
Dual-Core Intel® Xeon® Processor 3000 Series Datasheet
85
Thermal Specifications and Design Considerations
NOTES:
1.
Intel does not support or recommend operation of the thermal diode under reverse bias.
2.
Same as I
FW 
.
3.
Preliminary data. Will be characterized across a temperature range of 50–80 °C.
4.
Not 100% tested. Specified by design characterization.
5.
The ideality factor, nQ, represents the deviation from ideal transistor model behavior as 
exemplified by the equation for the collector current:
I
C
 = I
S
 * (e 
qV
BE
/n
Q
kT
 –1)
Where I
S
 = saturation current, q = electronic charge, V
BE
 = voltage across the transistor 
base emitter junction (same nodes as VD), k = Boltzmann Constant, and T = absolute 
temperature (Kelvin).
6.
The series resistance, R
T,
 provided in the Diode Model Table (
more accurate readings as needed. 
The Intel Core2 Extreme processor X6800 and Intel Core2 Duo desktop processor 
E6000 and E4000 sequences do not support the diode correction offset that exists on 
other Intel processors.
5.4
Platform Environment Control Interface (PECI)
5.4.1
Introduction
PECI offers an interface for thermal monitoring of Intel processor and chipset 
components. It uses a single wire, thus alleviating routing congestion issues. 
 shows an example of the PECI topology in a system. PECI uses CRC 
checking on the host side to ensure reliable transfers between the host and client 
devices. Also, data transfer speeds across the PECI interface are negotiable within a 
wide range (2 Kbps to 2 Mbps). The PECI interface on the processor is disabled by 
default and must be enabled through BIOS. More information on this can be found in 
the Conroe BIOS Writer’s Guide.
Table 5-6.
Thermal “Diode” Parameters using Transistor Model
Symbol
Parameter
Min
Typ
Max
Unit
Notes
I
FW
Forward Bias Current
5
200
µA
1, 2
I
E
Emitter Current
5
200
n
Q
Transistor Ideality
0.997
1.001
1.005
-
3, 4, 5
Beta
0.391
0.760
3, 4
R
T
Series Resistance
2.79
4.52
6.24
Ω
3, 6
Table 7.
Thermal Diode Interface
Signal Name
Land Number
Signal 
Description
THERMDA
AL1
diode anode
THERMDC
AK1
diode cathode