243658-020 Datasheet, PDF (68/128 Pages) Intel Corporation – Intel Celeron Processor up to 1.10 GHz

Intel^® Celeron^® Processor up to 1.10 GHz
4.1.1
Thermal Diode
The Celeron processor incorporates an on-die diode that can be used to monitor the die
temperature. A thermal sensor located on the motherboard or a standalone measurement kit may
monitor the die temperature of the Intel Celeron processor for thermal management purposes.
Table 42 to Table 44 provide the diode parameter and interface specifications.
Note:
The reading of the thermal sensor connected to the thermal diode will not necessarily reflect the
temperature of the hottest location on the die. This is due to inaccuracies in the thermal sensor, on-
die temperature gradients between the location of the thermal diode and the hottest location on the
die at a given point in time, and time based variations in the die temperature measurement. Time
based variations can occur when the sampling rate of the thermal diode (by the thermal sensor) is
slower than the rate at which the T_junction temperature can change.
Table 42. Thermal Diode Parameters (S.E.P. and PPGA Packages)
Symbol
I_{forward bias}
n_ideality
Min
5
1.0000
Typ
1.0065
Max
500
1.0173
Unit
Notes
uA 1
2,3
NOTES:
1. Intel does not support or recommend operation of the thermal diode under reverse bias.
2. At room temperature with a forward bias of 630 mV.
3. n_ideality is the diode ideality factor parameter, as represented by the diode equation:
I-Io(e (Vd*q)/(nkT) – 1).
4. Not 100% tested. Specified by design characterization.
Table 43. Thermal Diode Parameters (FC-PGA/FC-PGA2 Packages)
Symbol
Min
Typ
Max Unit
Notes
I_{forward bias}
n_ideality
5
1.0057
1.0080
300
1.0125
uA 1
2, 3
NOTES:
1. Intel does not support or recommend operation of the thermal diode under reverse bias.
2. Characterized at 100° C with a forward bias current of 5–300 µA.
3. The ideality factor, n, represents the deviation from ideal diode behavior as exemplified by the diode
equation:
I_fw=Is(e^ ((Vd*q)/(nkT)) – 1), where Is = saturation current, q = electronic charge, Vd = voltage across the
diode, k = Boltzmann Constant, and T = absolute temperature (Kelvin).
4. Not 100% tested. Specified by design characterization.
Table 44. Thermal Diode Interface
Pin Name
SC242 Connector
Signal #
THERMDP
B14
THERMDN
B15
370-Pin Socket Pin #
Pin Description
AL31
AL29
diode anode (p junction)
diode cathode (n junction)
68
Datasheet