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參數(shù)資料
| 型號： | ASC7531BM10 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 元件分類： | 溫度/濕度傳感器 |
| 英文描述： | LOW-VOLTAGE 1-WIRE DIGITAL TEMPERATURE SENSOR AND VOLTAGE MONITOR |
| 中文描述： | 低電壓1 - Wire數(shù)字溫度傳感器和電壓監(jiān)測 |
| 文件頁數(shù)： | 14/18頁 |
| 文件大?。?/td> | 196K |
| 代理商： | ASC7531BM10 |
Applications Information
Remote Diodes
- 14 -
Andigilog, Inc. 2006
www.andigilog.com
December 2006 - 70A05012
aSC7531A
The aSC7531 is designed to work with a variety of remote
sensors in the form of a diode-connected transistor or the
substrate thermal diode of a CPU or graphics controller.
Actual diodes are not suited for these measurements.
There is some variation in the performance of these diodes,
described in terms of its departure from the ideal diode
equation. This factor is called diode non-ideality,
.
nf
The equation relating diode temperature to a change in
thermal diode voltage with two driving currents is:
Δ
V
BE
=
(nf )KT
q
ln(N)
where:
nf
= diode-connected 2N3904 or CPU substrate non-ideality
factor.
K
= Boltzman’s constant, (1.38 x 10
-23
).
T
= diode junction temperature in Kelvins.
q
= electron charge (1.6 x 10
Coulombs).
N
= ratio of the two driving currents (10).
The aSC7531A is designed and trimmed for an expected
value of 1.0046, based on the typical value for the 2N3904.
There is also a tolerance on the value provided.
gives a representative sample of what one may expect in the
range of non-ideality.
nf
Table 6
For the aSC7531A, when thermal diode has a non-ideality
factor other than 1.0046 the difference in temperature
reading at a particular temperature may be interpreted with
the following equation:
=
actual
n
reported
T
actual
T
0046
.
where:
T
reported
T
n
Temperatures are in Kelvins or °C + 273.15.
= reported temperature in temperature register.
actual
= actual remote diode temperature.
= selected diode’s non-ideality factor,
actual
.
nf
This equation assumes that the series resistance of the
remote diode 0.6
.
Although the temperature error caused by non-ideality
difference is directly proportional to the difference from
1.0046, a small difference in non-ideality results in a
relatively large difference in temperature reading. For
example, if there were a ±1% tolerance in the non-Ideality of
a diode it would result in a ±2.7 degree difference (at 0°C) in
the result (0.01 x 273.15).
The aSC7531B is designed and trimmed for an expected
value of 1.009, based on the typical value for the 65nM
Pentium CPU. There is also a tolerance on the value
provided. The values for CPUs may have different nominal
values and tolerances. Consult the CPU or GPU
manufacturer’s data sheet for the
representative sample of what one may expect in the range
of non-ideality. The trend with CPUs is for a lower value with
a larger spread.
factor.
nf
nf
Table 6 gives a
When thermal diode has a non-ideality factor other than
1.009 the difference in temperature reading at a particular
temperature may be interpreted with the following equation:
T
actual
=
T
reported
1.009
n
actual
where:
T
reported
T
n
Temperatures are in Kelvins or °C + 273.15.
= reported temperature in temperature register.
actual
= actual remote diode temperature.
= selected diode’s non-ideality factor,
actual
.
nf
This equation assumes that the series resistance of the
remote diode 4.52
.
Although the temperature error caused by non-ideality
difference is directly proportional to the difference from 1.009,
but a small difference in non-ideality results in a relatively
large difference in temperature reading. For example, if there
were a ±1% tolerance in the non-Ideality of a diode it would
result in a ±2.7 degree difference (at 0°C) in the result (0.01 x
273.15).
This difference varies with temperature such that a fixed
offset value may only be used over a very narrow range.
Typical correction method required when measuring a wide
range of temperature values is to scale the temperature
reading in the host firmware.
Part
nf
Min
nf
Nom
nf
Max
Series
Res
Pentium III
(CPUID 68h)
Pentium 4,
130nM
Pentium 4, 90nM
Pentium 4, 65nM
Intel Pentium M
2N3904
1.0057
1.008
1.0125
1.001
1.002
1.003
3.64
1.011
1.009
1.0022
1.0046
3.33
4.52
3.06
0.6
1.000
1.0015
1.003
1.050
1.0029
1.005
Table 6 Representative CPU Thermal Diode and
Transistor Non-Ideality Factors
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