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參數(shù)資料
| 型號： | LM95213CISD |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 溫度/濕度傳感器 |
| 英文描述： | 2-Diode Input and Local Digital Temperature Sensor with Two-Wire Interface and TCRIT Outputs |
| 中文描述： | DIGITAL TEMP SENSOR-SERIAL, 11BIT(s), 2Cel, SQUARE, SURFACE MOUNT |
| 封裝： | LLP-14 |
| 文件頁數(shù)： | 30/34頁 |
| 文件大?。?/td> | 415K |
| 代理商： | LM95213CISD |
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FIGURE 8. Thermal Diode Current Paths
TruTherm technology can be found in the LM95233 two chan-
nel remote diode sensor that is pin and register compatible
with the LM95213. The LM95213 does ot support this tech-
nology.
3.1.2 Calculating Total System Accuracy
The voltage seen by the LM95213 also includes the I
R
volt-
age drop of the series resistance. The non-ideality factor,
η
,
is the only other parameter not accounted for and depends
on the diode that is used for measurement. Since
Δ
V
BE
is
proportional to both
η
and T, the variations in
η
cannot be
distinguished from variations in temperature. Since the non-
ideality factor is not controlled by the temperature sensor, it
will directly add to the inaccuracy of the sensor. For the for
Intel processor on 65 nm process, Intel specifies a +4.06%/
0.897% variation in
η
from part to part when the processor
diode is measured by a circuit that assumes diode equation,
Equation 4
, as true. As an example, assume a temperature
sensor has an accuracy specification of ±1.0°C at a temper-
ature of 80°C (353 Kelvin) and the processor diode has a non-
ideality variation of +1.19%/0.27%. The resulting system
accuracy of the processor temperature being sensed will be:
T
ACC
= + 1.0°C + (+4.06% of 353 K) = +15.3 °C
and
T
ACC
= - 1.0°C + (0.89% of 353 K) = 4.1 °C
The next error term to be discussed is that due to the series
resistance of the thermal diode and printed circuit board
traces. The thermal diode series resistance is specified on
most processor data sheets. For Intel processors in 65 nm
process, this is specified at 4.52
typical. The LM95213 ac-
commodates the typical series resistance of Intel Processor
on 65 nm process. The error that is not accounted for is the
spread of the processor's series resistance, that is 2.79
to
6.24
or ±1.73
. The equation to calculate the temperature
error due to series resistance (T
ER
) for the LM95213 is simply:
(6)
Solving
Equation 6
for R
equal to ±1.73
results in the
additional error due to the spread in the series resistance of
±1.07°C. The spread in error cannot be canceled out, as it
would require measuring each individual thermal diode de-
vice. This is quite difficult and impractical in a large volume
production environment.
Equation 6
can also be used to calculate the additional error
caused by series resistance on the printed circuit board. Since
the variation of the PCB series resistance is minimal, the bulk
of the error term is always positive and can simply be can-
celled out by subtracting it from the output readings of the
LM95213.
Processor Family
Diode Equation
η
D
, non-
ideality
typ
Series
R,
min
max
Pentium
III
CPUID 67h
Pentium III CPUID
68h/
PGA370Socket/
Celeron
Pentium 4, 423 pin
Pentium 4, 478 pin
Pentium 4 on 0.13
micron process, 2 -
3.06 GHz
Pentium 4 on 90 nm
process
Intel Processor on
65 nm process
Pentium M
(Centrino)
MMBT3904
AMD Athlon MP
model 6
AMD Athlon 64
AMD Opteron
AMD Sempron
1
1.0065
1.0125
1.0057
1.008
1.0125
0.9933
0.9933
1.0045
1.0045
1.0368
1.0368
1.0011
1.0021
1.0030
3.64
1.0083
1.011
1.023
3.33
1.000
1.009
1.050
4.52
1.00151
1.00220
1.00289
3.06
1.003
1.002
1.008
1.016
1.008
1.008
1.008
1.008
1.00261
1.096
1.096
0.93
3.1.3 Compensating for Different Non-Ideality
In order to compensate for the errors introduced by non-ide-
ality, the temperature sensor is calibrated for a particular
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LM95213CISD/NOPB | 功能描述:板上安裝溫度傳感器 RoHS:否 制造商:Omron Electronics 輸出類型:Digital 配置: 準(zhǔn)確性:+/- 1.5 C, +/- 3 C 溫度閾值: 數(shù)字輸出 - 總線接口:2-Wire, I2C, SMBus 電源電壓-最大:5.5 V 電源電壓-最小:4.5 V 最大工作溫度:+ 50 C 最小工作溫度:0 C 關(guān)閉: 安裝風(fēng)格: 封裝 / 箱體: 設(shè)備功能:Temperature and Humidity Sensor |
| LM95213CISDX | 功能描述:板上安裝溫度傳感器 RoHS:否 制造商:Omron Electronics 輸出類型:Digital 配置: 準(zhǔn)確性:+/- 1.5 C, +/- 3 C 溫度閾值: 數(shù)字輸出 - 總線接口:2-Wire, I2C, SMBus 電源電壓-最大:5.5 V 電源電壓-最小:4.5 V 最大工作溫度:+ 50 C 最小工作溫度:0 C 關(guān)閉: 安裝風(fēng)格: 封裝 / 箱體: 設(shè)備功能:Temperature and Humidity Sensor |
| LM95213CISDX/NOPB | 功能描述:板上安裝溫度傳感器 RoHS:否 制造商:Omron Electronics 輸出類型:Digital 配置: 準(zhǔn)確性:+/- 1.5 C, +/- 3 C 溫度閾值: 數(shù)字輸出 - 總線接口:2-Wire, I2C, SMBus 電源電壓-最大:5.5 V 電源電壓-最小:4.5 V 最大工作溫度:+ 50 C 最小工作溫度:0 C 關(guān)閉: 安裝風(fēng)格: 封裝 / 箱體: 設(shè)備功能:Temperature and Humidity Sensor |
| LM95213EB/NOPB | 功能描述:溫度傳感器開發(fā)工具 LM95213EVAL BOARD RoHS:否 制造商:Texas Instruments 產(chǎn)品類型:Temperature Sensors and Control ICs 工具用于評估:MSP430G2553 接口類型:USB 工作電源電壓: 工作電源電流: |
| LM95214 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Quad Remote Diode and Local Temperature Sensor with SMBus Interface |
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