- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄384601 > LM95214 (National Semiconductor Corporation) Quad Remote Diode and Local Temperature Sensor with SMBus Interface PDF資料下載
參數(shù)資料
| 型號： | LM95214 |
| 廠商： | National Semiconductor Corporation |
| 元件分類： | 溫度/濕度傳感器 |
| 英文描述： | Quad Remote Diode and Local Temperature Sensor with SMBus Interface |
| 中文描述： | 四遠程二極管與本地溫度傳感器，帶有SMBus接口 |
| 文件頁數(shù)： | 34/38頁 |
| 文件大?。?/td> | 448K |
| 代理商： | LM95214 |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁第31頁第32頁第33頁當前第34頁第35頁第36頁第37頁第38頁
30006115
FIGURE 9. Thermal Diode Current Paths
TruTherm technology can be found in the LM95234 four
channel remote diode sensor that is pin and register compat-
ible with the LM95214. The LM95214 does not support this
technology.
3.1.2 Calculating Total System Accuracy
The voltage seen by the LM95214 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 the MMBT3904 transistor,
this is specified at 0
typical. The LM95214 accommodates
the typical series resistance of a circuit with the offset register
compensation. The error that is not accounted for is the
spread of the thermal diodes series resistance. If a circuit has
a series resistance spread that is 2.79
to 6.24
or 4.515
±1.73
, the 4.515
can be cancelled out with the offset reg-
ister setting. The ±1.73
spread cannot be cancelled out. The
equation to calculate the temperature error due to series re-
sistance (T
ER
) for the LM95214 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 bulk of the error caused by the 4.515 ohms will
cause a positive offset in the temperature reading of 2.79°C
wich can be cancelled out by setting the offset register to
- 2.75°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
LM95214.
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
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
1.096
www.national.com
34
L
相關PDF資料 |
PDF描述 |
|---|---|
| LM95214CISD | Quad Remote Diode and Local Temperature Sensor with SMBus Interface |
| LM95214CISDX | Quad Remote Diode and Local Temperature Sensor with SMBus Interface |
| LM95221CIMM | Dual Remote Diode Digital Temperature Sensor with SMBus Interface |
| LM95221CIMMX | Dual Remote Diode Digital Temperature Sensor with SMBus Interface |
| LM95221 | Dual Remote Diode Digital Temperature Sensor with SMBus Interface |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| LM95214CISD | 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 關閉: 安裝風格: 封裝 / 箱體: 設備功能:Temperature and Humidity Sensor |
| LM95214CISD/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 關閉: 安裝風格: 封裝 / 箱體: 設備功能:Temperature and Humidity Sensor |
| LM95214CISDX | 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 關閉: 安裝風格: 封裝 / 箱體: 設備功能:Temperature and Humidity Sensor |
| LM95214CISDX/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 關閉: 安裝風格: 封裝 / 箱體: 設備功能:Temperature and Humidity Sensor |
| LM95214EB/NOPB | 功能描述:溫度傳感器開發(fā)工具 LM95214EVAL 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: |
發(fā)布緊急采購，3分鐘左右您將得到回復。