- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄384602 > LM95245CIMM (National Semiconductor Corporation) Precision Remote Diode Digital Temperature Sensor with TruTherm⑩ BJT Beta Compensation Technology for 45nm Process PDF資料下載
參數(shù)資料
| 型號(hào)： | LM95245CIMM |
| 廠商： | National Semiconductor Corporation |
| 元件分類： | 溫度/濕度傳感器 |
| 英文描述： | Precision Remote Diode Digital Temperature Sensor with TruTherm⑩ BJT Beta Compensation Technology for 45nm Process |
| 中文描述： | 高精度遠(yuǎn)程二極管數(shù)字溫度傳感器的45納米工藝的TruTherm⑩晶體管測(cè)試補(bǔ)償技術(shù) |
| 文件頁數(shù)： | 20/24頁 |
| 文件大?。?/td> | 342K |
| 代理商： | LM95245CIMM |
Unsigned Remote T_CRIT Limit - 0°C to 255°C
(Read/Write Address 19h):
D7
128
D6
64
D5
32
D4
16
D3
8
D2
4
D1
2
D0
1
Power on Reset default is 6Eh (110°C).
Common Hysteresis Register
(Read/Write Address 21h):
D7
0
D6
0
D5
0
D4
16
D3
8
D2
4
D1
2
D0
1
Power on Reset default is 0Ah (10°C).
2.6 IDENTIFICATION REGISTERS
Manufacturers ID Register
(Read Only Address FEh): Always returns 01h.
D7
D6
0
D5
0
D4
0
D3
0
D2
0
D1
0
D0
1
0
Revision ID Register
(Read Only Address FFh): Default is B3h. This register will increment by 1 every time there is a revision to the die by National
Semiconductor. The initial revision bits for B3h are shown below.
D7
D6
D5
D4
1
0
1
1
D3
0
D2
0
D1
1
D0
1
3.0 Applications Hints
The LM95245 can be applied easily in the same way as other
integrated-circuit temperature sensors, and its remote diode
sensing capability allows it to be used in new ways as well. It
can be soldered to a printed circuit board, and because the
path of best thermal conductivity is between the die and the
pins, its temperature will effectively be that of the printed cir-
cuit board lands and traces soldered to the LM95245's pins.
This presumes that the ambient air temperature is almost the
same as the surface temperature of the printed circuit board;
if the air temperature is much higher or lower than the surface
temperature, the actual temperature of the LM95245 die will
be at an intermediate temperature between the surface and
air temperatures. Again, the primary thermal conduction path
is through the leads, so the circuit board temperature will con-
tribute to the die temperature much more strongly than will the
air temperature.
To measure temperature external to the LM95245's die, use
a remote diode. This diode can be located on the die of a
target IC, allowing measurement of the IC's temperature, in-
dependent of the LM95245's temperature. A discrete diode
can also be used to sense the temperature of external objects
or ambient air. Remember that a discrete diode's temperature
will be affected, and often dominated, by the temperature of
its leads. Most silicon diodes do not lend themselves well to
this application. It is recommended that an MMBT3904 tran-
sistor base-emitter junction be used with the collector tied to
the base. Accuracy using the MMBT3904 is not guaranteed.
For applications requiring the use of the MMBT3904 use the
LM95235.
The LM95245's BJT Beta Compensation TruTherm technol-
ogy allows accurate sensing of integrated thermal diodes,
such as those found on most processors.
The LM95245 has been optimized to measure the remote
thermal diode integrated in a typical Intel processor on
45 nm, 65 nm or 90 nm process. Using the Remote Diode
Model Select register the remote inputs must be assigned to
sense a typical Intel processor on 45nm, 65 nm or 90 nm pro-
cess.
3.1 DIODE NON-IDEALITY
3.1.1 Diode Non-Ideality Factor Effect on Accuracy
When a transistor is connected as a diode, the following re-
lationship holds for variables V
BE
, T and I
F
:
(1)
where:
q = 1.6×10
19
Coulombs (the electron charge),
T = Absolute Temperature in Kelvin
k = 1.38×10
23
joules/K (Boltzmann's constant),
η
is the non-ideality factor of the process the diode is
manufactured on,
I
S
= Saturation Current and is process dependent,
I
f
= Forward Current through the base-emitter junction
V
BE
= Base-Emitter Voltage drop
www.national.com
20
L
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LM95245CIMM-1 | Precision Remote Diode Digital Temperature Sensor with TruTherm⑩ BJT Beta Compensation Technology for 45nm Process |
| LM95245CIMMX | Precision Remote Diode Digital Temperature Sensor with TruTherm⑩ BJT Beta Compensation Technology for 45nm Process |
| LM96011 | Hardware Monitor with Thermal Diode Input and SensorPath⑩ Bus |
| LM96194 | TruTherm⑩ Hardware Monitor with PI Fan Control for Workstation Management |
| LM96194CISQ | TruTherm⑩ Hardware Monitor with PI Fan Control for Workstation Management |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LM95245CIMM/NOPB | 功能描述:板上安裝溫度傳感器 TS W/ TRUTHERM FOR 45NM PROCESS 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 |
| LM95245CIMM-1 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Precision Remote Diode Digital Temperature Sensor with TruTherm㈢ BJT Beta Compensation Technology for 45nm Process |
| LM95245CIMM-1/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 |
| LM95245CIMMX | 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 |
| LM95245CIMMX/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 |
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。