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參數(shù)資料
| 型號： | LM63CIMAX |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 溫度/濕度傳感器 |
| 英文描述： | 【1C/【3C Accurate Remote Diode Digital Temperature Sensor with Integrated Fan Control |
| 中文描述： | DIGITAL TEMP SENSOR-SERIAL, 11BIT(s), 3Cel, RECTANGULAR, SURFACE MOUNT |
| 封裝： | 0.154 INCH, MS-012, SOIC-8 |
| 文件頁數(shù)： | 26/28頁 |
| 文件大小： | 339K |
| 代理商： | LM63CIMAX |
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3.0 Application Notes
(Continued)
Pentium 4 processor’s thermal diode. The non-ideality factor,
η
, is the only other parameter not accounted for and de-
pends on the diode that is used for measurement. Since
V
be
is proportional to both
η
and T, the variations in
η
cannot be distinguished from variations in temperature.
Since the temperature sensor does not control the non-
ideality factor, it will directly add to the inaccuracy of the
sensor.
For the Intel Pentium 4 and Mobile Pentium 4 Processor-M
processors Intel specifies a
±
0.1% variation in
η
from part to
part. As an example, assume that a temperature sensor has
an accuracy specification of
±
1%C at room temperature of
25C and process used to manufacture the diode has a
non-ideality variation of
±
0.1%. The resulting accuracy will
be:
T
ACC
=
±
1C + (
±
0.1% of 298K) =
±
1.3C
The additional inaccuracy in the temperature measurement
caused by
η
, can be eliminated if each temperature sensor is
calibrated with the remote diode that it will be paired with-
.Refer to the processor datasheet for the non-ideality factor.
3.3.2 Compensating for Diode Non-Ideality
In order to compensate for the errors introduced by non-
ideality, the temperature sensor is calibrated for a particular
processor. National Semiconductor temperature sensors are
always calibrated to the typical non-ideality of a particular
processor type.
The LM63 is calibrated for the non-ideality of the 0.13 micron
Intel Pentium 4 and Mobile Pentium 4 Processor-M proces-
sors.
When a temperature sensor, calibrated for a specific type of
processor is used with a different processor type or a given
processor type has a non-ideality that strays form the typical
value, errors are introduced.
Temperature errors associated with non-ideality may be in-
troduced in a specific temperature range of concern through
the use of the Temperature Offset Registers 11
HEX
and
12
HEX
.
The
user
is
encouraged
hardware.monitor.team
@
nsc.com
to further request infor-
mation on our recommended setting of the offset register for
different processor types.
to
send
an
e-mail
to
3.4 COMPUTING RPM OF THE FAN FROM THE TACH
COUNT
The Tach Count Registers 46
and 47
count the num-
ber of periods of the 90 kHz tachometer clock in the LM63 for
the tachometer input from the fan assuming a 2 pulse per
revolution fan tachometer, such as the fans supplied with the
Pentium 4 boxed processors. The RPM of the fan can be
computed from the Tach Count Registers 46
HEX
and 47
HEX
.
This can best be shown through an example.
Example:
Given: the fan used has a tachometer output with 2 per
revolution.
Let:
Register 46 (LSB) is BF
HEX
= Decimal (11 x 16) + 15 = 191
and
Register 47 (MSB) is 7
HEX
= Decimal (7 x 256) = 1792.
The total Tach Count, in decimal, is 191 + 1792 =
1983
.
The RPM is computed using the formula
where
f = 1 for 2 pulses/rev fan tachometer output;
f = 2 for 1 pulse/rev fan tachometer output, and
f = 2 / 3 for 3 pulses/rev fan tachometer output
For our example
L
www.national.com
26
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LM63CIMAX/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(guān)閉: 安裝風格: 封裝 / 箱體: 設(shè)備功能:Temperature and Humidity Sensor |
| LM63DIMA | 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(guān)閉: 安裝風格: 封裝 / 箱體: 設(shè)備功能:Temperature and Humidity Sensor |
| LM63DIMA/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(guān)閉: 安裝風格: 封裝 / 箱體: 設(shè)備功能:Temperature and Humidity Sensor |
| LM63DIMAX | 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(guān)閉: 安裝風格: 封裝 / 箱體: 設(shè)備功能:Temperature and Humidity Sensor |
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