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參數(shù)資料
| 型號： | LM64 |
| 廠商： | National Semiconductor Corporation |
| 元件分類： | 溫度/濕度傳感器 |
| 英文描述： | 【1∑C Remote Diode Temperature Sensor with PWM Fan Control and 5 GPIO’s |
| 中文描述： | 【1ΣC遠(yuǎn)程二極管溫度傳感器，PWM風(fēng)扇控制和5個GPIO的 |
| 文件頁數(shù)： | 27/29頁 |
| 文件大?。?/td> | 363K |
| 代理商： | LM64 |
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3.0 Application Notes
(Continued)
For example, if a processor manufacturer specifies a
±
0.1%
variation in
η
from part to part. As an example, assume that
a temperature sensor has an accuracy specification of
±
1C
at room temperature of 25C. 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 LM64 is calibrated for a MMBT3904 diode-connected
transistor.
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
HEX
and 47
HEX
count the num-
ber of periods of the 90 kHz tachometer clock in the LM64 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
27
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