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參數(shù)資料
| 型號： | ADT7466 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | dBCool Remote Thermal Controller and Voltage Monitor |
| 中文描述： | dBCool遠(yuǎn)程熱控制器和電壓監(jiān)視器 |
| 文件頁數(shù)： | 19/48頁 |
| 文件大?。?/td> | 1269K |
| 代理商： | ADT7466 |
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ADT7466
All temperature limits must be programmed in the same format
as the temperature measurement. If this is offset binary, add 64
(0x40 or 01000000) to the actual temperature limit in degrees
Celsius.
Layout Considerations
Digital boards can be electrically noisy environments. Take the
following precautions to protect the analog inputs from noise,
particularly when measuring the very small voltages from a
remote diode sensor.
Rev. 0 | Page 19 of 48
Place the ADT7466 as close as possible to the remote sensing
diode. Provided that the worst noise sources, such as clock
generators, data/address buses and CRTs, are avoided, this
distance can be 4 inches to 8 inches.
If the distance to the remote sensor is more than 8 inches, the
use of twisted-pair cable is recommended. This works from
about 6 feet to 12 feet.
For very long distances (up to 100 feet), use shielded twisted
pair, such as Belden #8451 microphone cable. Connect the
twisted pair to D+ and D and the shield to GND close to the
ADT7466. Leave the remote end of the shield unconnected to
avoid ground loops.
Because the measurement technique uses switched current
sources, excessive cable and/or filter capacitance can affect the
measurement. When using long cables, the filter capacitor could
be reduced or removed.
Route the D+ and D tracks close together, in parallel, with
grounded guard tracks on each side. Provide a ground plane
under the tracks if possible.
Use wide tracks to minimize inductance and reduce noise
pickup. A 5 mil track minimum width and spacing is
recommended.
5MIL
5MIL
5MIL
5MIL
5MIL
5MIL
5MIL
GND
D+
GND
D–
0
Figure 25. Arrangement of Signal Tracks
Try to minimize the number of copper/solder joints, which can
cause thermocouple effects. Where copper/solder joints are
used, make sure that they are in both the D+ and D paths and
are at the same temperature.
Thermocouple effects should not be a major problem because
1°C corresponds to about 240 μV, and thermocouple voltages
two thermocouples with a big temperature differential between
them, thermocouple voltages should be much less than 200 mV.
Place a 0.1 μF bypass capacitor close to the ADT7466.
TEMPERATURE MEASUREMENT USING
THERMISTORS
The analog input channels, AIN1 and AIN2, can be used to
measure temperature by using negative temperature coefficient
(NTC) thermistors. NTC thermistors have a nonlinear transfer
function of the form
×
=
1
2
t1
t2
t
B
t
B
e
R
R
where:
R
t2
is the resistance at temperature
t2.
R
t1
is the resistance at temperature
t1
(usually 25°C).
e
= 2.71828.
B
is the B constant of the thermistor (typically between 3000
and 5000).
A thermistor can be made to give a voltage output that is fairly
linear over a limited range by making it part of a potential
divider as shown in Figure 26.
A potential divider, with a thermistor as the upper part
connected to REFOUT, produces an output voltage that varies
nonlinearly in proportion to the inverse of the resistance. By
suitable choice of thermistor and fixed resistor, this can be made
to approximately cancel the nonlinearity of the thermistor
resistance vs. temperature curve, thus giving a fairly linear
output voltage with temperature over a limited range. This
circuit uses REFOUT as the excitation voltage for both the
thermistor and for the ADC, so any variation in REFOUT is
cancelled, and the measurement is purely ratiometric.
0
TH1
REFOUT
TH2
ADT7466
TH2
R
EXT
2
TH1
R
EXT
1
Figure 26. Temperature Measurement Using Thermistor
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