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參數資料
| 型號： | ADT7466ARQZ-REEL7 |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 模擬信號調理 |
| 英文描述： | dBCool Remote Thermal Controller and Voltage Monitor |
| 中文描述： | SPECIALTY ANALOG CIRCUIT, PDSO16 |
| 封裝： | LEAD FREE, MO-137AB, QSOP-16 |
| 文件頁數： | 19/48頁 |
| 文件大小： | 1269K |
| 代理商： | ADT7466ARQZ-REEL7 |
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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
are about 3 μV/°C of temperature difference. Unless there are
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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相關代理商/技術參數 |
參數描述 |
|---|---|
| ADT7466ARQZ-RL7 | 功能描述:板上安裝溫度傳感器 RMT THRM CTR VLT MON 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 |
| ADT7466ZEVB | 功能描述:BOARD EVALUATION ADT7466 RoHS:是 類別:編程器，開發系統 >> 過時/停產零件編號 系列:dBCool® 標準包裝:1 系列:- 傳感器類型:CMOS 成像，彩色（RGB） 傳感范圍:WVGA 接口:I²C 靈敏度:60 fps 電源電壓:5.7 V ~ 6.3 V 嵌入式:否 已供物品:成像器板 已用 IC / 零件:KAC-00401 相關產品:4H2099-ND - SENSOR IMAGE WVGA COLOR 48-PQFP4H2094-ND - SENSOR IMAGE WVGA MONO 48-PQFP |
| ADT7467 | 制造商:AD 制造商全稱:Analog Devices 功能描述:dBCool Remote Thermal Monitor and Fan Controller |
| ADT7467ARQ | 功能描述:IC PWM FAN CTRLR W/MONITR 16QSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 熱管理 系列:dBCool® 標準包裝:1 系列:- 功能:溫度監控系統（傳感器） 傳感器類型:內部和外部 感應溫度:-40°C ~ 125°C，外部傳感器 精確度:±2.5°C 本地（最大值），±5°C 遠程（最大值） 拓撲:ADC，比較器，寄存器庫 輸出類型:2 線 SMBus? 輸出警報:無 輸出風扇:無 電源電壓:2.7 V ~ 5.5 V 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:SOT-23-8 供應商設備封裝:SOT-23-8 包裝:Digi-Reel® 其它名稱:296-22675-6 |
| ADT7467ARQ-REEL | 功能描述:IC REMOTE THERMAL CTRLR 16-QSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 熱管理 系列:dBCool® 標準包裝:1 系列:- 功能:溫度監控系統（傳感器） 傳感器類型:內部和外部 感應溫度:-40°C ~ 125°C，外部傳感器 精確度:±2.5°C 本地（最大值），±5°C 遠程（最大值） 拓撲:ADC，比較器，寄存器庫 輸出類型:2 線 SMBus? 輸出警報:無 輸出風扇:無 電源電壓:2.7 V ~ 5.5 V 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:SOT-23-8 供應商設備封裝:SOT-23-8 包裝:Digi-Reel® 其它名稱:296-22675-6 |
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