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| 型號： | ADT7485AARMZ-R |
| 廠商： | ON Semiconductor |
| 文件頁數： | 11/12頁 |
| 文件大小： | 353K |
| 描述： | IC TEMP/VOLT DGL SENS SST 10MSOP |
| 產品變化通告： | MFG CHG Notification ADI to ON Semi |
| 標準包裝： | 3,000 |
| 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： | ±1.75°C（最小值） |
| 拓撲： | ADC，多路復用器，寄存器庫 |
| 輸出類型： | Simple Serial Transport?（SST） |
| 輸出警報： | 無 |
| 輸出風扇： | 無 |
| 電源電壓： | 3 V ~ 3.6 V |
| 工作溫度： | -40°C ~ 125°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 10-TFSOP，10-MSOP（0.118"，3.00mm 寬） |
| 供應商設備封裝： | 10-MSOP |
| 包裝： | 帶卷 (TR) |
ADT7485A
http://onsemi.com
11
Figure 16. Connections for NPN and PNP Transistors
ADT7485A
D1+
D1
2N3904
NPN
ADT7485A
D1+
D1
2N3906
PNP
The ADT7485A shows an external temperature value of
0x8000 if the external diode is an open or short circuit.
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:
1. Place the ADT7485A 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 four to eight inches.
2. Route the D1+ and D1 tracks close together in
parallel with grounded guard tracks on each side.
Provide a ground plane under the tracks if
possible.
3. Use wide tracks to minimize inductance and
reduce noise pickup. A 5 mil track minimum width
and spacing is recommended.
Figure 17. Arrangement of Signal Tracks
5 MIL
5 MIL
5 MIL
5 MIL
5 MIL
5 MIL
5 MIL
GND
D1
D1+
GND
4. 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 D1+ and D1 paths and
are at the same temperature.
5. Thermocouple effects should not be a major
problem because 1癈 corresponds to about
240 mV, and thermocouple voltages are about
3 mV/癈 of the temperature difference. Unless
there are two thermocouples with a big
temperature differential between them,
thermocouple voltages should be much less than
200 mV.
6. Place a 0.1 mF bypass capacitor close to the
ADT7485A.
7. If the distance to the remote sensor is more than
eight inches, the use of a twisted pair cable is
recommended. This works for distances of about
6 feet to 12 feet.
8. For very long distances (up to 100 feet), use
shielded twisted pair cables, such as Belden #8451
microphone cables. Connect the twisted pair cable
to D+ and D and the shield to GND, close to the
ADT7485A. 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 can be reduced or removed. Cable resistance
can also introduce errors. A 1 W series resistance introduces
about 0.5癈 error.
Temperature Offset
As CPUs run faster, it is more difficult to avoid high
frequency clocks when routing the D+ and D tracks around
a system board. Even when the recommended layout
guidelines are followed, there may still be temperature
errors, attributed to noise being coupled onto the D+ and D
lines. High frequency noise generally has the effect of
producing temperature measurements that are consistently
too high by a specific amount. The ADT7485A has
temperature offset command code of 0xe0 through which a
desired offset can be set. By doing a one-time calibration of
the system, the offset caused by system board noise can be
calculated and nulled by specifying it in the ADT7485A.
The offset is automatically added to every temperature
measurement. The maximum offset is ?28癈 with 0.25癈
resolution. The offset format is the same as the temperature
data format; 16-bit, twos complement notation, as shown in
Table 15. The offset should be programmed in little endian
format, that is, LSB before MSB. The offset value is also
returned in little endian format when read.
Table 16. ORDERING INFORMATION
Device Order Number*
Package Type
Package Option
Shipping
ADT7485AARMZR
10-lead MSOP
RM10
3,000 Tape & Reel
For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging
Specifications Brochure, BRD8011/D.
*This is Pb-Free package.
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相關代理商/技術參數 |
參數描述 |
|---|---|
| ADT7485AARMZ-R7 | 功能描述:板上安裝溫度傳感器 TMP SNSR/VLTG MON W/SST INTERFACE 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 |
| ADT7485AARMZ-REEL | 功能描述:IC TEMP/VOLT DIG SENSOR 10-MSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 熱管理 系列:- 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 |
| ADT7485AARMZ-REEL7 | 功能描述:IC TEMP/VOLT DGL SENS SST 10MSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 熱管理 系列:- 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 |
| ADT7486A | 制造商:AD 制造商全稱:Analog Devices 功能描述:Digital Temperature Sensor with SST Interface |
| ADT7486AARMZ-R7 | 功能描述:板上安裝溫度傳感器 DGL TMP SNSR SST INF 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 |
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