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參數(shù)資料
| 型號(hào)： | ADT7482ARMZ-RL |
| 廠商： | ON SEMICONDUCTOR |
| 元件分類： | 溫度/濕度傳感器 |
| 英文描述： | DIGITAL TEMP SENSOR-SERIAL, 11BIT(s), 2.5Cel, SQUARE, SURFACE MOUNT |
| 封裝： | LEAD FREE, MO-187-BA, MSOP-10 |
| 文件頁數(shù)： | 16/24頁 |
| 文件大?。?/td> | 335K |
| 代理商： | ADT7482ARMZ-RL |
ADT7482
Rev. 1 | Page 23 of 24 | www.onsemi.com
above ambient. However, the current forced through the remote
sensor is so small that self-heating is negligible. In the case of
the ADT7482, the worst-case condition occurs when the device
is converting at 64 conversions per second while sinking the
maximum current of 1 mA at the ALERT and THERM output.
In this case, the total power dissipation in the device is about
4.5 mW. The thermal resistance, θJA, of the MSOP-10 package is
about 142°C/W.
LAYOUT CONSIDERATIONS
Digital boards can be electrically noisy environments, and the
ADT7482 is measuring very small voltages from the remote
sensor, so care must be taken to minimize noise induced at the
sensor inputs. Take the following precautions:
Place the ADT7482 as close as possible to the remote
sensing diode. Provided that the worst noise sources, that
is, clock generators, data/address buses, and CRTs, are
avoided, this distance can be 4 inches to 8 inches.
Route the D+ and D– tracks close together, in parallel, with
grounded guard tracks on each side. To minimize
inductance and reduce noise pick-up, a 5 mil track width
and spacing is recommended. Provide a ground plane
under the tracks,if possible.
5MIL
GND
D+
D–
GND
061
50-
024
Figure 24. Typical Arrangement of Signal Tracks
Try to minimize the number of copper/solder joints that
can cause thermocouple effects. Where copper/solder
joints are used, make sure that they are in both the D+ and
D path and at the same temperature.
Thermocouple effects should not be a major problem as
1°C corresponds to about 200 mV, and thermocouple
voltages are about 3 mV/°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 VDD pin. In
extremely noisy environments, an input filter capacitor can
be placed across D+ and D, close to the ADT7482. This
capacitance can effect the temperature measurement, so
care must be taken to ensure that any capacitance seen at
D+ and D is a maximum of 1000 pF. This maximum
value includes the filter capacitance, plus any cable or stray
capacitance between the pins and the sensor diode.
If the distance to the remote sensor is more than 8 inches,
the use of twisted pair cable is recommended. A total of 6
feet to 12 feet is needed.
For long distances (up to 100 feet), use shielded twisted
pair, such as Belden No. 8451 microphone cable. Connect
the twisted pair to D+ and D and the shield to GND close
to the ADT7482. Leave the remote end of the shield
unconnected to avoid ground loops.
Because the measurement technique uses switched current
sources, excessive cable or filter capacitance can affect the
measurement. When using long cables, the filter capacitance
can be reduced or removed.
APPLICATION CIRCUIT
Figure 25 shows a typical application circuit for the ADT7482,
using discrete sensor transistors. The pull-ups on SCLK,
SDATA, and ALERT are required only if they are not already
provided elsewhere in the system.
The SCLK pin and the SDATA pin of the ADT7482 can be
interfaced directly to the SMBus of an I/O controller, such as
the Intel 820 chipset.
5V OR 12V
SMBUS
CONTROLLER
FAN CONTROL
CIRCUIT
2N3904/06
OR
CPU THERMAL
DIODE
D1+
D1–
D2+
D2–
VDD
SCLK
SDATA
ALERT
THERM
GND
ADT7482
0.1μF
VDD
TYP 10k
FAN ENABLE
3V TO 3.6V
TYP 10k
061
50-
025
Figure 25. Typical Application Circuit
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| ADT7482ARMZ-RL7 | 功能描述:板上安裝溫度傳感器 2 CH TEMP SNSR/ALARM 2 WIRE SMBUS INTRFCE RoHS:否 制造商:Omron Electronics 輸出類型:Digital 配置: 準(zhǔn)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(fēng)格: 封裝 / 箱體: 設(shè)備功能:Temperature and Humidity Sensor |
| ADT7483A | 制造商:AD 制造商全稱:Analog Devices 功能描述:Dual Channel Temperature Sensor and Over Temperature Alarm |
| ADT7483AARQZ | 功能描述:板上安裝溫度傳感器 2 TEMP DIODE MONITOR 2 WIRE SMBUS INTRFCE RoHS:否 制造商:Omron Electronics 輸出類型:Digital 配置: 準(zhǔn)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(fēng)格: 封裝 / 箱體: 設(shè)備功能:Temperature and Humidity Sensor |
| ADT7483AARQZ-R7 | 功能描述:板上安裝溫度傳感器 2 TEMP DIODE MONITOR 2 WIRE SMBUS INTRFCE RoHS:否 制造商:Omron Electronics 輸出類型:Digital 配置: 準(zhǔn)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(fēng)格: 封裝 / 箱體: 設(shè)備功能:Temperature and Humidity Sensor |
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