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| 型号： | ADT7484AARZ-RL7 |
| 厂商： | ON Semiconductor |
| 文件页数： | 11/14页 |
| 文件大小： | 369K |
| 描述： | IC TEMP SENSOR DGTL W/SST 8-SOIC |
| 产品变化通告： | MFG CHG Notification ADI to ON Semi Product Discontinuation 30/Sept/2011 |
| 标准包装： | 1,000 |
| 功能： | 温度监控系统（传感器） |
| 传感器类型： | 内部和外部 |
| 感应温度： | -40°C ~ 125°C，外部传感器 |
| 精确度： | ±1.75°C（最小值） |
| 拓扑： | ADC，多路复用器，寄存器库 |
| 输出类型： | Simple Serial Transport?（SST） |
| 输出警报： | 无 |
| 输出风扇： | 无 |
| 电源电压： | 3 V ~ 3.6 V |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 8-SOICN |
| 包装： | 带卷 (TR) |
ADT7484A/ADT7486A
http://onsemi.com
11
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
device.
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 D1+ and D1 and the shield to GND, close to
the device. 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 usin g long cables, the
filter capacitor can be reduced or removed. Cable resistance
can also introduce errors. A 1W series resistance introduces
about 0.5癈 error.
Temperature Offset
As CPUs run faster, it is more difficult to avoid high
frequency clocks when running the D1+ and D1 tracks
around a system board. Even when the recommended layout
guidelines are followed, there may still be temperature
errors, attributed to noise being coupled on to the D1+ and
D1 lines. High frequency noise generally has the effect of
producing temperature measurements that are consistently
too high by a specific amount. The ADT7484A/
ADT87486A have a 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 ADT7484A/ADT7486A. 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 13.
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.
Application Schematics
Figure 17. ADT7484A Typical Application Schematic
RESERVED
SST
ADD0
ADD1
V
CC
GND
D1+
D1
8
7
6
5
4
3
2
1
ADT7484A
SST
V
CC
2N3904
or
CPU
THERMAL
DIODE
Figure 18. ADT7486A Typical Application Schematic
RESERVED
SST
ADD0
ADD1
V
CC
GND
D1+
D1
10
9
8
7
4
3
2
1
ADT7486A
SST
V
CC
2N3904
NPN
D2
D2+
6
5
CPU
THERMAL
DIODE
Table 14. ORDERING INFORMATION
Device Order Number*
Branding
Package Option
Package Type
Shipping
ADT7484AARZREEL
R8
SOIC8 NB
2,500 Tape & Reel
ADT7484AARMZRL
T20
RM8
8-lead MSOP
3,000 Tape & Reel
ADT7486AARMZRL
T22
RM10
10-lead MSOP
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.
*These are Pb-Free packages.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ADT7484ARMZ-REEL | 功能描述:板上安装温度传感器 DIGITAL TEMP SENSOR W/SST INTERFACE RoHS:否 制造商:Omron Electronics 输出类型:Digital 配置: 准确性:+/- 1.5 C, +/- 3 C 温度阈值: 数字输出 - 总线接口:2-Wire, I2C, SMBus 电源电压-最大:5.5 V 电源电压-最小:4.5 V 最大工作温度:+ 50 C 最小工作温度:0 C 关闭: 安装风格: 封装 / 箱体: 设备功能:Temperature and Humidity Sensor |
| ADT7484ARMZ-REEL7 | 功能描述:IC TEMP SENSOR DGTL SST 8MSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 热管理 系列:- 标准包装:1 系列:- 功能:温度监控系统（传感器） 传感器类型:内部和外部 感应温度:-40°C ~ 125°C，外部传感器 精确度:±2.5°C 本地（最大值），±5°C 远程（最大值） 拓扑:ADC，比较器，寄存器库 输出类型:2 线 SMBus? 输出警报:无 输出风扇:无 电源电压:2.7 V ~ 5.5 V 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:SOT-23-8 供应商设备封装:SOT-23-8 包装:Digi-Reel® 其它名称:296-22675-6 |
| ADT7484ARMZ-RL7 | 功能描述:板上安装温度传感器 DIGITAL TEMP SENSOR W/SST INTERFACE RoHS:否 制造商:Omron Electronics 输出类型:Digital 配置: 准确性:+/- 1.5 C, +/- 3 C 温度阈值: 数字输出 - 总线接口:2-Wire, I2C, SMBus 电源电压-最大:5.5 V 电源电压-最小:4.5 V 最大工作温度:+ 50 C 最小工作温度:0 C 关闭: 安装风格: 封装 / 箱体: 设备功能:Temperature and Humidity Sensor |
| ADT7485A | 制造商:AD 制造商全称:Analog Devices 功能描述:SST Digital Temperature Sensor and Voltage Monitor |
| ADT7485AARMZ | 制造商: 功能描述: 制造商:undefined 功能描述: |
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