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| 型号： | ADT7486AARMZ-R7 |
| 厂商： | ON Semiconductor |
| 文件页数： | 10/14页 |
| 文件大小： | 369K |
| 描述： | IC TEMP SENS DGTL 2CH SST 10MSOP |
| 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： | 10-TFSOP，10-MSOP（0.118"，3.00mm 宽） |
| 供应商设备封装： | 10-MSOP |
| 包装： | 带卷 (TR) |
ADT7484A/ADT7486A
http://onsemi.com
10
Reading Temperature Measurements
The temperature measurement command codes are
detailed in Table 12. The temperature data returned is two
bytes in little endian format, that is, LSB before MSB. All
temperatures can be read together by using Command Code
0x00 with a read length of 0x04. The command codes and
returned data are described in Table 12.
Table 12. TEMPERATURE CHANNEL COMMAND
CODES
Temp
Channel
Command
Code
Returned Data
Internal
0x00
LSB, MSB
External 1
0x01
LSB, MSB
External 2
0x02
LSB, MSB
All Temps
0x00
Internal LSB, Internal MSB;
External 1 LSB, External 1 MSB;
External 2 LSB, External 2 MSB
SST Temperature Sensor Data Format
The data for temperature is structured to allow values in
the range of ?12癈 to be reported. Thus, the temperature
sensor format uses a twos complement, 16-bit binary value
to represent values in this range. This format allows
temperatures to be represented with approximately a
0.016癈 resolution.
Table 13. SST TEMPERATURE DATA FORMAT
Temperature (5C)
Twos Complement
MSB
LSB
125
1110 0000
1100 0000
80
1110 1100
0000 0000
40
1111 0110
0000 0000
20
1111 1011
0011 1110
5
1111 1110
1100 0000
1
1111 1111
1100 0000
0
0000 0000
0000 0000
+1
0000 0000
0100 0000
+5
0000 0001
0100 0000
+20
0000 0100
1100 0010
+40
0000 1010
0000 0000
+80
0001 0100
0000 0000
+125
0001 1111
0100 0000
Using Discrete Transistors
If a discrete transistor is used, the collector is not grounded
and should be linked to the base. If a PNP transistor is used,
the base is connected to the D1 input and the emitter is
connected to the D1+ input. If an NPN transistor is used, the
emitter is connected to the D1 input and the base is
connected to the D1+ input. Figure 17 shows how to connect
the ADT7484A/ADT7486A to an NPN or PNP transistor for
temperature measurement. To prevent ground noise from
interfering with the measurement, the more negative
terminal of the sensor is not referenced to ground, but is
biased above ground by an internal diode at the D1 input.
Figure 15. Connections for NPN and PNP Transistors
ADT7484A/
ADT7486A
D+
D
2N3904
NPN
ADT7484A/
ADT8486A
D+
D
2N3906
PNP
The ADT7484A/ADT7486A show 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 device 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 16. Arrangement of Signal Tracks
5 MIL
5 MIL
5 MIL
5 MIL
5 MIL
5 MIL
5 MIL
GND
D
D+
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
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ADT7486AARMZ-REEL | 制造商:AD 制造商全称:Analog Devices 功能描述:Digital Temperature Sensor with SST Interface |
| ADT7486AARMZ-REEL7 | 功能描述:IC TEMP SENS DGTL 2CH SST 10MSOP 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 |
| ADT7486AARMZ-RL | 功能描述:板上安装温度传感器 DGL TMP SNSR SST INF 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 |
| ADT7488A | 制造商:AD 制造商全称:Analog Devices 功能描述:SST Digital Temperature Sensor and Voltage Monitor |
| ADT7488AARMZ-REEL | 功能描述:IC TEMP SENSOR SST DGTL 10-MSOP 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 |
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