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参数资料
| 型号： | ADT7461ARZ |
| 厂商： | ON Semiconductor |
| 文件页数： | 8/20页 |
| 文件大小： | 268K |
| 描述： | IC TEMP MONITOR +/-1C DUAL 8SOIC |
| 产品变化通告： | MFG CHG Notification ADI to ON Semi Product Discontinuation 30/Sept/2011 |
| 标准包装： | 98 |
| 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： | 0°C ~ 127°C，-55°C ~ 150°C |
| 精确度： | ±3°C |
| 拓扑： | ADC，比较器，多路复用器，寄存器库 |
| 输出类型： | 2 线 SMBus? |
| 输出警报： | 是 |
| 输出风扇： | 是 |
| 电源电压： | 3 V ~ 5.5 V |
| 工作温度： | -40°C ~ 120°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： | 管件 |
| 产品目录页面： | 1129 (CN2011-ZH PDF) |
ADT7461
http://onsemi.com
8
Figure 15. Input Signal Conditioning
LOW-PASS FILTER
f
C
= 65 kHz
REMOTE
SENSING
TRANSISTOR
BIAS
DIODE
D+
D
V
DD
I
BIAS
I
N1 ?I
V
OUT+
V
OUT
To ADC
N2 ?I
C1*
*CAPACITOR C1 IS OPTIONAL. IT SHOULD ONLY BE USED IN NOISY ENVIRONMENTS.
Temperature Measurement Results
The results of the local and remote temperature
measurements are stored in the local and remote temperature
value registers and are compared with limits programmed
into the local and remote high and low limit registers.
The local temperature value is in Register 0x00 and has a
resolution of 1癈. The external temperature value is stored in
two registers, with the upper byte in Register 0x01 and the
lower byte in Register 0x10. Only the two MSBs in the external
temperature low byte are used. This gives the external
temperature measurement a resolution of 0.25癈. Table 6
shows the data format for the external temperature low byte.
Table 6. EXTENDED TEMPERATURE RESOLUTION
(REMOTE TEMPERATURE LOW BYTE)
Extended Resolution
Remote Temperature
Low Byte
0.00癈
0 000 0000
0.25癈
0 100 0000
0.50癈
1 000 0000
0.75癈
1 100 0000
When reading the full external temperature value, both the
high and low byte, the two registers should be read in
succession. Reading one register does not lock the other, so
both should be read before the next conversion finishes. In
practice, there is more than enough time to read both
registers, as transactions over the SMBus are significantly
faster than a conversion time.
Temperature Measurement Range
The temperature measurement range for both internal and
external measurements is, by default, 0癈 to +127癈.
However, the ADT7461 can be operated using an extended
temperature range. It can measure the full temperature range
of an external diode, from 55癈 to +150癈. The user can
switch between these two temperature ranges by setting or
clearing Bit 2 in the configuration register. A valid result is
available in the next measurement cycle after changing the
temperature range.
In extended temperature mode, the upper and lower
temperature that can be measured by the ADT7461 is
limited by the remote diode selection. The temperature
registers themselves can have values from 64癈 to +191癈.
However, most temperature sensing diodes have a
maximum temperature range of 55癈 to +150癈.
Above 150癈, they may lose their semiconductor
characteristics and approximate conductors instead. This
results in a diode short. In this case, a read of the temperature
result register gives the last good temperature measurement.
The user should be aware that the temperature measurement
on the external channel may not be accurate for temperatures
that are outside the operating range of the remote sensor.
While both local and remote temperature measurements
can be made while the part is in extended temperature mode,
the ADT7461 itself should not be exposed to temperatures
greater than those specified in the Absolute Maximum
Ratings section. Also, the device is guaranteed to operate only
as specified at ambient temperatures from 40癈 to +120癈.
Temperature Data Format
The ADT7461 has two temperature data formats. When the
temperature measurement range is from 0癈 to +127癈
(default), the temperature data format for both internal and
external temperature results is binary. When the measurement
range is in extended mode, an offset binary data format is used
for both internal and external results. Temperature values in
the offset binary data format are offset by 64癈. Examples of
temperatures in both data formats are shown in Table 7.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ADT7461ARZ | 制造商:ON Semiconductor 功能描述:TEMPERATURE SENSOR IC |
| ADT7461ARZ-REEL | 功能描述:板上安装温度传感器 1C TDM TMP RNG IC 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 |
| ADT7461ARZ-REEL7 | 功能描述:板上安装温度传感器 1C TDM TMP RNG IC 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 |
| ADT7462 | 制造商:AD 制造商全称:Analog Devices 功能描述:Flexible Temperature and Voltage Monitor and System Fan Controller |
| ADT7462ACPZ-500RL7 | 制造商:AD 制造商全称:Analog Devices 功能描述:Flexible Temperature and Voltage Monitor and System Fan Controller |
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