參數(shù)資料
型號(hào)： ADM1031ARQZ
廠商： ANALOG DEVICES INC
元件分類： 溫度/濕度傳感器
英文描述： DIGITAL TEMP SENSOR-SERIAL, 8BIT(s), 3Cel, RECTANGULAR, SURFACE MOUNT
封裝： LEAD FREE, MO-137AB, QSOP-16
文件頁(yè)數(shù)： 5/36頁(yè)
文件大?。?/td> 596K
代理商： ADM1031ARQZ
ADM1031
Rev. B | Page 13 of 36
To prevent ground noise interfering with the measurement, the
more negative terminal of the sensor is not referenced to
ground, but biased above ground by an internal diode at the
D– input. If the sensor is used in a very noisy environment, a
capacitor of value up to 1000 pF can be placed between the
D+ and D– inputs to filter the noise.
To measure ΔVΒΕ, the sensor is switched between operating
currents of I and N × I. The resulting waveform is passed
through a 65 kHz low-pass filter to remove noise, then to a
chopper-stabilized amplifier that performs the functions of
amplification and rectification of the waveform to produce a dc
voltage proportional to ΔVBE. This voltage is measured by the
ADC to give a temperature output in 11-bit twos complement
format. To further reduce the effects of noise, digital filtering is
performed by averaging the results of 16 measurement cycles.
An external temperature measurement nominally takes 9.6 ms.
LAYOUT CONSIDERATIONS
Digital boards can be electrically noisy environments and care
must be taken to protect the analog inputs from noise,
particularly when measuring the very small voltages from a
remote diode sensor. The following precautions should be taken:
1.
Place the ADM1031 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 4 to 8 inches.
2.
Route the D+ and D– 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. Ten mil track minimum width and spacing is
recommended.
10MIL
GND
D+
GND
D–
02402-020
Figure 20. Arrangement of Signal Tracks
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 D+ and
D– path and at the same temperature.
Thermocouple effects should not be a major problem as 1°C
corresponds to about 200 μV, and thermocouple voltages are
about 3 μV/°C of temperature difference. Unless there are two
thermocouples with a big temperature differential between
them, thermocouple voltages should be much less than 200 μV.
5.
Place a 0.1 μF bypass capacitor close to the ADM1031.
6.
If the distance to the remote sensor is more than 8 inches,
the use of twisted pair cable is recommended. This works
up to about 6 to 12 feet.
7.
For extra long distances (up to 100 feet), use a shielded
twisted pair cable, such as the Belden #8451 microphone
cable. Connect the twisted pair to D+ and D– and the
shield to GND close to the ADM1031. 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 C1
can be reduced or removed. In any case the total shunt
capacitance should not exceed 1000 pF.
Cable resistance can also introduce errors. One ohm series
resistance introduces about 0.5°C error.
ADDRESSING THE DEVICE
ADD (Pin 13) is a three-state input. It is sampled, on power-up
to set the lowest two bits of the serial bus address. Up to three
addresses are available to the systems designer via this address
pin. This reduces the likelihood of conflicts with other devices
attached to the system management bus.
THE INTERRUPT SYSTEM
The ADM1031 has two interrupt outputs, INT and THERM.
These have different functions. INT responds to violations of
software programmed temperature limits and is maskable.
THERM is intended as a “fail-safe” interrupt output that
cannot be masked. If the temperature is below the low
temperature limit, the INT pin is asserted low to indicate
an out-of-limit condition. If the temperature exceeds the high
temperature limit, the INT pin is also asserted low. A third
limit, THERM limit, can be programmed into the device to
set the temperature limit above which the overtemperature
THERM pin is asserted low. The behavior of the high limit
and THERM limit is as follows:
1.
Whenever the temperature measured exceeds the high
temperature limit, the INT pin is asserted low.
相關(guān)PDF資料
PDF描述
ADM1031ARQ DIGITAL TEMP SENSOR-SERIAL, 11BIT(s), 3Cel, RECTANGULAR, SURFACE MOUNT
ADRF6604ACPZ-R7 2500 MHz - 2900 MHz RF/MICROWAVE DOUBLE BALANCED MIXER
ADRF6801ACPZ-R7 750 MHz - 1150 MHz RF/MICROWAVE I/Q DEMODULATOR
ADT14GS-REEL ANALOG TEMP SENSOR-VOLTAGE, 2.49-2.52V, 3Cel, RECTANGULAR, SURFACE MOUNT
ADT42GRT ANALOG TEMP SENSOR-VOLTAGE, 0.75V, 3Cel, RECTANGULAR, SURFACE MOUNT
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
ADM1031ARQZ-R7 功能描述:IC SENSOR 2TEMP/FAN CTRL 16QSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 熱管理 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 功能:溫度監(jiān)控系統(tǒng)（傳感器） 傳感器類型:內(nèi)部和外部 感應(yīng)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(yuǎn)程（最大值） 拓?fù)?ADC，比較器，寄存器庫(kù) 輸出類型:2 線 SMBus? 輸出警報(bào):無(wú) 輸出風(fēng)扇:無(wú) 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(yīng)商設(shè)備封裝:SOT-23-8 包裝:Digi-Reel® 其它名稱:296-22675-6
ADM1031ARQZ-REEL 功能描述:板上安裝溫度傳感器 2 CH TDM PWM FAN CTRL IC 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
ADM1031ARQZ-REEL7 功能描述:IC SENSOR 2TEMP/FAN CTRL 16QSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 熱管理 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 功能:溫度監(jiān)控系統(tǒng)（傳感器） 傳感器類型:內(nèi)部和外部 感應(yīng)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(yuǎn)程（最大值） 拓?fù)?ADC，比較器，寄存器庫(kù) 輸出類型:2 線 SMBus? 輸出警報(bào):無(wú) 輸出風(fēng)扇:無(wú) 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(yīng)商設(shè)備封裝:SOT-23-8 包裝:Digi-Reel® 其它名稱:296-22675-6
ADM1032 制造商:AD 制造商全稱:Analog Devices 功能描述:+-1C Remote and Local System Temperature Monitor
ADM1032_12 制造商:ONSEMI 制造商全稱:ON Semiconductor 功能描述:1C Remote and Local System Temperature Monitor Supports SMBus Alert
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。

采購(gòu)需求

(若只采購(gòu)一條型號(hào)，填寫(xiě)一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

*型號(hào) *數(shù)量 廠商 批號(hào) 封裝
添加更多采購(gòu)

我的聯(lián)系方式

*
*
*