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參數(shù)資料
| 型號： | NE1617ADS,112 |
| 廠商： | NXP Semiconductors |
| 文件頁數(shù)： | 5/30頁 |
| 文件大?。?/td> | 305K |
| 描述： | IC TEMP MONITOR 16SSOP |
| 標準包裝： | 100 |
| 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： | -55°C ~ 125°C，外部傳感器 |
| 精確度： | ±3°C 本地（最大），±5°C 遠程（最大） |
| 拓撲： | ADC，多路復(fù)用器，寄存器庫 |
| 輸出類型： | SMBus? |
| 輸出警報： | 是 |
| 輸出風扇： | 無 |
| 電源電壓： | 3 V ~ 5.5 V |
| 工作溫度： | -55°C ~ 125°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 16-SSOP（0.154"，3.90mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 16-SSOP |
| 包裝： | 管件 |
| 其它名稱： | 935268119112 NE1617ADS NE1617ADS-ND |
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NE1617A
All information provided in this document is subject to legal disclaimers.
?NXP B.V. 2012. All rights reserved.
Product data sheet
Rev. 5 20 March 2012
5 of 30
NXP Semiconductors
NE1617A
Temperature monitor for microprocessor systems
7. Functional description
The NE1617A contains an integrating A-to-D converter, an analog multiplexer, a status
register, digital data registers, SMBus interface, associated control logic and a local
temperature sensor or channel (refer to Figure 1
Block diagram of NE1617A
). The
remote diode-type sensor or channel should be connected to the D+ and D- pins properly.
Temperature measurements or conversions are either automatically and periodically
activated when the device is in free-running mode (both STBY
pin = HIGH, and the
configuration register bit 6 = LOW) or generated by one-shot command. The free-running
period is selected by changing the programmable data of the conversion rate register, as
described in Section 8.3.4
. For each conversion, the multiplexer switches current sources
through the remote and local temperature sensors over a period of time, about 60 ms, and
the voltages across the diode-type sensors are sensed and converted into the
temperature data by the A-to-D converter. The resulting temperature data is then stored in
the temperature registers, in 8-bit two's complement word format and automatically
compared with the limits which have been programmed in the temperature limit registers.
Results of the comparison are reflected accordingly by the flags stored in the status
register, an out-of-limit condition will set the ALERT
output pin to its LOW state. Because
both channels are automatically measured for each conversion, the results are updated
for both channels at the end of every successful conversion.
7.1 Temperature measurement
The method of the temperature measurement is based on the change of the diode V
BE
at
two different operating current levels given by:
(1)
where:
DV
BE
= change in base emitter voltage drop at two current levels
n = non-ideality
K = Boltzmans constant
T = absolute temperature in ?Kelvin
q = charge on the electron
LN = natural logarithm
N = ratio of the two currents
The NE1617A forces two well-controlled current sources of about 10 mA and 100 mA and
measures the remote diode V
BE
. The sensed voltage between two pins D+ and D- is
limited between 0.25 V and 0.95 V. The external diode must be selected to meet this
voltage range at these two current levels and also the non-ideality factor n must be close
to the value of 1.008 to be compatible with the Intel Pentium III internal thermal diode that
the NE1617A was designed to work with. The diode-connected PNP transistor provided
on the microprocessor is typically used, or the discrete diode-connected transistor
2N3904 or 2N3906 is recommended as an alternative.
V
BE
n
KT
q
------ -
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
LN N
( )
?/DIV>
=
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| NE1617DS | 功能描述:板上安裝溫度傳感器 I2C LOC +/- 2OC AND REM +/- 3OC TS RoHS:否 制造商:Omron Electronics 輸出類型:Digital 配置: 準確性:+/- 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: 安裝風格: 封裝 / 箱體: 設(shè)備功能:Temperature and Humidity Sensor |
| NE1617DS,112 | 功能描述:板上安裝溫度傳感器 I2C LOC +/- 2OC AND RoHS:否 制造商:Omron Electronics 輸出類型:Digital 配置: 準確性:+/- 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: 安裝風格: 封裝 / 箱體: 設(shè)備功能:Temperature and Humidity Sensor |
| NE1617DS,118 | 功能描述:板上安裝溫度傳感器 I2C LOC +/- 2OC AND REM +/- 3OC TS RoHS:否 制造商:Omron Electronics 輸出類型:Digital 配置: 準確性:+/- 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: 安裝風格: 封裝 / 箱體: 設(shè)備功能:Temperature and Humidity Sensor |
| NE1618 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Temperature monitor for microprocessor systems |
| NE1618DS | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Temperature monitor for microprocessor systems |
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