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參數(shù)資料
| 型號： | LM75BGD |
| 廠商： | NXP Semiconductors N.V. |
| 元件分類： | 溫度/濕度傳感器 |
| 英文描述： | Digital temperature sensor and thermal watchdog |
| 封裝： | LM75BD<SOT96-1 (SO8)|<<http://www.nxp.com/packages/SOT96-1.html<1<Always Pb-free,;LM75BD<SOT96-1 (SO8)|<<http://www.nxp.com/packages/SOT96-1.html<1<Always Pb-free,; |
| 文件頁數(shù)： | 16/29頁 |
| 文件大?。?/td> | 164K |
| 代理商： | LM75BGD |
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LM75B_2
NXP B.V. 2008. All rights reserved.
Product data sheet
Rev. 02 — 9 December 2008
16 of 29
NXP Semiconductors
LM75B
Digital temperature sensor and thermal watchdog
[5]
The LM75B performs the temperature-to-data conversions with a much higher speed than the LM75A. While the LM75A takes almost
the whole of conversion period (T
conv
) time of about 100 ms to complete a conversion, the LM75B takes only about
1
10
of the period, or
about 10 ms. Therefore, the conversion period (T
conv
) is the same, but the temperature conversion time (t
conv(T)
) is different between the
two parts. A shorter conversion time is applied to significantly reduce the device’s average power dissipation. During each conversion
period, when the conversion is completed, the LM75B becomes idled and the power is reduced, resulting in a lesser average power
consumption.
8.3 Temperature accuracy
Because the local channel of the temperature sensor measures its own die temperature
that is transferred from its body, the temperature of the device body must be stabilized and
saturated for it to provide the stable readings. Because the LM75B operates a a low power
level, the thermal gradient of the device package has a minor effect on the measurement.
The accuracy of the measurement is more dependent upon the definition of the
environment temperature, which is affected by different factors: the printed-circuit board
on which the device is mounted; the air flow contacting the device body (if the ambient air
temperature and the printed-circuit board temperature are much different, then the
measurement may not be stable because of the different thermal paths between the die
and the environment). The stabilized temperature liquid of a thermal bath will provide the
best temperature environment when the device is completely dipped into it. A thermal
probe with the device mounted inside a sealed-end metal tube located in consistent
temperature air also provides a good method of temperature measurement.
8.4 Noise effect
The LM75B device design includes the implementation of basic features for a good noise
immunity:
The low-pass filter on both the bus pins SCL and SDA;
The hysteresis of the threshold voltages to the bus input signals SCL and SDA, about
500 mV minimum;
All pins have ESD protection circuitry to prevent damage during electrical surges. The
ESD protection on the address, OS, SCL and SDA pins it to ground. The latch-back
based device breakdown voltage of address/OS is typically 11 V and SCL/SDA is
typically 9.5 V at any supply voltage but will vary over process and temperature. Since
there are no protection diodes from SCL or SDA to V
CC
, the LM75B will not hold the
I
2
C lines LOW when V
CC
is not supplied and therefore allow continued I
2
C-bus
operation if the LM75B is de-powered.
However, good layout practices and extra noise filters are recommended when the device
is used in a very noisy environment:
Use decoupling capacitors at V
CC
pin.
Keep the digital traces away from switching power supplies.
Apply proper terminations for the long board traces.
Add capacitors to the SCL and SDA lines to increase the low-pass filter
characteristics.
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|---|---|
| LM75BGD,125 | 功能描述:板上安裝溫度傳感器 2.8-5.5V I2C-BUS INTERFACE 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 |
| LM75BGD125 | 制造商:NXP Semiconductors 功能描述:DIGITAL TEMP SENSOR IC 11BIT +/-3C XS |
| LM75BIM-3 | 功能描述:板上安裝溫度傳感器 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 |
| LM75BIM-3/NOPB | 功能描述:板上安裝溫度傳感器 Digital Temp Sensor 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 |
| LM75BIM-3+ | 功能描述:板上安裝溫度傳感器 2-Wire Digital Temp Snsr & Thrml Wtchdog 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 |
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