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| 型号： | LM89-1EVAL |
| 厂商： | National Semiconductor |
| 文件页数： | 8/32页 |
| 文件大小： | 0K |
| 描述： | BOARD EVALUATION LM89-1 |
| 标准包装： | 1 |
| 传感器类型： | 温度 |
| 传感范围： | 0°C ~ 125°C |
| 接口： | SMBus（2 线/I²C） |
| 灵敏度： | ±1°C |
| 电源电压： | 3 V ~ 3.6 V |
| 嵌入式： | 否 |
| 已供物品： | 板，CD |
| 已用 IC / 零件： | LM89-1 |
| 相关产品： | LM89-1CIMX-ND - IC TEMP SENSOR DGTL 8-SOIC LM89-1CIMM/NOPBTR-ND - IC TEMP SENSOR DGTL 8-MSOP LM89-1CIMMX/NOPBTR-ND - IC TEMP SENSOR DGTL 8-MSOP LM89-1CIM-ND - IC TEMP SENSOR DGTL 8-SOIC |
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SNIS128C – AUGUST 2002 – REVISED MARCH 2013
FUNCTIONAL DESCRIPTION
The LM89 temperature sensor incorporates a delta V BE based temperature sensor using a Local or Remote
diode and a 10-bit plus sign ADC (Delta-Sigma Analog-to-Digital Converter). The LM89 is compatible with the
serial SMBus version 2.0 two-wire interface. Digital comparators compare the measured Local Temperature (LT)
to the Local High (LHS), Local Low (LLS) and Local T_CRIT (LCS) user-programmable temperature limit
registers. The measured Remote Temperature (RT) is digitally compared to the Remote High (RHS), R emote
Low (RLS) and Remote T_CRIT (RCS) user-programmable temperature limit registers. Activation of the ALERT
output indicates that a comparison is greater than the limit preset in a T_CRIT or HIGH limit register or less than
the limit preset in a LOW limit register. The T_CRIT_A output responds as a true comparator with built in
hysteresis. The hysteresis is set by the value placed in the Hysteresis register (TH). Activation of T_CRIT_A
occurs when the temperature is above the T_CRIT setpoint. T_CRIT_A remains activated until the temperature
goes below the setpoint calculated by T_CRIT ? TH. The hysteresis register impacts both the remote
temperature and local temperature readings.
The LM89 may be placed in a low power consumption (Shutdown) mode by setting the RUN/STOP bit found in
the Configuration register. In the Shutdown mode, the LM89's SMBus interface remains while all circuitry not
required is turned off.
The Local temperature reading and setpoint data registers are 8-bits wide. The format of the 11-bit remote
temperature data is a 16-bit left justified word. Two 8-bit registers, high and low bytes, are provided for each
setpoint as well as the temperature reading. Two offset registers (RTOLB and RTOHB) can be used to
compensate for nonideality error, discussed further in DIODE NONIDEALITY . The remote temperature reading
reported is adjusted by subtracting from or adding to the actual temperature reading the value placed in the
offset registers.
CONVERSION SEQUENCE
The LM89 takes approximately 31.25 ms to convert the Local Temperature (LT), Remote Temperature (RT), and
to update all of its registers. Only during the conversion process the busy bit (D7) in the Status register (02h) is
high. These conversions are addressed in a round robin sequence. The conversion rate may be modified by the
Conversion Rate Register (04h). When the conversion rate is modified a delay is inserted between conversions,
the actual conversion time remains at 31.25ms. Different conversion rates will cause the LM89 to draw different
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0
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0.01
0.1
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CONVERSION RATE (Hz)
Figure 3. Conversion Rate Effect on Power Supply Current
8
Product Folder Links: LM89
Copyright ? 2002–2013, Texas Instruments Incorporated
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| LM8942 | 制造商:未知厂家 制造商全称:未知厂家 功能描述: |
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| LM89CIM | 制造商:Rochester Electronics LLC 功能描述: 制造商:Texas Instruments 功能描述: |
| LM89CIM/NOPB | 功能描述:IC TEMP SENSOR DGTL 8-SOIC 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 |
| LM89CIMM | 功能描述:板上安装温度传感器 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 |
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