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| 型号： | LM89CIM/NOPB |
| 厂商： | National Semiconductor |
| 文件页数： | 15/32页 |
| 文件大小： | 0K |
| 描述： | IC TEMP SENSOR DGTL 8-SOIC |
| 标准包装： | 95 |
| 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 ~ 125°C |
| 精确度： | ±3°C（最小值） |
| 拓扑： | ADC（三角积分型），比较器，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 ~ 3.6 V |
| 工作温度： | 0°C ~ 125°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 |
| 配用： | LM89EVAL-ND - BOARD EVALUATION LM89 |
| 其它名称： | LM89CIM |
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SNIS128C – AUGUST 2002 – REVISED MARCH 2013
SERIAL INTERFACE RESET
In the event that the SMBus Master is RESET while the LM89 is transmitting on the SMBData line, the LM89
must be returned to a known state in the communication protocol. This may be done in one of two ways:
1. When SMBData is LOW, the LM89 SMBus state machine resets to the SMBus idle state if either SMBData
or SMBCLK are held low for more than 35ms (t TIMEOUT ). Note that according to SMBus specification 2.0 all
devices are to timeout when either the SMBCLK or SMBData lines are held low for 25-35ms. Therefore, to
insure a timeout of all devices on the bus the SMBCLK or SMBData lines must be held low for at least 35ms.
2. When SMBData is HIGH, have the master initiate an SMBus start. The LM89 will respond properly to an
SMBus start condition at any point during the communication. After the start the LM89 will expect an SMBus
address byte.
DIGITAL FILTER
In order to suppress erroneous remote temperature readings due to noise, the LM89 incorporates a user-
configured digital filter. The filter is accessed in the FILTER and ALERT CONFIGURE REGISTER at BFh. The
filter can be set according to the following table.
D2
0
0
1
1
D1
0
1
0
1
Filter
No Filter
Level 1
Level 1
Level 2
Level 2 sets maximum filtering.
Figure 12 depicts the filter output in response to a step input and an impulse input. Figure 13 depicts the digital
filter in use in a Pentium 4 processor system. Note that the two curves, with filter and without, have been
purposely offset so that both responses can be clearly seen. Inserting the filter does not induce an offset as
shown.
Figure 11. Filter Output Response to a Step Input
a) Step Response
Figure 12. Filter Output Response to a Step Input
b) Impulse Response
Copyright ? 2002–2013, Texas Instruments Incorporated
Product Folder Links: LM89
15
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LM89CIMX | 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 |
| LM89CIMX/NOPB | 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 |
| LM89EVAL | 功能描述:温度传感器开发工具 LM89 EVAL KIT RoHS:否 制造商:Texas Instruments 产品类型:Temperature Sensors and Control ICs 工具用于评估:MSP430G2553 接口类型:USB 工作电源电压: 工作电源电流: |
| LM8M.5M.5 | 制造商:Banner Engineering 功能描述:LM8M.5M.5 LOGIC MODULE |
| LM8M64 | 制造商:SHARP 制造商全称:Sharp Electrionic Components 功能描述:Color STN LCD Module |
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