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| 型号： | LM99 |
| 厂商： | National Semiconductor Corporation |
| 元件分类： | 温度/湿度传感器 |
| 英文描述： | 【1C Accurate, High Temperature, Remote Diode Temperature Sensor with Two-Wire Interface |
| 中文描述： | 【集成电路准确，高温，远程二极管温度传感器，两线接口 |
| 文件页数： | 1/20页 |
| 文件大小： | 349K |
| 代理商： | LM99 |
LM99
±1C Accurate, High Temperature, Remote Diode
Temperature Sensor with Two-Wire Interface
General Description
The LM99 is an 11-bit remote diode temperature sensor with
a 2-wire System Management Bus (SMBus) serial interface.
The LM99 accurately measures: (1) its own temperature and
(2) the temperature of a remote diode-connected transistor
such as the 2N3904 or a thermal diode commonly found on
Graphics Processor Units (GPU), Computer Processor Units
(CPU or other ASICs. The LM99 remote diode temperature
sensor shifts the temperature from the remote sensor down
16C and operates on that shifted temperature:
T
ACTUAL DIODE JUNCTION =TLM99 + 16C
The local temperature reading requires no offset.
The LM99 has an Offset Register which provides a means
for precise matching to various thermal diodes. Contact
hardware.monitor@nsc.com for the latest details.
The LM99 and LM99-1 have the same functions but different
SMBus slave addresses. This allows for one of each to be on
the same bus at the same time.
Activation of the ALERT output occurs when any tempera-
ture goes outside a preprogrammed window set by the HIGH
and LOW temperature limit registers or exceeds the T_CRIT
temperature limit. Activation of the T_CRIT_A occurs when
any temperature exceeds the T_CRIT programmed limit.
Features
n
Accurately senses the temperature of remote diodes
n
Offset register allows use of a variety of thermal diodes
n
On-board local temperature sensing
n
10 bit plus sign remote diode temperature data format,
0.125 C resolution
n
T_CRIT_A output useful for system shutdown
n
ALERT output supports SMBus 2.0 protocol
n
SMBus 2.0 compatible interface, supports TIMEOUT
n
8-pin MSOP package
Key Specifications
j Supply Voltage
3.0 V to 3.6 V
j Supply Current
0.8 mA (typ)
j Local Temp Accuracy (includes quantization error)
T
A = 25C to 125C
±3.0C (max)
j Remote Diode Temp Accuracy (includes quantization
error)
T
A= 30C to 50C, TD= 120C to 140C
±1.0C (max)
T
A= 0C to 85C, TD= 25C to 140C
±3.0C (max)
Applications
n
Graphics Processor Thermal Management
n
Computer Processor Thermal Management
n
Electronic Test Equipment
n
Office Electronics
Simplified Block Diagram
20053801
NVIDIA is a registered trademark of NVIDIA Corporation.
GeForce is a trademark of NVIDIA Corporation.
Intel and Pentium are registered trademarks of Intel Corporation.
July 2003
LM99
±
1C
Accurate,
High
T
emperature,
Remote
Diode
T
emperature
Sensor
with
T
wo-W
ire
Interface
2003 National Semiconductor Corporation
DS200538
www.national.com
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LM99-1CIMM | 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 |
| LM99-1CIMM/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 |
| LM99-1CIMMX | 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 |
| LM99-1CIMMX/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 |
| LM99-1EVAL | 功能描述:BOARD EVALUATION LM99-1 RoHS:否 类别:编程器，开发系统 >> 评估板 - 传感器 系列:PowerWise® 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:1 系列:- |
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