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 16°C and operates on that shifted temperature:

  T_{ACTUAL DIODE JUNCTION} = T_LM99 + 16°C

The local temperature reading requires no offset.

The LM99 has an Offset Register which provides a means for precise matching to various thermal diodes.

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 temperature 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.

• Accurately Senses the Temperature of Remote Diodes
• Offset Register Allows Use of a Variety of Thermal Diodes
• On-board Local Temperature Sensing
• 10 Bit Plus Sign Remote Diode Temperature Data Format, 0.125 °C Resolution
• T_CRIT_A Output Useful for System Shutdown
• ALERT Output Supports SMBus 2.0 Protocol
• SMBus 2.0 Compatible Interface, Supports TIMEOUT
• 8-Pin VSSOP Package

Key Specifications

• Supply Voltage 3.0 V to 3.6 V
• Supply Current 0.8 mA (typ)
• Local Temp Accuracy (Includes Quantization error)
  • TA = 25°C to 125°C ±3.0°C (Max)
• Remote Diode Temp Accuracy (Includes Quantization Error)
  • TA = 30°C to 50°C, TD = 120°C to 140°C ±1.0°C (Max)
  • TA = 0°C to 85°C, TD = 25°C to 140°C ±3.0°C (Max)

All trademarks are the property of their respective owners.

• Local sensor accuracy (Max) (+/- C)
• 3
• Type
• Remote
• Operating temperature range (C)
• 0 to 85
• Supply voltage (Min) (V)
• 2.7
• Interface type
• I2C, SMBus
• Supply voltage (Max) (V)
• 5.5
• Supply current (Max) (uA)
• 1700
• Temp resolution (Max) (bits)
• 8
• Features
• One-shot conversion, ALERT
• Remote channels (#)
• 1
• Addresses
• 2
• Rating
• Catalog

LM99的完整型号有：LM99-1CIMM/NOPB、LM99CIMM/NOPB、LM99CIMMX/NOPB，以下是这些产品的关键参数及官网采购报价：

LM99-1CIMM/NOPB，工作温度：0 to 85，封装：VSSOP (DGK)-8，包装数量MPQ：1000个，MSL 等级/回流焊峰值温度：Level-1-260C-UNLIM，引脚镀层/焊球材料：SN，TI官网LM99-1CIMM/NOPB的批量USD价格：1.265（1000+）

LM99CIMM/NOPB，工作温度：0 to 85，封装：VSSOP (DGK)-8，包装数量MPQ：1000个，MSL 等级/回流焊峰值温度：Level-1-260C-UNLIM，引脚镀层/焊球材料：SN，TI官网LM99CIMM/NOPB的批量USD价格：1.518（1000+）

LM99CIMMX/NOPB，工作温度：0 to 85，封装：VSSOP (DGK)-8，包装数量MPQ：3500个，MSL 等级/回流焊峰值温度：Level-1-260C-UNLIM，引脚镀层/焊球材料：SN，TI官网LM99CIMMX/NOPB的批量USD价格：1.265（1000+）

DIGITALTEMPSENSORSEVM-SW — 用于硬件监控器和数字温度传感器的评估板软件

Evaluation Board Software for Hardware Monitors and Digital Temperature Sensors

LM90SW-LINUX — 用于 LM90 的 Linux 驱动程序

The Linux driver supports the LM90 series of Remote and Local Temp Sensors. The Linux driver supports communication through the I2C bus and interfaces with the Hardware Monitoring sub-system.

Linux Mainline Status

Available in Linux Main line: Yes
Available through git.ti.com: N/A

Supported Devices:

• (...)

SENSOREVAL — 用于硬件监控器和数字温度传感器的评估板软件

SensorEval
SensorEval 软件支持通过 USB 接口连接的 TI 最新温度传感器和硬件监控器评估板。此外，该软件还允许访问直接安装在支持 Intel 芯片组的主板上的传感器。

• 下载 SensorEval 软件和手册
• 为以下各项提供 Windows XP 支持：
  • USB 评估板（LM93 除外）
  • Intel ICHx 接口（ADCS9888、LM32、LM40、LM41、LM71、LM95010 和 LM95071 除外）
  • “无硬件”模式支持在没有任何硬件的情况下运行软件