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数字温度传感器

LM87

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具有 2 条远程和 1 条本地通道的温度传感器、风扇控制、硬件和 8 个电源电压监控器

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LM87

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产品详情

Local sensor accuracy (max) 1 Type Fan Controller Operating temperature range (°C) -40 to 125 Supply voltage (min) (V) 2.8 Interface type I2C, SMBus Supply voltage (max) (V) 3.8 Features ALERT, Tachometer Supply current (max) (µA) 1200 Temp resolution (max) (Bits) 8 Remote channels (#) 2 Addresses 1 Rating Catalog
Local sensor accuracy (max) 1 Type Fan Controller Operating temperature range (°C) -40 to 125 Supply voltage (min) (V) 2.8 Interface type I2C, SMBus Supply voltage (max) (V) 3.8 Features ALERT, Tachometer Supply current (max) (µA) 1200 Temp resolution (max) (Bits) 8 Remote channels (#) 2 Addresses 1 Rating Catalog
TSSOP (PW) 24 49.92 mm² 7.8 x 6.4
  • Remote diode temperature sensing (2 channels)
  • 8 positive voltage inputs with scaling resistors for monitoring +5 V, +12 V, +3.3 V, +2.5 V, Vccp power supplies directly
  • 2 inputs selectable for fan speed or voltage monitoring
  • 8-bit DAC output for controlling fan speed
  • Chassis Intrusion Detector input
  • WATCHDOG comparison of all monitored values
  • SMBus or I2C Serial Bus interface compatibility
  • VID0-VID4 or IRQ0-IRQ4 monitoring inputs
  • On chip temperature sensor

Key Specifications

  • Voltage Monitoring Error ±2 % (max)
  • External Temperature Error ±4 °C (max)
  • Internal Temperature Error
    • −40 °C to +125 °C ± 3 °C (typ)
  • Supply Voltage Range 2.8 to 3.8 V
  • Supply Current 0.7 mA (typ)
  • ADC and DAC Resolution 8 Bits
  • Temperature Resolution 1.0 °C

All trademarks are the property of their respective owners.

  • Remote diode temperature sensing (2 channels)
  • 8 positive voltage inputs with scaling resistors for monitoring +5 V, +12 V, +3.3 V, +2.5 V, Vccp power supplies directly
  • 2 inputs selectable for fan speed or voltage monitoring
  • 8-bit DAC output for controlling fan speed
  • Chassis Intrusion Detector input
  • WATCHDOG comparison of all monitored values
  • SMBus or I2C Serial Bus interface compatibility
  • VID0-VID4 or IRQ0-IRQ4 monitoring inputs
  • On chip temperature sensor

Key Specifications

  • Voltage Monitoring Error ±2 % (max)
  • External Temperature Error ±4 °C (max)
  • Internal Temperature Error
    • −40 °C to +125 °C ± 3 °C (typ)
  • Supply Voltage Range 2.8 to 3.8 V
  • Supply Current 0.7 mA (typ)
  • ADC and DAC Resolution 8 Bits
  • Temperature Resolution 1.0 °C

All trademarks are the property of their respective owners.

The LM87 is a highly integrated data acquisition system for hardware monitoring of servers, Personal Computers, or virtually any microprocessor-based system. In a PC, the LM87 can be used to monitor power supply voltages, motherboard and processor temperatures, and fan speeds. Actual values for these inputs can be read at any time. Programmable WATCHDOG limits in the LM87 activate a fully programmable and maskable interrupt system with two outputs (INT# and THERM#).

The LM87 has an on-chip digital output temperature sensor with 8-bit resolution as well as the capability of monitoring 2 external diode temperatures to 8-bit resolution, an 8 channel analog input ADC with 8-bit resolution and an 8-bit DAC. A channel on the ADC measures the supply voltage applied to the LM87, nominally 3.3 V. Two of the ADC inputs can be redirected to a counter that can measure the speed of up to 2 fans. A slow speed ΣΔ ADC architecture allows stable measurement of signals in an extremely noisy environment. The DAC, with a 0 to 2.5 V output voltage range, can be used for fan speed control. Additional inputs are provided for Chassis Intrusion detection circuits, and VID monitor inputs. The VID monitor inputs can also be used as IRQ inputs if VID monitoring is not required. The LM87 has a Serial Bus interface that is compatible with SMBus and I2C.

The LM87 is a highly integrated data acquisition system for hardware monitoring of servers, Personal Computers, or virtually any microprocessor-based system. In a PC, the LM87 can be used to monitor power supply voltages, motherboard and processor temperatures, and fan speeds. Actual values for these inputs can be read at any time. Programmable WATCHDOG limits in the LM87 activate a fully programmable and maskable interrupt system with two outputs (INT# and THERM#).

The LM87 has an on-chip digital output temperature sensor with 8-bit resolution as well as the capability of monitoring 2 external diode temperatures to 8-bit resolution, an 8 channel analog input ADC with 8-bit resolution and an 8-bit DAC. A channel on the ADC measures the supply voltage applied to the LM87, nominally 3.3 V. Two of the ADC inputs can be redirected to a counter that can measure the speed of up to 2 fans. A slow speed ΣΔ ADC architecture allows stable measurement of signals in an extremely noisy environment. The DAC, with a 0 to 2.5 V output voltage range, can be used for fan speed control. Additional inputs are provided for Chassis Intrusion detection circuits, and VID monitor inputs. The VID monitor inputs can also be used as IRQ inputs if VID monitoring is not required. The LM87 has a Serial Bus interface that is compatible with SMBus and I2C.

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技术文档

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类型 标题 下载最新的英语版本 日期
* 数据表 LM87 Serial Interface Sys Hardware Monitor w/Remote Diode Temp Sensing 数据表 (Rev. J) 2013年 3月 22日
应用手册 Applying I2C-Compatible Temperature Sensors in Systems With Slow Clock Edges (Rev. A) 2013年 5月 6日
白皮书 Cost Effective Partitioning of IO & Mgm Func in PCs - Intro of SensorPath Tech 2004年 1月 1日

设计和开发

如需其他信息或资源，请点击以下任一标题进入详情页面查看（如有）。

驱动程序或库

LM87SW-LINUX — 用于 LM87 的 Linux 驱动程序

Linux 驱动程序支持 LM87 系统硬件监测计。Linux 驱动程序支持通过 I2C 总线和接口与硬件监测子系统进行通信。
Linux 主线状态

在 Linux 主线中提供：是
可通过 git.ti.com 获取：不适用

支持的器件：
  • lm87
Linux 源文件

与该器件关联的文件为：

  1. drivers/hwmon/lm87.c
  2. Documentation/hwmon/lm87
源文件

drivers/hwmon/lm87.c

其他文件

Documentation/hwmon/lm87

 

启用驱动程序支持

使用“make menuconfig”（也可以使用“make (...)
查看选项
封装 引脚 下载
TSSOP (PW) 24 查看选项
应遵守 TI 评估类商品的标准条款与条件。

订购和质量

包含信息：
  • RoHS
  • REACH
  • 器件标识
  • 引脚镀层/焊球材料
  • MSL 等级/回流焊峰值温度
  • MTBF/时基故障估算
  • 材料成分
  • 鉴定摘要
  • 持续可靠性监测
包含信息：
  • 制造厂地点
  • 封装厂地点

支持和培训

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