LM94 用于服务器管理的硬件监控器，具有 PI 环路风扇控制

描述

LM94硬件监视器具有与SMBus 2.0兼容的双线数字接口。 LM94使用ΣΔADC测量四个远程二极管连接晶体管的温度，以及自己的芯片和16个电源电压。 LM94采用新的TruTherm技术，支持亚微米工艺处理器的精密热二极管测量。

Description (continued)

To set fan speed, the LM94 has two PWM outputs that are each controlled by up to six temperature zones. The fan-control algorithm can be based on a lookup table, PI (proportional/integral) control loop, or a combination of both. The LM94 includes digital filters that can be invoked to smooth temperature readings for better control of fan speed such that acoustical noise is minimized. The LM94 has four tachometer inputs to measure fan speed. Limit and status registers for all measured values are included.

The LM94 builds upon the functionality of previous motherboard server management ASICs, such as the LM93. It also adds measurement and control support for dynamic Vccp monitoring for VRD10/11 and PROCHOT. It is designed to monitor a dual processor Xeon class motherboard with a minimum of external components.

特性

• 8位ΣΔADC
• 监视16个电源
• 监视4个远程热敏二极管和2 LM60
• 新的TruTherm技术支持精密热二极管测量
• 内部环境温度传感
• 基于温度读数和风扇升压支持的可编程自主风扇控制
• 转速计限制错误事件上的风扇增强支持
• 基于13步查找表或PI控制回路或两者组合的风扇控制
• PI风扇控制回路支持Tcontrol
• 温度读数数字滤波器
• 0.5°C数字温度传感器分辨率
• 0.0625°C风扇控制的滤波温度分辨率
• 2 PWM风扇速度控制输出
• 4风扇转速计输入
• 双处理器热量节流（ PROCHOT ）监控
• 双动态VID监控（6每处理器7个VID）支持VRD10.2 /11
• 8个通用I /O：
  • 4可配置为风扇转速计输入
  • 2可配置为连接到处理器 THERMTRIP
  • 2是可用于监控的标准GPIO IERR 信号
• 2可用于监控VRD11的第7个VID信号的通用输入
• 限制寄存器比较所有监控值
• 2线串行数字接口，符合SMBus 2.0
  • 支持字节/块读写
  • 可选从机地址（三级引脚选择1 3可能的地址）
  • ALERT 输出支持中断或比较器模式
• 2.5V参考电压输出
< li> 56针TSSOP封装
• XOR-tree测试模式

Key Specifications

• Voltage Measurement Accuracy ... ±2% FS (max)
• Temperature Resolution ... 9-bits, 0.5°C
• Temperature Sensor Accuracy ... ±2.5 °C (max)
• Temperature Range:
  • LM94 Operational ... 0°C to +85°C
  • Remote Temp Accuracy ... 0°C to +125°C
• Power Supply Voltage ... +3.0V to +3.6V
• Power Supply Current ... 1.6 mA

All trademarks are the property of their respective owners.

参数 与其它产品相比 数字温度传感器

  Device type Interface Local sensor accuracy (Max) (+/- C) Temp Resolution (Max) (bits) Operating temperature range (C) Supply Voltage (Min) (V) Supply Voltage (Max) (V) Supply Current (Max) (uA) Features Remote channels (#) Addresses Rating Package Group Package size: mm2:W x L (PKG)   LM94 Fan Controller     SMBus     3     8     0 to 100     3     3.6     1600     2 PWM outputs with a 13-step lookup table, 4 tachometer and up to 16 supply monitor inputs     4     3     Catalog     TSSOP | 56     56TSSOP: 113 mm2: 8.1 x 14 (TSSOP | 56)    

方框图

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  LM94 - 功能方框图

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  LM94 - Typical Application

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  LM94 - Typical Performance

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