描述

LM94硬件監(jiān)視器具有與SMBus 2.0兼容的雙線數(shù)字接口。 LM94使用ΣΔADC測(cè)量四個(gè)遠(yuǎn)程二極管連接晶體管的溫度，以及自己的芯片和16個(gè)電源電壓。 LM94采用新的TruTherm技術(shù)，支持亞微米工藝處理器的精密熱二極管測(cè)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
• 監(jiān)視16個(gè)電源
• 監(jiān)視4個(gè)遠(yuǎn)程熱敏二極管和2 LM60
• 新的TruTherm技術(shù)支持精密熱二極管測(cè)量
• 內(nèi)部環(huán)境溫度傳感
• 基于溫度讀數(shù)和風(fēng)扇升壓支持的可編程自主風(fēng)扇控制
• 轉(zhuǎn)速計(jì)限制錯(cuò)誤事件上的風(fēng)扇增強(qiáng)支持
• 基于13步查找表或PI控制回路或兩者組合的風(fēng)扇控制
• PI風(fēng)扇控制回路支持Tcontrol
• 溫度讀數(shù)數(shù)字濾波器
• 0.5°C數(shù)字溫度傳感器分辨率
• 0.0625°C風(fēng)扇控制的濾波溫度分辨率
• 2 PWM風(fēng)扇速度控制輸出
• 4風(fēng)扇轉(zhuǎn)速計(jì)輸入
• 雙處理器熱量節(jié)流（ PROCHOT ）監(jiān)控
• 雙動(dòng)態(tài)VID監(jiān)控（6每處理器7個(gè)VID）支持VRD10.2 /11
• 8個(gè)通用I /O：
  • 4可配置為風(fēng)扇轉(zhuǎn)速計(jì)輸入
  • 2可配置為連接到處理器 THERMTRIP
  • 2是可用于監(jiān)控的標(biāo)準(zhǔn)GPIO IERR 信號(hào)
• 2可用于監(jiān)控VRD11的第7個(gè)VID信號(hào)的通用輸入
• 限制寄存器比較所有監(jiān)控值
• 2線串行數(shù)字接口，符合SMBus 2.0
  • 支持字節(jié)/塊讀寫(xiě)
  • 可選從機(jī)地址（三級(jí)引腳選擇1 3可能的地址）
  • ALERT 輸出支持中斷或比較器模式
• 2.5V參考電壓輸出
< li> 56針TSSOP封裝
• XOR-tree測(cè)試模式

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

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參數(shù) 與其它產(chǎn)品相比?數(shù)字溫度傳感器

? 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) ? ?

方框圖

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  LM94 - 功能方框圖

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  LM94 - Typical Application

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  LM94 - Typical Performance

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