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LM94

更新时间： 2024-02-17 11:46:11
品牌 Logo 应用领域
美国国家半导体 - NSC 风扇监控服务器
页数 文件大小 规格书
24页 697K
描述
TruTherTM Hardware Monitor with PI Loop Fan Control for Server Management

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LM94 技术参数

是否无铅： 不含铅是否Rohs认证： 符合
生命周期：Active零件包装代码：TSSOP
包装说明：TSSOP,针数：56
Reach Compliance Code：compliantECCN代码：EAR99
HTS代码：8542.39.00.01风险等级：5.06
模拟集成电路 - 其他类型：ANALOG CIRCUITJESD-30 代码：R-PDSO-G56
JESD-609代码：e3长度：14 mm
湿度敏感等级：2信道数量：16
功能数量：1端子数量：56
最高工作温度：100 °C最低工作温度：
封装主体材料：PLASTIC/EPOXY封装代码：TSSOP
封装形状：RECTANGULAR封装形式：SMALL OUTLINE, THIN PROFILE, SHRINK PITCH
峰值回流温度（摄氏度）：260座面最大高度：1.15 mm
最大供电电压 (Vsup)：3.6 V最小供电电压 (Vsup)：3 V
标称供电电压 (Vsup)：3.3 V表面贴装：YES
温度等级：OTHER端子面层：Matte Tin (Sn)
端子形式：GULL WING端子节距：0.5 mm
端子位置：DUAL处于峰值回流温度下的最长时间：NOT SPECIFIED
宽度：6.1 mmBase Number Matches：1

LM94 数据手册

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April 2006  
LM94  
™
TruTherm Hardware Monitor with PI Loop Fan Control  
for Server Management  
n 2 PWM fan speed control outputs  
1.0 General Description  
n 4 fan tachometer inputs  
The LM94 hardware monitor has a two wire digital interface  
n Dual processor thermal throttling (PROCHOT)  
compatible with SMBus 2.0. Using a Σ∆ ADC, the LM94  
monitoring  
measures the temperature of four remote diode connected  
n Dual dynamic VID monitoring (6/7 VIDs per processor)  
supports VRD10.2/11  
n 8 general purpose I/Os:  
— 4 can be configured as fan tachometer inputs  
— 2 can be configured to connect to processor  
THERMTRIP  
— 2 are standard GPIOs that could be used to monitor  
IERR signal  
transistors as well as its own die and 16 power supply  
voltages. The LM94 has new TruTherm technology that sup-  
ports precision thermal diode measurements of processors  
on sub-micron processes.  
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.  
n 2 general purpose inputs that can be used to monitor  
the 7th VID signal for VRD11  
n Limit register comparisons of all monitored values  
n 2-wire serial digital interface, SMBus 2.0 compliant  
— Supports byte/block read and write  
— Selectable slave address (tri-level pin selects 1 of 3  
possible addresses)  
— ALERT output supports interrupt or comparator  
modes  
n 2.5V reference voltage output  
The LM94 builds upon the functionality of previous mother-  
board 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.  
n 56-pin TSSOP package  
n XOR-tree test mode  
2.0 Features  
3.0 Key Specifications  
n 8-bit Σ∆ ADC  
n Voltage Measurement Accuracy  
n Temperature Resolution  
n Temperature Sensor Accuracy  
n Temperature Range:  
2% FS (max)  
9-bits, 0.5˚C  
2.5 ˚C (max)  
n Monitors 16 power supplies  
n Monitors 4 remote thermal diodes and 2 LM60  
n New TruTherm technology support for precision thermal  
diode measurements  
— LM94 Operational  
0˚C to +85˚C  
0˚C to +125˚C  
+3.0V to +3.6V  
1.6 mA  
n Internal ambient temperature sensing  
n Programmable autonomous fan control based on  
temperature readings with fan boost support  
n Fan boost support on tachometer limit error event  
n Fan control based on 13-step lookup table or PI Control  
Loop or combination of both  
— Remote Temp Accuracy  
n Power Supply Voltage  
n Power Supply Current  
4.0 Applications  
n Servers  
n Workstations  
n PI fan control loop supports Tcontrol  
n Temperature reading digital filters  
n 0.5˚C digital temperature sensor resolution  
n 0.0625˚C filtered temperature resolution for fan control  
n Multi-processor based equipment  
5.0 Ordering Information  
Order Number NS Package Number Transport media  
LM94CIMT  
MTD56  
MTD56  
34 units in rail  
1000 units in tape-and-reel  
LM94CIMTX  
2
I
C is a registered trademark of the Philips Corporation.  
© 2006 National Semiconductor Corporation  
DS201124  
www.national.com  
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