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LM81BIMT-3/NOPB PDF预览

LM81BIMT-3/NOPB

更新时间: 2024-11-24 18:44:11
品牌 Logo 应用领域
美国国家半导体 - NSC 监视器光电二极管
页数 文件大小 规格书
33页 416K
描述
IC SPECIALTY ANALOG CIRCUIT, PDSO24, TSSOP-24, Analog IC:Other

LM81BIMT-3/NOPB 技术参数

是否Rohs认证: 符合生命周期:Transferred
包装说明:TSSOP,Reach Compliance Code:compliant
ECCN代码:EAR99HTS代码:8542.39.00.01
风险等级:5.01其他特性:WATCHDOG COMPARISON OF ALL MONITORED VALUES
模拟集成电路 - 其他类型:ANALOG CIRCUITJESD-30 代码:R-PDSO-G24
JESD-609代码:e3长度:7.8 mm
湿度敏感等级:1功能数量:1
端子数量:24最高工作温度:125 °C
最低工作温度:-40 °C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
认证状态:Not Qualified座面最大高度:1.2 mm
最大供电电压 (Vsup):3.8 V最小供电电压 (Vsup):2.8 V
标称供电电压 (Vsup):3.3 V表面贴装:YES
温度等级:AUTOMOTIVE端子面层:Matte Tin (Sn)
端子形式:GULL WING端子节距:0.65 mm
端子位置:DUAL处于峰值回流温度下的最长时间:40
宽度:4.4 mmBase Number Matches:1

LM81BIMT-3/NOPB 数据手册

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February 2002  
LM81  
Serial Interface ACPI-Compatible Microprocessor System  
Hardware Monitor  
n Chassis Intrusion detector input  
General Description  
n WATCHDOG comparison of all monitored values  
The LM81 is a highly integrated data acquisition system for  
n SMBus 1.0 (LM81C) and 1.1 (LM81B) Serial Bus  
hardware monitoring of servers, Personal Computers, or  
interface compatibility  
virtually any microprocessor-based system. In a PC, the  
LM81 can be used to monitor power supply voltages, tem-  
peratures, and fan speeds. Actual values for these inputs  
n LM81B has improved voltage monitoring accuracy  
n VID0-VID4 monitoring inputs  
can be read at any time. Programmable WATCHDOG limits  
in the LM81 activate a fully programmable and maskable  
interrupt system with two outputs (INT and T_CRIT_).  
Key Specifications  
j
±
+2% or 1.2% (max)  
Voltage Monitoring Error  
The LM81 has an on-chip digital output temperature sensor  
with 9-bit or 12-bit resolution, a 6 analog input ADC with 8-bit  
resolution and an 8-bit DAC. Two fan tachometer outputs  
can be measured with the LM81’s FAN1 and FAN2 inputs.  
The DAC, with a 0 to 1.25V output voltage range, can be  
used for fan speed control. Additional inputs are provided for  
Chassis Intrusion detection circuits, and VID monitor inputs.  
The LM81 has a Serial Bus interface that is compatible with  
j
Temperature Error  
−40˚C to +125˚C  
±
3˚C (max)  
j
j
j
j
Supply Voltage Range  
Supply Current  
2.8V to 3.8V  
0.4 mA (typ)  
8 Bits  
ADC and DAC Resolution  
Temperature Resolution  
0.5˚C  
SMBus  
.
Applications  
n System Thermal and Hardware Monitoring for Servers  
and PCs  
Features  
n Temperature sensing  
n 6 positive voltage inputs with scaling resistors to monitor  
+5V, +12V, +3.3V, +2.5V, Vccp power supplies directly  
n 8-bit DAC output for controlling fan speed  
n 2 fan speed monitoring inputs  
n Office Electronics  
n Electronic Test Equipment and Instrumentation  
Typical Application  
DS100072-1  
# Indicates Active Low (“Not”)  
© 2002 National Semiconductor Corporation  
DS100072  
www.national.com  

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