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LM86BIMQX PDF预览

LM86BIMQX

更新时间: 2024-11-06 08:54:23
品牌 Logo 应用领域
美国国家半导体 - NSC 光电二极管
页数 文件大小 规格书
28页 769K
描述
IC SPECIALTY ANALOG CIRCUIT, PDSO24, QSOP-24, Analog IC:Other

LM86BIMQX 数据手册

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OBSOLETE  
October 5, 2011  
LM85  
Hardware Monitor with Integrated Fan Control  
Noise filtering of temperature reading for fan control  
General Description  
1.0°C digital temperature sensor resolution  
The LM85, hardware monitor, has a two wire digital interface  
compatible with SMBus 2.0. Using an 8-bit ΣΔ ADC, the LM85  
measures:  
3 PWM fan speed control outputs  
4 fan tachometer inputs  
Monitors 5 VID control lines  
24-pin QSOP package  
– the temperature of two remote diode connected transis-  
tors as well as its own die  
– the VCCP, 2.5V, 3.3VSBY, 5.0V, and 12V supplies (inter-  
nal scaling resistors).  
XOR-tree test mode  
To set fan speed, the LM85 has three PWM outputs that are  
each controlled by one of three temperature zones. The LM85  
includes a digital filter that can be invoked to smooth temper-  
ature readings for better control of fan speed. The LM85 has  
four tachometer inputs to measure fan speed. Limit and status  
registers for all measured values are included.  
Key Specifications  
Voltage Measument ccuracy  
±2% FS (max)  
8-bits, 1°C  
Resolution  
TemperatuSenscacy  
Tempere Range  
±3°C (max)  
LMOtional  
Remote Teccuracy  
Per Supply Voltage  
wer upply Current  
0°C to +85°C  
0°C to +125°C  
+3.0V to +3.6V  
0.53 mA  
Features  
2-wire, SMBus 2.0 compliant, serial digital interface  
8-bit ΣΔ ADC  
Monitors VCCP, 2.5V, 3.3 VSBY, 5.0V, and 12V  
motherboard/processor supplies  
Applions  
Desktop PC  
Monitors 2 remote thermal diodes  
Microcessor based equipment  
Base-stations, Routers, ATMs, Point of Sales)  
Programmable autonomous fan control based on  
temperature readings  
Block Diagram  
20035301  
© 2011 National Semiconductor Corporation  
200353  
www.national.com  
200353 Version 6 Revision 5 Print Date/Time: 2011/10/05 10:28:21  

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