SMSC EMC2305多转速5风扇PWM控制方案
SMSC 公司的EMC2305是多转速5风扇PWM控制器, SMBus 2.0兼容,每个风扇驱动器由可编程频率的PWM驱动器和风扇速度控制算法来控制,高速PWM频率26kHz,低速PWM频率从9.5Hz到2240Hz,基于RPM的控制算法从500 RPM 到16k RPM(外接晶振)的精度为0.5%,从500 RPM 到16k RPM(内部时钟)的精度为1%,可用于服务器,投映仪,工业和网络设备以及笔记本电脑.本文介绍了EMC2305的主要特性,方框图以及EMC2305参考设计电路图.
EMC2305: Multiple RPM-Based PWM Fan Controller for Five Fans
The EMC2305 is an SMBus compliant fan controller with up to five independently controlled PWM fan drivers. Each fan driver is controlled by a programmable frequency PWM driver and Fan Speed Control algorithm that operates in either a closed loop fashion or as a directly PWM-controlled device.
The closed loop Fan Speed Control algorithm (FSC) has the capability to detect aging fans and alert the system. It will likewise detect and stalled or locked fans and trigger an interrupt.
Additionally, the EMC2305 offers a clock output so that multiple devices may be chained and slaved to the same clock source for optimal performance in large distributed systems.
EMC2305主要特性:
Five Programmable Fan Control circuits (EMC2305)
— 4-wire fan compatible
— High speed PWM (26 kHz)
— Low speed PWM (9.5Hz - 2240 Hz)
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