MAX6650, MAX6651 风扇速度控制、监控电路，实

MAX6650, MAX6651 风扇速度控制、监控电路，实现高性能热管理，带有SMBus™/I²C兼容接口

MAX6650, MAX6651 概述

monitor the speed of 5VDC/12VDC brushless fans with built-in tachometers. They automatically force the fan's tachometer frequency (fan speed) to match a preprogrammed value in the Fan-Speed Register by using an external MOSFET or bipolar transistor to linearly regulate the voltage across the fan. The MAX6650 regulates the speed of a single fan by monitoring its tachometer output. The MAX6651 also regulates the speed of a single fan, but it contains additional tachometer inputs to monitor up to four fans and control them as a single unit when they are used in parallel.

The MAX6650/MAX6651 provide general-purpose input/output (GPIO) pins that serve as digital inputs, digital outputs, or various hardware interfaces. Capable of sinking 10mA, these open-drain inputs/outputs can drive an LED. To add additional hardware control, configure GPIO1 to fully turn on the fan in case of software failure. To generate an interrupt when a fault condition is detected, configure GPIO0 to behave as an active-low alert output. Synchronize multiple devices by setting GPIO2 (MAX6651 only) as an internal clock output or an external clock input.

The MAX6650 is available in a space-saving 10-pin µMAX® package, and the MAX6651 is available in a small 16-pin QSOP package.

MAX6650/MAX6651 pdf datasheet

MAX6650, MAX6651 关键特性

Closed/Open-Loop Fan-Speed Control for 5V/12V Fans

2-Wire SMBus/I²C-Compatible Interface

Monitors Tachometer Output

• Single Tachometer (MAX6650)
• Up to Four Tachometers (MAX6651)

Programmable Alert Output

GPIOs

Hardware Full-On Override

Synchronize Multiple Fans

Four Selectable Slave Addresses

3V to 5.5V Supply Voltage

Small Packages

• 10-Pin µMAX (MAX6650)
• 16-Pin QSOP (MAX6651)

应用/使用

 计算机：台式机、工作站、服务器

 网络

 RAID

 服务器

 电信

 工作站

MAX6650/max6651应用电路