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MAX1669：风扇控制器及远端温度传感器，带有SMBus串行接口

业内首款可提供PWM、线性风扇控制的温度传感器

The MAX1669 fan controller includes a precise digital thermometer that reports the temperature of a remote sensor. The remote sensor is a diode-connected transistor-typically a low-cost, easily mounted 2N3906 PNP type-replacing conventional thermistors or thermocouples. Remote accuracy is ±3°C for transistors from multiple manufacturers, with no calibration needed. The MAX1669 has an independent fan controller with a low-current logic output requiring external power components to interface to a DC brushless fan. The fan controller has two modes of operation: a low-frequency (20Hz to 160Hz) PWM mode intended for driving the fan motor, or a high-impedance DAC output that generates a variable DC control voltage. In PWM mode, the FAN frequency can be synchronized to an external clock. Other key features include general-purpose inputs/outputs (GPIOs) for fan presence detection and a thermostat output intended as a fan override signal in case the host system loses the ability to communicate. The internal ADC has a wide input voltage range and gives overrange readings when too large an input voltage is applied. Other error-checking includes temperature out-of-range indication and diode open/short faults. The MAX1669 is available in a space-saving 16-pin QSOP package that allows it to fit adjacent to the SLOT1 connector.

关键特性 Measures Remote CPU Temperature No Calibration Required 20Hz to 160Hz PWM Output for Fan PWM Frequency Sync Input (260kHz) Flexible Fan Interface: Linear or PWM SMBus 2-Wire Serial Interface Programmable Under/Overtemperature Alarms ALERT-bar Latched Interrupt Output OVERT-bar Thermostat Output Two GPIO Pins Write-Once Configuration Protection Supports SMBus Alert Response ±3°C Temperature Accuracy (-40°C to +125°C, remote) 3µA Standby Supply Current +3V to +5.5V Supply Range Small 16-Pin QSOP Package Remote diode sensor, PWM and linear fan control, dual alarms

功能框图 产品应用 计算机：台式机、工作站和服务器 笔记本电脑 Pentium® CPU冷却装置 服务器 工作站

关键参数

数据手册DataSheet

开发工具

• MAX1669EVSYS

技术资料

• Fan Speed Control Is Cool!
• Rev Up Your Fan-Speed Control Designs
• Temperature Sensor ICs Simplify Designs

质量和环境数据

• MAX1669.pdf

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