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MAX1669：Fan Controller and Remote Temperature Sensor with SMBus Serial Interface

Industry First - Temperature Sensor with PWM and Linear Fan Control

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.

Key Features 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

MAX1669: Typical Operating Circuit Applications/Uses Computers: Desktop, Workstation, Server Notebook Computers Pentium® CPU Cooling Servers Workstations

DataSheet

Parametrics

Design kits & evaluation modules

• MAX1669EVSYS

Quality and Environmental Data

• MAX1669.pdf

Related Products

• MAX1619：Remote/Local Temperature Sensor with Dual Alarm Outputs and SMBus Serial Interface
• MAX1617A：Remote/Local Temperature Sensor with SMBus Serial Interface

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