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Fan Controller and Remote Temperature Sensor with SMBus Serial Interface

Industry First - Temperature Sensor with PWM and Linear Fan Control

Product Details

Key Features

Parametric specs for Fan Controllers
Interface 2-Wire/I2C/SMBus
Sensor Type Remote
Fan Control PWM
Accuracy (±°C) 3
Temp. Thresh. (°C) Programmable
Temp. Resolution (bits) 8
Package/Pins QSOP/16
Budgetary
Price (See Notes)
0
Parametric specs for Fan Controllers
Interface 2-Wire/I2C/SMBus
Sensor Type Remote
Fan Control PWM
Accuracy (±°C) 3
Temp. Thresh. (°C) Programmable
Temp. Resolution (bits) 8
Package/Pins QSOP/16
Budgetary
Price (See Notes)
0
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Simplified Block Diagram

Technical Docs

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Parameters

Parametric specs for Fan Controllers
Interface 2-Wire/I2C/SMBus
Sensor Type Remote
Fan Control PWM
Accuracy (±°C) 3
Temp. Thresh. (°C) Programmable
Temp. Resolution (bits) 8
Package/Pins QSOP/16
Budgetary
Price (See Notes)
0

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

Applications/Uses

  • Computers: Desktop, Workstation, Server
  • Notebook Computers
  • Pentium® CPU Cooling
  • Servers
  • Workstations

Description

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.

Simplified Block Diagram

MAX1669: Typical Operating Circuit MAX1669: Typical Operating Circuit Zoom icon

Technical Docs

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .

Sampling:
Selecting the Sample button above will redirect to the third-party ADI Sample Site. The part selected will carry over to your cart on this site once logged in. Please create a new account there if you have never used the site before. Contact SampleSupport@analog.com with any questions regarding this Sample Site.