Thermal Management

Brushless DC Fan Controllers

Fan Controllers


Closed loop fan control includes look-up tables, PID loop control, alert to locked rotors and blocked air path. A majority of the PWM and linear fan controllers feature integrated temperature sensing.
Closed Loop Fan Controllers:


  • Built-in Fan ramp rate and Spin-up Control
  • Integrated temperature measurement
  • Multi-zone Control- up to 4 temps
  • 8 entry lookup tables


Fan Controller and Fault Detectors:


  • Temperature proportional fan speed control
  • FanSense technology protects against fan and system failure and eliminates need for 3-wire fans


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Local Temperature Sensors

Local Temperature Sensors


Microchip offers a complete portfolio of local temperature sensors, including easy to use analog output temperature sensors, a wide variety of serial output temperature sensors as well as temperature switches.


Analog Sensors:


  • Low operating current: 6µA typical
  • 2.5 to 5.5V operating voltage
  • Extended temperature range: – 40ºC to +125ºC
  • Available in 10 mV/ºC and 19.5 mV/ºC linear temperature slopes
  • Small packaging, including 3-pin SOT-23



Serial (Digital) Output Temperature Sensors:


  • ±0.5ºC maximum accuracy
  • 1.7 to 5.5V operating voltage
  • 2-wire SMBus/I2C compatible interface
  • 3 and 4-wire SPI compatible interface
  • One-shot and standby mode for power savings
  • Wide temperature range: -55ºC to +125ºC
  • Small packaging including WLCSP and SOT-23



Temperature Switches:


  • ±0.5ºC typical threshold accuracy
  • Operating current as low as 40 µA
  • Operating supply voltages from 2.7V to 18V
  • Dual trip points on select devices
  • Programmable hysteresis on select devices
  • Small SOT-23, MSOP packages



Analog Sensors
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Serial (Digital) Output Temperature Sensors
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Temperature Switches
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Remote Temperature Sensors

Remote Temperature Sensors IC


Microchips remote temp sensors are digital temp sensors for monitoring multiple heat sources.  The I2C™ / SMBus sensors deliver +/-1 C maximum accuracy performance.  For placement on a large circuit board or off-board with connectors, the remote temperature sensor can reach hundreds of feet.  By utilizing resistance error correction (REC), series resistance effects can be eliminated up to 100 Ω automatically, while maintaining +/-1 C.  For advance processors, the remote temperature sensing can connect to substrate diode pins and use beta compensation to measure temperatures on  CPU, GPU, FPGAs and ASICs.


Digital Temp Sensors


Microchip Technology Inc. offers 2 channels temp sensors, 3 channel temp sensors, 4 channel temp sensors and up to 8 channel temp sensors.Remote temperature sensors are 1C accurate digital temperature sensors. The I2C™ / SMBus sensors include resistance error correction and beta compensation.


Remote Temperature Sensor IC


  • Up to 8 monitoring channels
  • Automatically determines remote diode type settings
  • Resistance error correction to 100Ω
  • Supports BJT/Transistor model for CPU, GPU, FPGA
  • Anti-parallel diode for extra diode support
  • Programmable Ideality Factor
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Sensor Conditioning ICs
Thermal Management Overview

Temperature Sensors


Microchip thermal sensors are tailored to a variety of desired tasks. Analog temperature sensors output voltage and interface well with ADCs. Digital temperature sensors, both local and remote, are I2C or SPI compatible. And Temperature switches result in on/off logic control.


Analog Output:


  • +/- 2oC (max.), 0oC to +70oC
  • Operating current as low as 6uA (typical)
  • Extended Temp Range: -40oC to +125oC
  • 10mV/oC and 19.5mV/oC linear temperature slopes


Digital Temperature Sensors:


  • Local temperature sensors with 0.0625ºC resolution
  • Remote temperature sensors with up to 8 channels
  • I2C, SMBus and SPI thermal sensors
  •  ±0.5°C typical accuracy


Temperature Switch/Thermostat IC:


  • ±0.5°C typical threshold accuracy
  • 2.7V to 18V available supply voltages
  • Dual trip-points for TC620/621/623
  • External temperature sensor for TC621


Thermocouple ICs:



  • Supported Thermocouple Sensor Types:
    K, J, T, N, S, E, B, T, R
  • Integrated error correction
  • Integrated Cold-Junction Compensation
  • Integrated Digital Filtering