1 remote and local temp sensor with automatic fan speed control and fault detection


Product details


Local sensor accuracy (Max) (+/- C) 2 Type Fan Controller Operating temperature range (C) -40 to 125 Supply voltage (Min) (V) 2.7 Interface type SMBus Supply voltage (Max) (V) 5.5 Supply current (Max) (uA) 2000 Temp resolution (Max) (bits) 11 Features PWM output, Tachometer Remote channels (#) 1 Addresses 9 Rating Catalog open-in-new Find other Digital temperature sensors

Package | Pins | Size

SSOP (DBQ) 16 29 mm² 4.9 x 6 open-in-new Find other Digital temperature sensors


  • Remote Temperature Sensor:
    ±2°C Accuracy, 0.125°C Resolution
  • Local Temperature Sensor:
    ±2°C Accuracy, 0.125°C Resolution
  • PWM Controller
  • PWM Frequency: 10Hz to 40kHz
    Duty Cycle: 0% to 100%, 8 Bits
  • Automatic Fan Speed Control Loops
  • SMBus Interface
  • Power: 2.7V to 5.5V
  • Package (Green): QSOP-16 (4mm × 5mm)
  • RoHS Compliant
    • Notebook and Desktop PCs
    • Network Servers
    • Telecommunications Equipment
    • PC-Based Equipment
    • DLP and LCD Projectors

DLP is a trademark of Texas Instruments.
Pentium M, Pentium-IV are trademarks of Intel.
JMC is a trademark of JMC Products.
I2C is a trademark of Philips International, Inc.
All other trademarks are the property of their respective owners.

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The AMC6821 is an intelligent temperature monitor and pulse-width modulation (PWM) fan controller. It is designed for noise-sensitive or power-sensitive applications that require active system cooling. Using either a low-frequency or a high-frequency PWM signal, this device can simultaneously drive a fan, monitor remote sensor diode temperatures, and measure and control the fan speed so that it operates with minimal acoustic noise at the lowest possible speed.

The AMC6821 has three fan control modes: Auto Temperature-Fan mode, Software-RPM mode, and Software-DCY mode. Each mode controls the fan speed by changing the duty cycle of a PWM output. Auto Temperature-Fan mode is an intelligent, closed-loop control that optimizes fan speed according to user-defined parameters. This mode allows the AMC6821 to run as a stand-alone device without CPU intervention; the fan can continue to be controlled (based on temperature measurements) even if the CPU or system locks up. Software-RPM mode is a second closed-loop control. In this mode, the AMC6821 adjusts the PWM output to maintain a consistent fan speed at a user-specified target value; that is, the device functions as a fan speed regulator. Software-RPM mode can also be used to allow the AMC6821 to operate as a stand-alone device. The third mode, Software-DCY, is open-loop. In Software-DCY mode, the PWM duty cycle is set directly by the value written to the device.

The AMC6821 has a programmable SMBALERT output to indicate error conditions and a dedicated FAN-FAULT output to indicate fan failure. The THERM pin is a fail-safe output for over-temperature conditions that can be used to throttle a CPU clock. Additionally, the OVR pin indicates the over-temperature limit as well. All of the alarm thresholds are set through the device registers. The AMC6821 is available in a QSOP-16 package.

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Technical documentation

= Top documentation for this product selected by TI
No results found. Please clear your search and try again. View all 6
Type Title Date
* Datasheet Intelligent Temperature Monitor and PWM Fan Controller datasheet (Rev. C) Jul. 26, 2007
Technical articles How to choose the right thermistor for your temperature sensing application Feb. 12, 2020
Technical articles How to enable thermal safety for automotive infotainment and cluster systems Oct. 15, 2019
Technical articles Driving industrial innovation with small-size sensors Sep. 12, 2019
Technical articles How sensor technology is evolving to meet cold chain needs Jun. 18, 2018
User guide AMC6821EVM and AMC6821EVM-PDK (Rev. A) Feb. 23, 2009

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Hardware development


The AMC6821EVM features the AMC6821 Analog Monitoring and Control Circuit device. The AMC6821EVM is a simple evaluation module designed to evaluate the functionality of the this AMC device. The AMC6821 supports the SMBus as its standard serial communication interface data rates of up to 100 kHz (...)

  • J4 on the EVM can be used to access the AMC6821 device through a custom built cable
  • The EVM includes three LED alarm indicators to visually show the user what external temperature conditions exist
  • Power resistor R25 is used to sense external remote temperature and control temperatue using an N-channel (...)

The AMC6821EVM-PDK from TI is a board that uses the USB-MODEVM as the host platform connected to the AMC6821EVM. With this arrangement the EVM-PDK can be used as a complete thermal management kit solution with several fan hardware configurations and temperature sensing options. The cables are (...)

  • Connectors (J2 and P2) provide pass through connection from the PDK to the AMC6821EVM
  • The J1 header is included for easy plug-in of standard connectors that come with a majority of cooling fans
  • The only required power connection for the USB-MODEVM is the USB cable
  • Each power supply has an LED that (...)

Software development

Linux Driver for AMC6821
AMC6821SW-LINUX The Linux driver supports the AMC6821 Temperature Monitoring and Fan Control. The Linux driver supports communication through the I2C bus and interfaces with the Hardware Monitoring sub-system.
Linux Mainline Status

Available in Linux Main line: Yes
Available through N/A

Supported Devices:
  • (...)

Design tools & simulation

SLAC187.ZIP (14 KB) - IBIS Model

CAD/CAE symbols

Package Pins Download
SSOP (DBQ) 16 View options

Ordering & quality

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  • Qualification summary
  • Ongoing reliability monitoring

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