Thermal management solutions include support for Intel platform environmental control interface

Andigilog, the fabless semiconductor company providing intelligent thermal management solutions, today announced the aSC7621 and the aSC7611 thermal management system controllers with integrated fan control.

Both devices are based on the Andigilog ThermalEdge technology, which enables accurate temperature sensing, precision system control and acoustic and cooling management for computer subsystems. Andigilog's highly accurate sensing allows both devices to enable much quieter systems, optimize systems performance and improve reliability.

“Thermal management in desktops and servers continues to be a critical issue for manufacturers, IT administrators and users,” noted Bill Sheppard, president and chief executive officer of Andigilog. “Andigilog's unique, highly accurate temperature sensing approach, integrated with intelligent control of thermal management subsystems, gives manufacturers an efficient and cost-effective way to reduce heat and increase system performance.”

Andigilog's introduction of the aSC7611 and aSC7621 allows customers to choose a variety of solutions for thermal sensing and fan management. At the heart of the new thermal management system controllers is Andigilog's unique sensing technology that enables accurate temperature measurements. With resolution of 1/4 of a degree of temperature, Andigilog products have the ability to output smaller pulse-width modulation increments, which means the changes in fan speed are no longer limited to coarse steps.

aSC7611 Block Diagram
aSC7611 hardware monitor with fan control

aSC7621 Block Diagram
aSC7621 hardware monitor with fan control and PECI

In addition, Andigilog has created support for the emerging Platform Environmental Control Interface, or PECI, created by Intel and expected to be implemented in future desktop PCs and servers. PECI is a new digital interface that enables communication of the temperature reading of a systems' host processor, enabling efficient platform thermal control. This digital thermometer capability of PECI will co-exist with remote diode interfaces now used in most systems.

“Like Simple Serial Transport (SST), PECI contributes significantly to managing thermal issues more efficiently. Devices to support PECI will enable manufacturers to offer systems that operate at optimum performance more quietly, while consuming less power,” said Damon Oresky, chipset product marketing manager for Intel Corporation.

Andigilog aSC7611 and aSC7621 Features
Both the aSC7621 and the aSC7611 are compliant with SMBus 2.0 and include support for three fans, four fan tachometer inputs, voltage monitoring, high- and low-speed PWM (pulse width modulation) and assignment of temperature zones. They both support system management features including shutdown mode to reduce power consumption, the ability to lock critical controls after initialization, and 3.3 volt operation with 5 or 12 volt fans.

Both devices also support Intel's automatic fan speed control algorithm that enables independent fan control apart from the system BIOS. The aSC7611 supports automatic fan speed control for 3 temperature zones: one internal and two remote diode temperature readings. The aSC7621 supports four thermal management zones: one internal and two remote diode readings along with the CPU through PECI. In addition, the aSC7621 can map any temperature to any zone enabling system designers to have greater amount of flexibility for thermal management configuration.

Other features common to both parts include:

  • Operating voltage of 3.3 volts
  • 10-bit analog-to-digital converter
  • Two-wire digital interface compatible with SMBus 2.0,
  • Monitors VCCP, 2.5, 3.3, 5 and 12-volt motherboard and processor supplies
  • Noise filtering of temperature readings
  • 0.25 degrees Celsius digital temperature sensor resolution
  • Three PWM fan speed-control outputs for fans with two, three or four wires
  • Low and high PWM frequency ranges
  • Four fan tachometer inputs
  • 24-pin QSOP package

General samples and an evaluation kit are available now with production planned for the end of the year. The aSC7621 is priced at $1.45 per unit U.S. in 1K unit quantities. The aSC7611is priced at $1.25 per unit U.S. in 1K unit quantities. For more details, please go to .

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