Thermal sensor keeps
systems cool and quiet
Analog Devices has released its first dBCOOL chip, a complete thermal systems sensor with the ability to monitor and control multiple fans in equipment designed for low noise
Analog Devices has released its first dBCOOL chip, a complete thermal systems sensor with the ability to monitor and control multiple fans in equipment designed for low noise, such as mobile and desktop PCs. The ADM1027 keeps acoustic pollution low, adjusting dynamically to the size of the enclosure in which it is placed and regulating fan usage relative to thermal management needs.
Leveraging an international movement toward a healthier work environment, the ADM1027 is compliant with international standards for environmentally friendly PCs, including Germany's "Blue Angel" ecolabel and Sweden's TCO (the Swedish Confederation of Professional Employees) standard.
The ADM1027 dBCOOL thermal management controller can measure and control the speed of up to four fans - with or without tachometer outputs - allowing them to operate at the lowest possible speed to minimise acoustic noise.
The ADM1027 integrates two remote thermal diode-monitoring channels and one on-chip temperature sensor.
The remote channels can be used to monitor the processor thermal diode or other critical thermal zones, such as the voltage regulation module (VRM), memory or graphics controller zones.
An on-chip ambient temperature sensor monitors up to three thermal zones.
It also offers a temperature offset register to remove offset errors due to remote diode-connected series resistance.
Featuring the industry's only Pentium 4 processor thermal throttling circuit (TCC) monitoring, the ADM1027 also monitors thermal control activity within the CPU itself to ensure no reduction in processor performance.
Through TCC monitoring, it allows automatic system setting of the fan control loop, which compensates for thermal design variability including chassis form factor, fan variation, computer placement, ambient temperature, processor heat sinks and other heat-generating components, such as power supplies, hard-disk drives and video cards.
This provides the quietest operation possible.
It also determines potential overheating due to fan failure, detects the improper mounting of heat sinks, monitors inadequate air flow in the chassis, and alerts the system if there are inadequate heat sinks or too many high-power peripherals or add-in cards.
The ADM1027 can monitor up to five supply voltages.
On-chip scaling resistors reduce external component count and cost and allow direct voltage measurement of +12, +5 and +2.5V CPU supply voltage and its own supply voltage (3.0 to 5.5V).
Used in conjunction with Analog Devices' power management solutions, the ADM1027 can monitor current consumed by the processor via Analog Devices' multiphase synchronous buck regulators such as the ADP3160, ADP3163, ADP3164, and ADP3165, which are used for converting a 5 or 12V main supply into the core supply voltage required by the high-performance Intel processor.
The ADM1027 is sampling now and is priced at $3.75 in 10,000-piece quantities.
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