National Semiconductor
LM95233/34/35/41

See Associated Figure

QUICK TAKE:
Enlisting patent-pending TruTherm technology, the company's LM952XX family of remotediode temperature sensors promises pinpoint-accurate temperature readings for microprocessors developed on 65-nm and 90-nm processes.
NATIONAL SEMICONDUCTOR CORP., Santa Clara, CA. (800) 272-9959.

More Info:
The 11-bit LM95234 with a 2-wire SMBus interface monitors four remote diodes as well as its own temperature. It supports three critical temperature outputs with individual limits for each channel and masking capability. Two channels have programmable digital filters, while the other two employ a fault queue. Otherwise identical, the LM95233 is a 2-diode version of the LM95234. For dual-diode sensing, the LM95241 with an SMBus 2.0-compatible, 2-wire serial interface senses three temperature zones, two remote diodes, and its own temperature. With digital filtering and an input stage with analog filtering, the device's resolution format is programmable for 11-bits signed or unsigned with the digital filtering disabled. Additionally, readings can resolve temperatures above 127°C. Local temperature readings have a resolution of 9-bits plus sign. The LM95235 is an 11-bit digital temperature sensor with a 2-wire SMBus interface that monitors a single diode and its own temperature. These new sensors are specifically designed for applications such as notebook and desktop computers and servers that are powered by highperformance microprocessors manufactured on 65-nm and 90-nm processes.

WHY IS THIS IMPORTANT?
Thermal management technology such as that found in the LM952XX ICs allows designers to accurately monitor temperature in devices developed on 65-nm and 90-nm processes helping to ensure protection against malfunction or failure due to excessive heat.

MORE ABOUT TRUTHERM TECHNOLOGY
Introduced by the company in the spring of 2005, TruTherm (True Thermal Measurement) transistor-mode beta compensation technology is a method of measuring temperature on integrated circuits designed in deep submicron (< 90 nm) processes. The technique provides highly accurate temperature readings for ICs such as microprocessors, ASICs and FPGAs and greatly reduces the variations in temperature readings. The increased accuracy allows designers to achieve higher performance and efficiency in their applications, while lowering cooling-fan speed, reducing acoustic noise and extending system life.

PRICING AND AVAILABILITY
The LM95235 is available now and the LM95233, LM95234 and LM95241, sampling now, will be available later this year. Prices start at $1.17 each/1,000.

ON THE WEB
Datasheets for the LM95235/34/41 can be found at:
http://cache.national.com/ds/LM/LM95235.pdf
http://cache.national.com/ds/LM/LM95234.pdf
http://cache.national.com/ds/LM/LM95241.pdf