SMSC Advanced Temperature Sensors

SMSC offers two new distinct families of temperature sensors: the EMC1402, 1403 and 1404 series and the EMC1422, 1423 and 1424 series that address the CPU and up to three remote temperature measurements, including graphic processors, DIMM and wireless cards.

While the EMC1402, 1403, and 1404 devices are temperature sensors with interrupt capability, the EMC1422, 1423 and 1424 offer the added benefit of system shutdown. This gives designers the ability to ensure proper shutdown temperature at start-up, at a point between 77° C and 112° C, which is adjustable without software. This shutdown integrates the value of temperature switches often used to respond to critical thermal events. By using the technology of Resistance Error Correction and Auto Beta Compensation, all of these devices reduce the need for a temperature offset register to fine tune measurement accuracy. This saves days of engineering time normally spent characterizing a system.

SMSC brings to market three key technologies — Auto Beta Compensation, Resistance Error Correction and Anti-parallel Diodes — all of which save system characterization and engineering time, speeding product time-to-market.

Auto Beta Compensation
Providing designers with the benefits of SMSC’s thermal management technology, Auto Beta Compensation dispenses with the common software configuration for different remote diodes. This technology enables design flexibility and eliminates configuration for many processor types.

Resistance Error Correction
A common source of temperature measurement errors is the series resistance in processor diodes and board traces. This resistance can cause errors of up to 4° C — unacceptable in today’s design environments. Leveraging SMSC’s Resistance Error Correction technology, this error is avoided, eliminating time-consuming system characterization.

Anti-parallel Diodes
Using SMSC’s Anti-parallel Diodes, designers can minimize the board traces required to connect remote diode transistors for temperature measurement. This eases the task of routing in compact designs such as laptop computers. The Anti-parallel Diodes also allow for a population of one or two remote diodes for variations in design on the same board.

Key Features of SMSC’s EMC1400:

  • Auto Beta Compensation
  • Resistance Error Correction — automatic up to 100O
  • Anti-parallel Diodes
  • Remote temperature accuracy of +/-1° C
  • Internal ambient temperature sensory accuracy of +/-2° C
  • Critical shutdown and over/under temperature alerts

Samples of the EMC1400 family of temperature sensor devices are available now with production quantities available in the first quarter of 2007. The price range will be $0.60 – $1.00 per unit (U.S. list price) in OEM quantities.

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