EE Product News

SMSC EMC140x and EMC142x Temperature Sensors

Groomed for 90-nm designs and below, in particular the current wave of mobile processors, the EMC 140x and EMC 142x series temperature sensors monitor the primary CPU and provide up to three remote temperature measurements that may include graphic processors, DIMMs, and wireless cards. SMSC, Hauppauge, NY. (631) 435-6000.

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Both series exploit the company's established thermal technologies: auto beta compensation, resistance-error correction, and anti-parallel diodes. The EMC1402, 1403, and 1404 sensors provide interrupt capability and the EMC1422, 1423, and 1424 add a system-shutdown function, which ensures proper shutdown temperature at start-up, a point between 77°C and 112°C that is adjustable without software. Other shared features of both series include a remote temperature accuracy of ±1°C, an internal ambient temperature sensory accuracy of ±2°C, critical shutdown, and over-/under-temperature alerts.

Key Features of the EMC1400 Family:

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


  • Auto Beta Compensation
    This technology compensates for temperature measurement error commonly found in processors at 65 nm and below. It dispenses with the common software configuration for different remote diodes and enables design flexibility.
  • 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, which is unacceptable in today's design environments. With resistance error correction technology, this error is avoided, eliminating time-consuming system characterization.
  • Anti-parallel Diodes
    Using this SMSC proprietary technology, 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.

Temperature Sensor Trends
As advanced mobile electronics, PC and embedded applications continue to move up the curve of higher processing performance, the need exists to control the heat generated by these processors. The research firm DataBeans estimates the current market for temperature sensor ICs at $783 million. Growing at an aggressive average annual growth rate of 20 percent each year, this market may reach nearly $2 billion in the next five years.

Price and Availability
Samples of the EMC1400 devices are available now with production quantities slated for the first quarter of 2007. Prices will range from $0.60 to $1 each in OEM quantities.

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Company: SMSC

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