The EMC1403 and EMC1404 are high accuracy, low cost, System Management Bus (SMBus) temperature sensors. Advanced features such as Resistance Error Correction (REC), Beta Compensation (to support CPU diodes requiring the BJT/transistor model including 45nm, 65nm and 90nm processors) and automatic diode type detection combine to provide a robust solution for complex environmental monitoring applications.

Each device provides ±1° accuracy for external diode temperatures and ±2°C accuracy for the internal diode temperature. The EMC1403 monitors three temperature channels (two external and one internal). The EMC1404 monitors four temperature channels (three external and one internal).

Resistance Error Correction automatically eliminates the temperature error caused by series resistance allowing greater flexibility in routing thermal diodes. Beta Compensation eliminates temperature errors caused by low, variable beta transistors common in today's fine geometry processors. The automatic beta detection feature monitors each external diode/transistor and determines the optimum sensor settings for accurate temperature measurements regardless of processor technology. This frees the user from providing unique sensor configurations for each temperature monitoring application. These advanced features plus ±1°C measurement accuracy provide a low-cost, highly flexible and accurate solution for critical temperature monitoring applications.

Features

  Support for diodes requiring the BJT/transistor model

  supports 45nm, 65nm, and 90nm CPU thermal diodes.

  Automatically determines external diode type and optimal settings

  Resistance Error Correction

  External Temperature Monitors

  ±1°C Accuracy (60°C < TDIODE < 100°C)

  0.125°C resolution

  Anti-parallel diodes for extra diode support

  Internal Temperature Monitor

  ±2°C accuracy

  3.3V Supply Voltage

  Programmable temperature limits for ALERT# and THERM#

  Available in these RoHS Compliant Packages

  10-pin 3mm x 3mm DFN

  10-pin MSOP

  14-pin SOIC

Applications

  Notebook Computers

  Desktop Computers

  Industrial

  Embedded applications