Ultra high accuracy digital temperature sensor and thermal watchdog

Providing an overtemperature detection output, the SE95 is a temperature-to-digital converter using an on-chip band gap temperature sensor and Sigma Delta analog-to-digital conversion technique. Aside from being a converter, SE95 also functions as a thermal detector. It contains a number of data registers accessed by a controller via the 2-wire serial I²C-bus interface.

The device includes an open-drain output (pin OS) which becomes active when the temperature exceeds the programmed limits. There are three selectable logic address pins (pins A2 to A0) so that eight devices can be connected on the same bus without address conflict. The device is powered-up in normal operation mode with the OS in comparator mode, temperature threshold of 80 Cel and hysteresis of 75 Cel, so that it can be used as a stand-alone thermostat with those pre-defined temperature set points.

BLOCK DIAGRAM: SE95D, SE95DP, SE95U

BLOCK DIAGRAM: SE95D, SE95DP, SE95U

Why Used

  • Pin-for-pin replacement for industry standard LM75/LM75A
  • 13-bit ADC that offers a temperature resolution of 0.03125 Cel
  • Programmable temperature threshold and hysteresis set points
  • Stand-alone operation as thermostat at power-up
  • Latch-up testing is done to JEDEC Standard JESD78 which exceeds 100 mA

Where Used

  • System thermal management
  • Personal computers
  • Electronics equipment
  • Industrial controllers

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