GENERAL DESCRIPTION
The ADT14 is a temperature sensor and controller that generates an output voltage proportional to temperature and provides four temperature trip points. The four trip points, or temperature setpoints, and their hysteresis are determined by voltage levels set by the user. An on-chip voltage reference provides an easy method for setting the temperature trip points.
The ADT14 consists of a bandgap voltage reference combined with four matched comparators. The reference provides both a temperature-stable 2.5 V output, and a voltage proportional to absolute temperature (VPTAT) which has a precise temperature coefficient of 5 mV/K = 5 mV/(°C +273.15). The VPTAT output is nominally 1.49 V at +25°C. The comparators determine whether the VPTAT output is above the voltages set up by external resistive dividers (temperature trip points) and generate an open-collector output signal when one of their respective thresholds has been exceeded.

FEATURES
  Four Programmable Temperature Setpoints
  Programmable Thermal Hysteresis
  Accuracy 638C Typ from –408C to +1258C
  Temperature Output Scale Factor = 5 mV/K
  Resistor Programmable Temperature Setpoints
  5 mA Open-Collector Setpoint Outputs
  Internal 2.5 V Reference
  600 mA Max Quiescent Current at +5 V

APPLICATIONS
  Power Supply Monitor and Control System
  Multiple Fan Controller System
  Workstation Thermal Management System