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ELM331 - Solid State Thermostat

Description

The ELM331 is a complete temperature measurement and control system in an 8 pin package.

This integrated circuit is designed to compare two resistances and drive an output pin depending on the relative value of each.

Features

  • Low power CMOS design - typically 1mA at 5V.
  • Wide supply range - 3.0 to 5.5 volt operation.
  • Built-in proportional hysteresis.
  • Measurement in progress output.
  • Time delay on operate improves noise immunity.
  • Internal pullup resistor on the reset input.
  • High current drive outputs - up to 25 mA Connection Diagram PDIP and SOIC (top view) VDD 1 R1 2 R2 3 reset 4 8 VSS 7 Out 6 MIP 5 Cap Block Diagram reset 4 2 R1 3 R2 5 VDD Contr.

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Datasheet preview – ELM331

Datasheet Details

Part number ELM331
Manufacturer ELM Electronics
File Size 20.75 KB
Description Solid State Thermostat
Datasheet download datasheet ELM331 Datasheet
Additional preview pages of the ELM331 datasheet.

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Full PDF Text Transcription

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ELM331 Solid State Thermostat Description The ELM331 is a complete temperature measurement and control system in an 8 pin package. This integrated circuit is designed to compare two resistances and drive an output pin depending on the relative value of each. Typically, one of the resistors will be an NTC thermistor, and the other one will be a temperature independent resistor (whether fixed or variable). When the magnitude of the resistance connected to pin 2 exceeds the value of the resistance connected to pin 3, the output pin will be driven to a high state. Hysteresis maintains the output in that state until the relative values differ by approximately 8% (or typically 2°C for a 10KΩ thermistor).
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