ELM331 Overview
The ELM331 is a plete temperature measurement and control system in an 8 pin package. This integrated circuit is designed to pare 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).
ELM331 Key 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
ELM331 Applications
- Primary thermostat in temperature control systems
- Staging control for auxiliary heating or cooling installations