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ELM331DSB Datasheet(PDF) 1 Page - ELM Electronics |
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ELM331DSB Datasheet(HTML) 1 Page - ELM Electronics |
1 / 4 page ELM331 Elm Electronics – Circuits for the Hobbyist < http://www.elmelectronics.com/ > Connection Diagram PDIP and SOIC (top view) VDD VSS 1 2 3 4 8 7 6 5 Solid State Thermostat 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 10K Ω thermistor). To reduce the possibility of sporadic outputs, a condition must exist for three successive cycles, or 6 seconds, before the output pin can change state. • 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 • Primary thermostat in temperature control systems • Staging control for auxiliary heating or cooling installations • Under or over temperature alarms 2 3 4 6 7 R1 R2 Analog to Digital Converter 5 Control Watchdog Timer Cap MIP Out R1 R2 reset 3 Consecutive Measurements Measurement in Progress (busy) Overrange VDD Out MIP R1 > R2 reset Description Applications Block Diagram 1 of 4 Features ELM331DSB |
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