The DS18S20-PAR digital thermometer provides 9â€“bit centigrade temperature measurements and has an alarm function with nonvolatile user-programmable upper and lower trigger points. The DS18S20-PAR does not need an external power supply because it derives power directly from the data line (â€śparasite powerâ€ť). The DS18S20-PAR communicates over a 1-wire bus, which by definition requires only one data line (and ground) for communication with a central microprocessor. It has an operating temperature range of â€“55Â°C to +100Â°C and is accurate to Â±0.5Â°C over a range of â€“10Â°C to +85Â°C.
Each DS18S20-PAR has a unique 64-bit identification code, which allows multiple DS18S20-PARs to function on the same 1â€“wire bus; thus, it is simple to use one microprocessor to control many DS18S20-PARs distributed over a large area. Applications that can benefit from this feature include HVAC environmental controls, temperature monitoring systems inside buildings, equipment or machinery, and process monitoring and control systems.
â€˘ Unique 1-wire interface requires only one port pin for communication
â€˘ Derives power from data line (â€śparasite powerâ€ť)â€”does not need a local power supply
â€˘ Multi-drop capability simplifies distributed temperature sensing applications
â€˘ Requires no external components
â€˘ Â±0.5Â°C accuracy from â€“10Â°C to +85Â°C
â€˘ Measures temperatures from â€“55Â°C to +100Â°C (â€“67Â°F to +212Â°F)
â€˘ 9-bit thermometer resolution
â€˘ Converts temperature in 750 ms (max.)
â€˘ Userâ€“definable non-volatile temperature alarm settings
â€˘ Alarm search command identifies and addresses devices whose temperature is outside of programmed limits (temperature alarm condition)
â€˘ Ideal for use in remote sensing applications (e.g., temperature probes) that do not have a local power source