GXCAS GX18B20S

The GX18B20 digital thermometer provides 9-bit to 12-bit Celsius temperature measurements and has an alarm function with nonvolatile user-programmable upper and lower trigger points. The GX18B20 communicates over a 1-Wire bus that by definition requires only one data line (and ground) for communication with a central microprocessor. It has an operating temperature range of -55℃ to +125℃ and is accurate to ±0.4℃ over the range of -10℃ to +85℃. In addition, the GX18B20 can derive power directly from the data line ("parasite power"), eliminating the need for an external power supply. Each GX18B20 has a unique 64-bit serial code, which allows multiple GX18B20s to function on the same 1-Wire bus. Thus, it is simple to use one microprocessor to control many GX18B20s 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.

• 1-Wire Interface Requires Only One Port Pin for Communication
• Each chip has an independent 64-bit serial number
• Multidrop Capability Simplifies Distributed Temperature-Sensing Applications
• Requires No External Components
• Can be powered by the data line. the supply voltage range is: 2.5V - 5.5V
• Measuring Range: -55°C to +125°C (-67°F to +257°F)
• ±0.4°C Accuracy from -10°C to +85°C
• Thermometer Resolution is User Selectable from 9 to 12 Bits
• Converts Temperature to 12-Bit Digital Word in 750ms (Max)
• User-Definable Nonvolatile (NV) Alarm Settings
• Alarm Search Command Identifies and Addresses Devices Whose Temperature is Outside Programmed Limits
• Available in MSOP8, SOP8 and 3-Pin TO-92, TO92S, TO92A Packages

• temperature control
• industrial system
• consumer goods
• grain temperature measurement
• thermometer
• any thermal system