GX18B20H

1.FEATURES 
• 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) 
• ±0.1°C Accuracy from 0°C to +50° 
• 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 and 3-Pin TO-92,Packages 
 
2.Application Scenario 
• temperature control 
• industrial system 
• consumer goods 
• grain temperature measurement 
• thermometer 
• any thermal system 

3.DESCRIPTION 
The GX18B20H 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 GX18B20H 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° C to +125° C and is accurate to ±0.1°C over the range of 0° C to +50° C. In addition, the GX18B20H can derive power directly from the data line (“parasite power”), eliminating the need for an external power supply. Each GX18B20H has a unique 64-bit serial code, which allows multiple GX18B20Hs to function on the same 1-Wire bus. Thus, it is simple to use one microprocessor to control many GX18B20Hs 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. 

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