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Product Attributes

Introduction

The HT18B20A 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 HT18B20A communicates over a 1-Wire bus that by definition requires only one data line (and ground) for communication with a central microprocessor. In addition, the HT18B20A can derive power directly from the data line ("parasite power"), eliminating the need for an external power supply. Each HT18B20A has a unique 64-bit serial code, which allows multiple HT18B20As to function on the same 1-Wire bus. Thus, it is simple to use one microprocessor to control many HT18B20As distributed over a large area.

Features

• converts temperature to 12-bit digital code
• user-programmable thermometer accuracy from 9 to 12 bits
• operating temperature range from minus 55 to plus 125°C
• alarm signal on temperature is outside of programmed limits
• each IC has a unique 64-bit serial code unchangeable by user
• memory data read/write, data transmitting via 1-Wire interface
• battery and data line power supply available
• supply voltage UDD range from 3.0 to 5.5V
• acceptable value of ESD protection not less than 2000

Applications

• Thermostatic Controls
• Industrial Systems
• Consumer Products
• Thermometers
• Thermally Sensitive Systems