Dallas Semiconductor

DS1820 - High Precision 1-Wire Digital Thermometer

Photograph

Features Unique 1-wire interface requires only one port pin for communication Each device has a unique 64-bit serial code stored in an on-board ROM Multi-drop capability simplifies distributed temperature sensing applications Requires no external components 2-wire serial interface 9-bit thermometer resolution Converts temperature in 750 ms (max.)

Pin Description Pin Number Description 1 GND - Ground 2 DQ - Data In/Out 3 Vdd - Optional Vdd

Pin Layout Dimensional Drawing

Technical Data Data Sheet Dallas Semiconductor - Data Sheet for DS1820 Application Notes Dallas Semiconductor - App Note 162: Interfacing the DS18X20/DS1822 1-Wire Temperature Sensor in a Microcontroller Environment Dallas Semiconductor - App Note 104: Minimalist Temperature Control Demo Dallas Semiconductor - App Note 122: Using Dallas' 1-Wire Chips in 1-Cell Li+ Battery Packs With Low-Side n-Channel Safety FETs Master Dallas Semiconductor - App Note 155: 1–Wire Software Resource Guide