The DS1920 Temperature iButton provides 9-bit temperature readings, which indicate the temperature of the device. Information is sent to/from the DS1920 over a 1-Wire interface. Power for reading, writing, and performing temperature conversions is derived from the data line itself. Because each DS1920 contains a unique silicon serial number, multiple DS1920s can exist on the same 1-Wire bus. This allows for placing temperature sensors in many different places. Applications where this feature is useful include HVAC environmental controls, sensing temperatures inside buildings, equipment or machinery, and in process monitoring and control.
Features
- Temperature range from -55°C to +100°C
- Measures temperature in 0.5°C increments
- Zero Standby Power
- Access to Internal Counters Allows Increased Resolution Through Interpolation
- Reduces control, Address, Data, and Power to a Single Data Contact
- 8-Bit Device-Generated CRC for Data Integrity
- 8-Bit Family Code Specifies DS1920 Communications Requirements to Reader
- Special Command Set Allows User to Skip ROM Section and Perform Temperature Measurements Simultaneously for All Devices on the Bus
- 2 Bytes of EEPROM to Be Used Either as Alarm Triggers or User Memory
- Alarm Search Directly Indicates Which Device Senses Alarming Temperatures
Common iButton Features
- Unique, factory-lasered and tested 64-bit registration number (8-bit family code + 48-bit serial number + 8-bit CRC tester) assures absolute traceability because no two parts are alike
- Multidrop controller for MicroLAN
- Digital identification and information by momentary contact
- Chip-based data carrier compactly stores information
- Data can be accessed while affixed to object
- Economically communicates to host with a single digital signal at 16.3k bits per second
- Standard 16 mm diameter and 1-Wire® protocol ensure compatibility with iButton® Device family
- Button shape is self-aligning with cup-shaped probes
- Durable stainless steel case engraved with registration number withstands harsh environments
- Easily affixed with self-stick adhesive backing, latched by its flange, or locked with a ring pressed onto its rim
- Presence detector acknowledges when reader first applies voltage
- Meets UL#913 (4th Edit.). Intrinsically Safe Apparatus: approved under Entity Concept for use in Class I, Division 1, Group A, B, C and D Locations
F5 MicroCAN
