DS1921G
DS1921G Description
Thermochron iButton
DS1921G Vendor
Maxim
DS1921G Categories
Digital Thermometers & Thermostats
DS1921G Features
Digital thermometer measures temperature 0.5°C increments
Accuracy ±1°C from -30°C to +70°C. See EC table for accuracy specification
Built-in real-time clock (RTC) and timer has accuracy of ±2 minutes per month per month from 0°C to 45°C
Automatically wakes up and measures temperature at user-programmable intervals from 1 to 255 minutes
Logs up to 2048 consecutive temperature measurements in protected nonvolatile (NV) random access memory
Records a long-term temperature histogram with 2.0°C resolution
Programmable temperature-high and temperature-low alarm trip points
Records up to 24 time stamps and durations when temperature leaves the range specified by the trip points
512 bytes of general-purpose read/write NV random access memory
Communicates to host with a single digital signal at 15.4kbits or 125kbits per second using 1-Wire ® protocol
Common iButton features:
Digital identification and information by momentary contact
Unique, factory-lasered and tested 64-bit reg-istration number (8-bit family code + 48-bit serial number + 8-bit CRC tester) assures ab-solute traceability because no two parts are alike
Multidrop controller for 1-Wire net
Chip-based data carrier compactly stores information
Data can be accessed while affixed to object
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 (application pending)
DS1921G Datasheet and Application Notes
DS1921G Datasheet
Parameter Value
Memory Type NV RAM
Memory Size 4K bits
Temperature Logger -40C to +85C
Other ±1°C Accuracy -30C to 70C, ±1.3C outside this band
0.5°C Resolution
2048-Byte Temperature Log
63-bin Temperature Histogram
High/Low Temperature Alarms
Package F5
Price @ 1k $9.50
