| DS1921G Description | | Thermochron iButton | | DS1921G Vendor | | Maxim | | DS1921G Categories | | | 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 | | | 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 band0.5°C Resolution2048-Byte Temperature Log63-bin Temperature HistogramHigh/Low Temperature Alarms | | Package | F5 | | Price @ 1k | $9.50 |
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