 The DS1993 iButton is a rugged read/write data carrier that acts
as a localized database, easily accessible with minimal hardware. The nonvolatile
memory and optional timekeeping capability offer a simple solution to storing and
retrieving vital information pertaining to the object to which the iButton
is attached. Data is transferred serially through the 1-Wire protocol that
requires only a single data lead and a ground return.The scratchpad is an additional
page that acts as a buffer when writing to memory. Data is first written to the
scratchpad where it can be read back. After the data has been verified, a copy scratchpad
command transfers the data to memory. This process ensures data integrity when modifying
the memory. A 48-bit serial number is factory lasered into each DS1993 to provide
a guaranteed unique identity that allows for absolute traceability. The durable MicroCan package is highly resistant to environmental hazards such as dirt, moisture,
and shock. Its compact coin-shaped profile is self-aligning with mating receptacles,
allowing the DS1993 to be easily used by human operators. Accessories permit the
DS1993 to be mounted on almost any surface including plastic key fobs, photo-ID
badges, and PC boards.
Applications include access control, work-in-progress tracking, electronic travelers,
storage of calibration constants, and debit tokens.
Key Features
- 4096 bits of read/write nonvolatile memory.
- 256-bit scratchpad ensures integrity of data transfer .
- Memory partitioned into 256-bit pages for packetizing data.
- Data integrity assured with strict read/write protocols.
- Operating temperature range from -40°C to +70°C.
- Over 10 years of data retention.
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 by momentary contact.
- Chip-based data carrier compactly stores information.
- Data can be accessed while affixed to an object.
- Economically communicates to bus master with a single digital signal at
16.3k bits per second.
- Standard 16 mm diameter and 1-Wire protocol ensure compatibility with iButton
family.
- Button shape is self-aligning with cupshaped 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 1, Division 1, Group A, B, C and D locations.
iButton and 1-Wire are registered trademarks of Dallas Semiconductor Corporation.
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