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DS1993 Schematic ( PDF Datasheet ) - Dallas Semiconductor

Teilenummer DS1993
Beschreibung (DS1992 / DS1993) 1kbit/4kbit Memory iButtonTM DS1994 4-kbit Plus Time Memory iButtonTM
Hersteller Dallas Semiconductor
Logo Dallas Semiconductor Logo 




Gesamt 17 Seiten
DS1993 Datasheet, Funktion
www.iButton.com
SPECIAL FEATURES
§ 4096 bits of Read/Write Nonvolatile
Memory (DS1993)
§ 1024 bits of Read/Write Nonvolatile
Memory (DS1992)
§ 256-bit Scratchpad Ensures Integrity of Data
www.DataSheet4TUr.caonmsfer
§ 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 and Information by
Momentary Contact
§ Chip-Based Data Carrier Compactly Stores
Information
§ Data Can be Accessed While Affixed to
Object
§ Economically Communicates to Bus Master
with a Single Digital Signal at 16.3kbps
§ Standard 16mm Diameter and 1-Wire®
Protocol Ensure Compatibility with iButton®
Family
§ Button Shape is Self-Aligning with Cup-
Shaped Probes
§ Durable Stainless Steel Case Engraved with
Registration Number Withstands Harsh
Environments
DS1992/DS1993
1kb/4kb Memory iButton
§ 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
5.89
0.36 0.51
© 1993
YYWW REGISTERED RR
DD 06
000000FBD804
16.25
17.35
IO
GND
All dimensions shown in millimeters.
ORDERING INFORMATION
DS1992L-F5
F5 MicroCan
DS1993L-F5
F5 MicroCan
EXAMPLES OF ACCESSORIES
DS9096P Self-Stick Adhesive Pad
DS9101 Multipurpose Clip
DS9093RA Mounting Lock Ring
DS9093F Snap-In Fob
DS9092 iButton Probe
1-Wire and iButton are registered trademarks of Dallas Semiconductor.
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DS1993 Datasheet, Funktion
DS1992/DS1993
Copy Scratchpad [55h]
This command is used to copy data from the scratchpad to memory. After issuing the copy scratchpad
command, the user must provide a 3-byte authorization pattern. This pattern must exactly match the data
contained in the three address registers (TA1, TA2, E/S, in that order). If the pattern matches, the AA
(Authorization Accepted) flag is set and the copy begins. A logic 0 is transmitted after the data has been
copied until the user issues a reset pulse. Any attempt to reset the part is ignored while the copy is in
progress. Copy typically takes 30ms.
The data to be copied is determined by the three address registers. The scratchpad data from the
beginning offset through the ending offset is copied to memory, starting at the target address. Anywhere
from 1 to 32 Bytes can be copied to memory with this command. Whole Bytes are copied even if only
partially written. The AA flag is cleared only by executing a write scratchpad command.
www.DataShReeet4aUd.comMemory [F0h]
The read memory command can be used to read the entire memory. After issuing the command, the user
must provide the 2-Byte target address. After the two Bytes, the user reads data beginning from the target
address and may continue until the end of memory, at which point logic 1’s are read. It is important to
realize that the target address registers contains the address provided. The ending offset/data status Byte
is unaffected.
The hardware of the DS1992/DS1993 provides a means to accomplish error-free writing to the memory
section. To safeguard reading data in the 1-Wire environment and to simultaneously speed up data
transfers, it is recommended to packetize data into data packets of the size of one memory page each.
Such a packet would typically store a 16-bit CRC with each page of data to ensure rapid, error-free data
transfers that eliminate having to read a page multiple times to determine if the received data is correct or
not. (See Application Note 114 for the recommended file structure to be used with the 1-Wire
environment.)
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DS1993 pdf, datenblatt
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DS1992/DS1993
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