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DS2502(3)		     One-Wire File System		     DS2502(3)

NAME
       DS2502 - Add-Only Memory (1 kBit)

       DS2502-E48, DS2502-UNW
	      - 48-bit Node Address Chip, UniqueWare Add-Only Memory (1 kBit)

       DS1982, DS1982U
	      - Add-Only iButton (1 kBit), UniqueWare iButton (1 kBit)

SYNOPSIS
       EPROM add-only memory.

       09 [.]XXXXXXXXXXXX[XX][/[ memory | pages/page.[0-3|ALL] | ]]

       89    [.]XXXXXXXXXXXX[XX][/[    mac_e	|    mac_fw    |    memory   |
       pages/page.[0-3|ALL] | project | ]]

FAMILY CODE
       09     DS2502 DS1982

       89     DS2502-UNW DS2502-E48 DS1982U

SPECIAL PROPERTIES
   mac_e mac_fw
       read-only, binary
       64 bit or 80 bit media access control number. Unique, and unrelated  to
       the  1-wire  address.  It  is  apparently used for ethernet or FireWire
       addressing, respectively.

   memory
       read-write, binary
       128 bytes of memory. Initially all bits are set to 1. Writing zero per‐
       manently alters the memory.

   pages/page.0 ... pages/page.3 pages/page.ALL
       read-write, yes-no
       Memory  is split into 4 pages of 32 bytes each.	ALL is an aggregate of
       the pages. Each page is accessed sequentially.

   project
       read-only, binary
       32 bit project id. Constant 0x0000 for  ethernet	 and   0x00001128  for
       firewire. See Datasheets.

STANDARD PROPERTIES
ALARMS
       None.

DESCRIPTION
   DS2502 DS1982
       The  DS2502  (3)	 is used for write-once incremental storage. It's main
       advantage is for audit trails (i.e. a digital purse).

       The DS2502-E48 and DS2502-UNW are  some	of  the	 UniqueWare  class  of
       devices.	 Some  of  the memory was preprogramed at the factory. See the
       datasheet for specifics.	 The DS2502 , DS2505 , and  DS2506  differ  in
       their  function	by  the	 amount	 of on-board memory they possess. (The
       internal protocols are slightly different, but the OWFS system  handles
       this automatically.

ADDRESSING
DATASHEET
       http://pdfserv.maxim-ic.com/en/ds/DS2502.pdf
       http://pdfserv.maxim-ic.com/en/ds/DS2502-E48.pdf
       http://pdfserv.maxim-ic.com/en/ds/DS2502-UNW-DS2506S-UNW.pdf
       http://pdfserv.maxim-ic.com/en/ds/DS1982-F3-DS1982-F5.pdf
       http://pdfserv.maxim-ic.com/en/ds/DS1982U-DS1986U.pdf

SEE ALSO
AVAILABILITY
       http://www.owfs.org

AUTHOR
       Paul Alfille (paul.alfille@gmail.com)

OWFS Manpage			     2003			     DS2502(3)

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