DS2505(3)

NAME
DS2505, DS2505-UNW - Add-Only Memory (16 kBit), UniqueWare Add-Only Memory (16 kBit)

DS1985, DS1985U
    - Add-Only iButton (16 kBit), UniqueWare iButton (16 kBit)

SYNOPSIS
EPROM add-only memory.

0B [.]XXXXXXXXXXXX[XX][/[ memory | pages/page.[0-63|ALL] | ]]

8B [.]XXXXXXXXXXXX[XX][/[ memory | pages/page.[0-63|ALL] | ]]

FAMILY CODE

0B  DS2505 DS1985

8B  DS2505-UNW DS1985U

SPECIAL PROPERTIES

  memory
read-write, binary
2048 bytes of memory. Initially all bits are set to 1. Writing zero permanently alters the memory.

  pages/page.0 ... pages/page.63 pages/page.ALL
read-write, yes-no
Memory is split into 64 pages of 32 bytes each. ALL is an aggregate of the pages. Each page is accessed sequentially.

STANDARD PROPERTIES

ALARMS
None.

DESCRIPTION

  DS2505 DS1985
The DS2505 (3) is used for write-once incremental storage. It's main advantage is for audit trails (i.e. a digital purse).

The DS2505-UNW is one 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/DS2505.pdf
http://pdfserv.maxim-ic.com/en/ds/DS2502-UNW-DS2506S-UNW.pdf
http://pdfserv.maxim-ic.com/en/ds/DS1985-F3-DS1985-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)