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)
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 | ]]
|
09 |
DS2502 DS1982 |
|||
|
89 |
DS2502-UNW DS2502-E48 DS1982U |
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.
read-write,
binary
128 bytes of memory. Initially all bits are set to 1.
Writing zero permanently alters the memory.
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.
read-only,
binary
32 bit project id. Constant 0x0000 for ethernet and
0x00001128 for firewire. See Datasheets.
None.
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.
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
http://www.owfs.org
Paul Alfille ([email protected])