DS2502/5/6–UNW
UniqueWareTM Add–Only Memory
DS2502/5/6–UNW
081298 1/2
SPECIAL FEATURES
•1024 bits, 16K bits or 64K bits Electrically Program-
mable Read Only Memory (EPROM) communicates
with the economy of one signal plus ground
•Unique, factory–lasered and tested 64–bit registration
number (8–bit family code, 36–bit serialization, 12–bit
UniqueWare Identifier 5E7H, 8–bit CRC–tester)
assures absolute traceability because no two parts are
alike.
•Built–in multidrop controller ensures compatibility with
other MicroLAN products
•EPROM partitioned into two 256–bit pages for randomly
accessing packetized data records
•Each memory page can be permanently write–pro-
tected to prevent tampering
•Device is an “add only” memory where additional data
can be programmed into EPROM without disturbing
existing data
•Reduces control, address, data, power and program-
ming signals to a single pin
•Directly connects to a single port pin of a microproces-
sor and communicates at up to 16.3k bits per second
•Presence detector acknowledges when reader first
applies voltage
•Low cost TO–92/PR–35 or 8–pin SOIC and TSOC sur-
face mount packages
•Reads over a wide voltage range of 2.8V to 6.0V from
–40°C to +85°C
321
TO–92/PR–35
BOTTOM VIEW
1
2
3
4
8
7
6
5
TSOC PACKAGE
123
654
TOP VIEW
3.7 X 4.0 X 1.5 mm
8–Pin SOIC
321
See Mech. Drawings
Section See Mech. Drawings
Section
See Mech. Drawings
Section
PIN ASSIGNMENT
TO–92/PR–35 TSOC SOIC
Pin 1 Ground Ground NC
Pin 2 Data Data NC
Pin 3 NC NC Data
Pin 4 –––– NC Ground
Pins 5 to 8 –––– NC NC
SILICON LABEL DESCRIPTION
UniqueWare Add–Only Memories are factory pro-
grammed versions of the DS2502 (1024 bit), the
DS2505 (16K bit) and the DS2506 (64K bit) Add–Only
Memories, respectively. They differ from the regular
devices in their custom ROM family codes (see Order-
ing Information) and the UniqueWare Identifier 5E7 in
place of the upper 12 bits of the standard serialization
field. For technical details on the devices please refer to
the DS2502, DS2505 and DS2506 data sheets.
UniqueWare Add–Only Memories are only available
preprogrammed with customer–specific and write–pro-
tected data. UniqueWare data fills at least one but no
more than the first four pages of a device, depending on
the length of the customer–supplied data. This leaves
up to three (DS2502–UNW), 63 (DS2505–UNW) or 255
(DS2506–UNW) memory pages available for program-
ming in the application.
For more details on UniqueWare and how to set up data
files, please refer to the UniqueWare Project Setup
Manual, available as Application Note 99 from Dallas
Semiconductor. The UniqueWare Project Setup Soft-
ware is availble from the Dallas Semiconductor FTP
Site at
ftp://ftp.dalsemi.com/pub/auto_id, unwsetup.exe.
DS2502/5/6–UNW
081298 2/2
ORDERING INFORMATION
Memory Size Family Code Package Ordering Part Number
1024 bits
(4 pages) 89h TO–92 package
8–pin 150 mil SOIC pkg.
6–pin TSOC package
DS2502–UNW–pppp
DS2502S–UNW–pppp
DS2502P–UNW–pppp
16K bits
(64 pages) 8Bh TO–92 package
6–pin TSOC package DS2505–UNW–pppp
DS2505P–UNW–pppp
64K bits
(256 pages) 8Fh PR–35 package
8–pin 208 mil SOIC pkg. DS2506–UNW–pppp
DS2506S–UNW–pppp
pppp stands for the Project ID assigned to each individual data pattern at the time of the first order.
Sample UniqueWare Data Structures
SAMPLE 1: ETHERNET NODE ADDRESS Figure 1a
(unused) CRC16 Company ID Value Extension ID Value Project ID Length
MSB LSB MSB LSB MSB LSB MSB LSB
19 bytes
FFH 2 bytes 3 bytes constant
assigned by IEEE 3 bytes serialization 4 bytes
constant 1 byte
0AH
high address low address
PHYSICAL ADDRESS AND DATA MAPPING Figure 1b
ADDRESS 0C 0B 0A 09 08 07 06 05 04 03 02 01 00
DATA xx xx ch cm cl hh mm ll 00 00 pp pp 0A
xx xx = CRC16, value depends on actual data
ch cm cl = high, medium and low byte of the IEEE assigned “Company ID”
hh mm ll = high, medium and low byte of the “Extension ID” or serialization
pp pp = Project ID assigned by Dallas Semiconductor
SAMPLE 2: EUI–64 FireWireTM NODE ADDRESS Figure 2a
(unused) CRC16 Company ID Value Extension ID Value Project ID Length
MSB LSB MSB LSB MSB LSB MSB LSB
17 bytes
FFH 2 bytes 3 bytes constant
assigned by IEEE 5 bytes serialization 4 bytes
constant 1 byte
0CH
high address low address
PHYSICAL ADDRESS AND DATA MAPPING Figure 2b
ADDRESS 0E 0D 0C 0B 0A 09 08 07 06 05 04 03 02 01 00
DATA xx xx ch cm cl hh hm mm ml ll 00 00 pp pp 0C
xx xx = CRC16, value depends on actual data
ch cm cl = high, medium and low byte of the IEEE assigned “Company ID”
hh hm mm ml ll = high, medium and low byte of the “Extension ID” or serialization
pp pp = Project ID assigned by Dallas Semiconductor
FireWireTM is a trademark of Apple Computer, Inc.
