DS2502P-E48 ,48-Bit Node Address ChipDS2502-E4848-Bit Node Address Chip
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DS2502P-E48
48-Bit Node Address Chip
FEATURESFactory programmed 48-bit node address
chip with 768 bits user-programmable OTP-
EPROM communicates with the economy of
one signal plus groundProvides valid MAC-48/EUI-48
ETHERNET addressUnique, factory lasered and tested 64-bit
registration number assures absolute
traceability because no two parts are alikeBuilt-in multidrop controller ensures
compatibility with other 1-Wire® productsDevice is an “add-only” memory where
additional data can be programmed into
EPROM without disturbing existing dataReduces control, address, data, power and
programming signals to a single pinDirectly connects to a single port pin of a
microprocessor and communicates at up to
16.3kbpsPresence detector acknowledges when reader
first applies voltageLow cost TO-92 or TSOC surface mount
packagesReads over a wide voltage range of 2.8V to6.0V from -40°C to +85°C; programs at
11.5V to 12.0V from -40°C to + 50°C
PIN CONFIGURATION
TO-92
BOTTOM VIEW
TSOC PACKAGE
TOP VIEW
ORDERING INFORMATIONDS2502-E48 TO-92 package
DS2502P-E48 TSOC package
DS2502P-E48/T&RTape-and-Reel version of
DS2502P-E48
GLOBAL IDENTIFIER DESCRIPTIONThe DS2502-E48 is a variant of the DS2502 1024-bit add-only memory. It differs from the standardDS2502 in its custom ROM family code 89H, and the UniqueWare Identifier 5E7H in place of the upper
12 bits of the standard ROM serialization field. Otherwise, the electrical and logical behavior is identical
to that of the DS2502. For technical details please refer to the DS2502 data sheet.
DS2502-E48
48-Bit Node Address Chip1-Wire is a registered trademark of Dallas Semiconductor.
DS2502-E48
The first 32 bytes of the DS2502-E48’s EPROM memory contain a globally unique 48-bit node address
and are write-protected. The data structure follows the conventions of UniqueWare devices using Default
Data Structure (Figure 1).
Figure 1. NODE ADDRESS CHIP DATA STRUCTUREhigh addresslow address
The data record starts with a length byte (0AH) and the 4-byte UniqueWare Project ID 00001129H. Thenext 6 bytes contain the 48-bit node address which consists of an incrementing 24-bit extension identifier
and the IEEE-assigned 24-bit company ID value 006035H. A 16-bit CRC ends the data record. The
remaining bytes of the 32-byte memory page remain unprogrammed. Neither the 24-bit extension
identifier nor the 24-bit company ID are related to the 64-bit ROM registration number. The ROM
registration number is used to provide a unique address to access the DS2502-E48 when multidropped ona 1-Wire bus.
The company ID value 006035H has been assigned by the IEEE to Dallas Semiconductor. If a different
company ID value is required, See App Note 99: UniqueWare Project Setup Manual.
http://dbserv.maxim-ic.com/appnotes.cfm/appnote_number/518/ln/en
EXAMPLEAssume that a manufacturer’s company ID value is 006035H and the 24-bit extension identifier is
67ABCDH. The 48-bit node address value generated from these two numbers is 00603567ABCDH,
whose byte and bit representations are illustrated in Figure 2.
Figure 2. SAMPLE NODE ADDRESS VALUEHEXBINARY
This information is stored in the DS2502-E48 as 48-bit number with the least significant byte at the lower
address. Including the length byte and the CRC, the complete set of data is shown in Figure 3.
Figure 3. PHYSICAL ADDRESS AND DATA MAPPING INSIDE THE DEVICEXX XX = CRC16, value depends on actual data
The four bytes at memory addresses 01 to 04 contain the UniqueWare Project ID 00001129H. The two
bytes at addresses 0BH and 0CH are the 16-bit CRC over the length byte, Project ID and node address
value. The least significant byte of the CRC is stored at address 0B. This CRC is generated according tothe standardized CRC16 polynomial function X16 + X15 + X2 + 1. For more details on generating CRC
values including examples in both hardware and software, see Application Note 27.
The contents of the memory address range 0DH to 1FH is FFH. These cells cannot be altered since the
whole memory page is write-protected. The memory range from 20H to 7FH, however, is user-
programmable. It can be write-protected by programming the corresponding write-protect bit in the status
This datasheet has been :
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