The DS2502-E64 is a variant of the DS2502 1024-bit add-only memory. It differs from the standard DS2502 in its custom ROM family code 89H, and the UniqueWare™ identifier 5E7 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. The first 32 bytes of the DS2502-E64's EPROM memory contain a globally unique 64-bit node address (EUI-64) and are write-protected. The data structure follows the conventions of UniqueWare devices using default data structure (Figure 1 of data sheet).
The data record starts with a length byte (0CH) and the 4-byte UniqueWare project ID 00001128H. The next eight bytes contain the EUI-64 global identifier (node address), which consists of an incrementing 40-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 40-bit extension identifier nor the 24-bit company ID are related to the 64-bit ROM registration number, which is distinct from the IEEE standard 1394-1995 node address. The ROM registration number is used to provide a unique address to access the DS2502-E64 when multidropped on a 1-Wire® bus.
关键特性
IEEE-approved factory programmed 64-bit node address chip (EUI-64) with 768 bits user-programmable OTP-EPROM communicates with the economy of one signal plus ground
Meets the node identification requirements of IEEE standard 1394-1995 (FireWire™)
Unique, factory-lasered 64-bit registration number assures absolute traceability because no two parts are alike
Built-in multidrop controller ensures compatibility with other 1-Wire products
Device is an add-only memory where additional data can be programmed into EPROM without disturbing existing data
Reduces control, address, data, power, and programming signals to a single pin
Directly connects to a single port pin of a microprocessor and communicates at up to 16.3kbps
Low cost TO-92 or TSOC surface mount packages
Reads over a wide voltage range of 2.8V to 6.0V from -40°C to +85°C; programs at 11.5V to 12.0V from -40°C to +50°C
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