DS2502P-UNW-115D+T – DALLAS

The DS2502P-UNW-115D+T is a 1Kb Add-Only Memory iButton device manufactured by Dallas Semiconductor/Maxim Integrated. It provides a unique, factory-lasered 64-bit registration number (ROM ID) that serves as a node address in a MicroLAN environment. The 1Kb of EEPROM memory is organized as four 256-bit pages and is designed for write-once applications, preventing accidental overwrites. The “D/C 0828” marking indicates a date code of week 28 of 2008. The “+T” suffix signifies that the device is supplied in a tape and reel format for automated assembly. The device operates within a voltage range of 2.8V to 6.0V and communicates via the single-contact 1-Wire protocol. The UNW designation likely refers to a specific packaging or testing variant within the DS2502P product family, although precise details require further manufacturer documentation. The device is RoHS compliant, indicating adherence to Restriction of Hazardous Substances directives.