DS28E05R+T

The DS28E05 is a 112-byte user-programmable EEPROM organized as 7 pages of 16 bytes each. Memory pages can be individually set to write protected or EPROM emulation mode through protection byte settings. Each part has its own guaranteed unique 64-bit ROM identification number (ROM ID) that is factory programmed into the chip. The DS28E05 communicates over Maxim Integrated’s single contact 1-Wire interface at overdrive speed with the ROM ID acting as node address in the case of a multiple-device 1-Wire network.

The DS28E05 combines 896 bits of user EEPROM organized as seven 128-bit pages, 64 bits of administrative data memory, and a 64-bit ROM ID in a single chip. Data is transferred serially through the 1-Wire protocol, which requires only a single data lead and a ground return.

The user memory can have unrestricted write access (factory default), or can be write protected or put in EPROM emulation mode. Write protection prevents changes to the memory data. EPROM emulation mode logically ANDs memory data with incoming new data, which allows changing bits from 1 to 0, but not vice versa. By changing one bit at a time this mode could be used to create nonvolatile nonresettable counters.

The device’s 64-bit ROM ID can be used to electronically identify the equipment in which the DS28E05 is used. The ROM ID guarantees unique identification and is also used to address the device in a multidrop 1-Wire network environment, where multiple devices reside on a common 1-Wire bus and operate independently of each other.