DS1986U

 1024 bits, 16K bits or 64K bits Electrically Programmable Read Only Memory (EPROM) communicates with the     economy of one signal plus ground
Unique, factory lasered and tested 64bit registration number (8bit family code, 36bit serialization, 12bit     UniqueWare Identifier 5E7H, 8bit CRC tester) assures absolute traceability because no two parts are alike
EPROM partitioned into 256bit pages for randomly accessing packetized data records
Each memory page can be permanently writeprotected 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 programming signals to a single pin
8bit family code specifies device communications requirements to reader
Presence detector acknowledges when reader first applies voltage
Reads over a wide voltage range of 2.8V to 6.0V from 40°C to +85°C

UniqueWare iButtons DS1986U are factory programmed versions of the DS1982 (1024 bit), the DS1985 (16K bit) and the DS1986 (64K bit) AddOnly iButtons, respectively. They differ from the regular devices in their custom ROM family codes (see Ordering 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 DS1982, DS1985 and DS1986 data sheets.

UniqueWare AddOnly iButtons DS1986U are only available preprogrammed with customerspecific and write protected data. UniqueWare data fills at least one but no more than the first four pages of a device, depending on the length of the customersupplied data. This leaves up to three (DS1982U), 63 DS1985U) or 255 (DS1986U) memory pages available for programming 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 DS1986U UniqueWare Project Setup Software is available from the Dallas Semiconductor FTP Site at ftp://ftp.dalsemi.com/pub/auto_id, file name "unwsetup.exe".