UniqueWare™ iButtons® are factory programmed versions of the DS1982 (1024-bit), the DS1985 (16kbit) and the DS1986 (64kbit) Add-Only 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 add-only iButtons are only available preprogrammed with customer-specific 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 customer-supplied 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 UniqueWare project setup software is available from the Dallas Semiconductor FTP site at http://files.dalsemi.com/auto_id, file name 'unwsetup.exe'.
关键特性
1024 bits, 16kbits or 64kbits electrically programmable read only memory (EPROM) communicates with the economy of one signal plus ground
Unique, factory lasered and tested 64-bit registration number (8-bit family code, 36-bit serialization, 12-bit UniqueWare identifier 5E7H, 8-bit CRC tester) assures absolute traceability because no two parts are alike
EPROM partitioned into 256-bit pages for randomly accessing packetized data records
Each memory page can be permanently write-protected 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
8-bit 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
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