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DS1982 - 1Kb Add-Only iButton

Key Features

  • 1024 bits Electrically Programmable ReadOnly Memory (EPROM) communicates with the economy of one signal plus ground.
  • EPROM partitioned into four 256-bit pages for randomly accessing packetized data.
  • 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.
  • Architecture allows software to patch data by superseding an old page in favor of a ne.

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Other Datasheets by Maxim Integrated (now Analog Devices)

Part Number Description
DS1985 16Kb Add-Only iButton
DS1904 RTC iButton
DS1920 Temperature iButton
DS1921G Thermochron iButton Device
DS1921H High-Resolution Thermochron iButton Devices

Full PDF Text Transcription (Reference)

The following content is an automatically extracted verbatim text from the original manufacturer datasheet and is provided for reference purposes only.

View original datasheet text
19-4891; Rev 8/09 SPECIAL FEATURES  1024 bits Electrically Programmable ReadOnly Memory (EPROM) communicates with the economy of one signal plus ground  EPROM partitioned into four 256-bit pages for randomly accessing packetized data  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  Architecture allows software to patch data by superseding an old page in favor of a newly programmed page  Reduces control, address, data, power, and programming signals to a single data pin  8-bit family code specifies DS1982 communications requirements to reader  Reads over a wide voltage range of 2.8V to 6.0V from -40°C to +85°C; programs at 11.5V to 12.