All iButton button memories have a unique laser-engraved serial number. Easy to implement e.g. access control and electric lock control.

• sturdy metal-cased button-shaped ROM memory
• multiple iButtons can be on the same OneWire bus
• total 64-bit key
  • 8-bit identification number
  • 48-bit serial number
  • 8-bit CRC checksum
• read occurs in under 5 milliseconds (16.3kbps link)
• operating temperature: -40°...+85°C
• F5 Microcan dimensions: approx Ø 17 x 6 mm