iButton ds1990a-f5 congtact information button smart card touch memory
TM1990A SPECIAL FEATURES
•TM1990A is fully compatible with DS1990A, DS1990R and i1990A
• Unique 48–bit serial number
• Low-cost electronic key for access control
• 8-bit CRC for checking data integrity
• Can be read in less than 5 ms
•Operating temperature range of -40°C to +85°C
COMMON INFORMATION BUTTON FEATURES
•Unique, factory-lasered and tested 64-bit
•Multi-drop controller for Micro LAN.
•Digital identification by momentary contact.
•Chip-based data carrier compactly stores information.
•Data can be accessed while affixed to an object.
•Economically communicates to bus master with a single digital signal at 16.3k bits per second.
•Standard 16 mm diameter and 1-Wire protocol ensure compatibility with INFORMATION BUTTON family.
•Button shape is self-aligning with cupshaped probes.
•Durable stainless steel case engraved with registration number withstands harsh environments.
•Easily affixed with self-stick adhesive backing, latched by its flange, or locked with a ring pressed onto its rim.
•Presence detector acknowledges when reader first applies voltage
