Product Specification

smart card tm1991l-f5 iButon 1052 bit

     TM1991L-F5 multi-key

 1,152-bit secure read/write, nonvolatile memory

 Secure memory cannot be deciphered without matching 64-bit password

 Memory is partitioned into 3 blocks of 384bits each

 64-bit password and ID fields for each memory block

 512-bit scratchpad ensures data transfer integrity

 Operating temperature range: -40°C to +70°C

 Over 10 years of data retention

 Easily affixed with self-stick adhesive backing, latched by its flange, or locked with a ring  pressed onto its rim

 Presence detector acknowledges when readerfirst applies voltage

 TM1991L full compatible with ds1991L

COMMON Button FEATURES
Unique, factory-lasered and tested 64-bit registration number (8-bit family code + 48- bit serial number + 8-bit CRC tester) assures absolute traceability because no two parts are alike
Multidrop controller for MicroBUS
Digital identification and information by momentary contact
Chip-based data carrier compactly stores information
Data can be accessed while affixed to object
Economically communicates to bus master with a single digital signal at 16.3k bits per second
Standard 16 mm diameter and 1-Bus protocol ensure compatibility with Button family ? Button shape is self-aligning with cup- shaped 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

Button DESCRIPTION
The TM1991 MultiKey Button is a rugged read/write data carrier that acts as three separate electronic keys, offering 1,152 bits of secure, nonvolatile memory. Each key is 384 bits long with distinct 64-bit password and public ID fields (Figure 1). The password field must be matched in order to access the secure memory. Data is transferred serially via the 1-Bus protocol, which requires only a single data lead and a ground return. The 512-bit scratchpad serves to ensure integrity of data transfers to secure memory. Data should first be written to the scratchpad where it can be read back. After the data has been verified, a copy scratchpad command will transfer the data to the secure memory. This process ensures data integrity when modifying the memory. A 48-bit serial number is factory lasered into each TM1991 to provide a guaranteed unique identity which allows for absolute traceability. The family code for the TM1991 is 02h. The durable MicroCan package is highly resistant to environmental hazards such as dirt, moisture and shock. Its compact button-shaped profile is self-aligning with mating receptacles, allowing the TM1991 to be easily used by human operators. Accessories permit the TM1991 to be mounted on plastic key fobs, photo-ID badges, printed-circuit boards or any smooth surface of an object. Applications include secure access control, debit tokens, work-in-progress tracking, electronic travelers and proprietary data. OPERATION The TM1991 is accessed via a single data line using the 1-Bus protocol. The bus master must first provide one of the four ROM Function Commands, 1) Read ROM, 2) Match ROM, 3) Search ROM, 4) Skip ROM. These commands operate on the 64-bit lasered ROM portion of each device and can singulate a specific device if many are present on the 1-Bus line as well as indicate to the bus master how many and what types of devices are present. The protocol required for these ROM Function Commands is described in Figure 9. After a ROM Function Command is successfully executed, the memory functions that operate on the secure memory and the scratchpad become accessible and the bus master may issue any one of the six Memory Function Commands specific to the TM1991. The protocol for these Memory Function Commands is described in Figure 5. All data is read and written least significant bit first.

OPERATION
The TM1991 is accessed via a single data line using the 1-Bus protocol. The bus master must first provide one of the four ROM Function Commands, 1) Read ROM, 2) Match ROM, 3) Search ROM, 4) Skip ROM. These commands operate on the 64-bit lasered ROM portion of each device and can singulate a specific device if many are present on the 1-Bus line as well as indicate to the bus master how many and what types of devices are present. The protocol required for these ROM Function Commands is described in Figure 9. After a ROM Function Command is successfully executed, the memory functions that operate on the secure memory and the scratchpad become accessible and the bus master may issue any one of the six Memory Function Commands specific to the TM1991. The protocol for these Memory Function Commands is described in Figure 5. All data is read and written least significant bit first