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
