User's Manual

5 – 3
Description of the data carrier
D101583 0207 BL ident
5
Function principle
The BLident data carriers (TAGs) can be written and read on a non-
contact basis using the corresponding read-write heads. The
operating frequency is 13.56 MHz.
The data carriers are passive, i.e. without batteries. If the data
carriers enter the transfer range of a read-write head, the energy is
inductively coupled and the data transfer is initiated.
The achievable distances vary depending on the sizes from
15…200 mm. All housing styles (with the exception of the
TW-R16...-B128, EEPROM only) are available both as EEPROM
and FRAM memory variants. The BLident data carrier consists of
a memory module, electronics and an antenna (see Fig. 1).
Memory module
The information on the data carrier can be read – and new data can
also be added (read/write). The memory size is 64 Bytes, 128 Bytes
or 2 KBytes.
The memory consists alternatively of the following components:
 EEPROM: unlimited read but limited write cycles are possible
(10
5
). No battery required.
 FRAM = ferroelectric memory: unlimited read and almost
unlimited write cycles are possible (10
10
). No battery required.
Figure 1
Block diagram
Data carrier
U
B
modulator
demodulator
control logicsmemory
read/write