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ST25TB02K Datasheet(PDF) 19 Page - STMicroelectronics

No. de pieza ST25TB02K
Descripción Electrónicos  13.56 MHz short-range contactless memory chip with 2048-bit EEPROM and anticollision functions
PDF  47 Pages
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Fabricante Electrónico  STMICROELECTRONICS [STMicroelectronics]
Página de inicio  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST25TB02K Datasheet(HTML) 19 Page - STMicroelectronics

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Figure 17. Description of a possible anticollision sequence
Slot 0
Slot 1
Reader
ST25TBxxx
devices
Timing
t0+t1
Comment
Time
Collision
Slot 2
S
O
F
...
Slot N
t2
t0+t1
t2
No
collision
t3
Answer
Chip_ID
X0h
S
O
F
E
O
F
Answer
Chip_ID
X1h
S
O
F
E
O
F
Answer
Chip_ID
X1h
S
O
F
E
O
F
Slot
Marker
(15)
S
O
F
E
O
F
Slot 15
Answer
Chip_ID
XFh
S
O
F
E
O
F
E
O
F
PCALL 16
Request
S
O
F
Slot
Marker
(1)
S
O
F
E
O
F
Slot
Marker
(2)
S
O
F
E
O
F
...
E
O
F
No
collision
No
Answer
t0+t1
t2
t2
1.
The value X in the answer Chip_ID means a random hexadecimal character from 0 to F.
7.1
Description of an anticollision sequence
The anticollision sequence is initiated by the Initiate() command which triggers all the ST25TB02K devices that
are present in the reader field range, and that are in Inventory state. Only ST25TB02K devices in Inventory state
will respond to the Pcall16() and Slot_marker(SN) anticollision commands.
A new ST25TB02K introduced in the field range during the anticollision sequence will not be taken into account
as it will not respond to the Pcall16() or Slot_marker(SN) command (Ready state). To be considered during the
anticollision sequence, it must have received the Initiate() command and entered the Inventory state.
Table 8 shows the elements of a standard anticollision sequence. (See Table 9 for an example.)
ST25TB02K
Description of an anticollision sequence
DS11469 - Rev 7
page 19/47



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