E5551 Просмотр технического описания (PDF) - Temic Semiconductors
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E5551 Datasheet PDF : 21 Pages
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e5551
Maxblock Feature
If it is not necessary to read all user data blocks; the
MAXBLK field in block 0 can be used to limit the number
of blocks read. For example, if MAXBLK = 5, the e5551
repeatedly reads and transmits only blocks 1 to 5 (see
figure 11). If MAXBLK is set to ‘0’, block 0 – which is
normally not transmitted – can be read.
Terminators
The terminators are (optionally selectable) special
damping patterns, which may be used to synchronize the
reader. There are two types available; a block terminator
which precedes every block, and a sequence terminator
which always follows the last block.
The sequence terminator consists of two consecutive
block terminators. The terminators may be individually
enabled with the mode bits ST (sequence terminator
enable) or BT (block terminator enable).
Note: It is not possible to include a sequence terminator
in a transmission where MAXBLK = 0.
Direct Access
The direct access command allows the reading of an indi-
vidual block by sending the OP-code (’10‘), the lock-bit
and the 3-bit address.
Note: PWD has to be 0.
Modulation and Bitrate
There are two modulator stages in the e5551 (see figure 4)
whose mode can be selected using the appropriate bits in
block 0 (MS1[1:0] and MS[2:0]). Also the bitrate can be
selected using BR[2:0] in block 0. These options are
described in detail in figures 21 through 26.
Anticollision Mode
When the AOR bit is set, the IC does not start modulation
after loading configuration block 0. It waits for a valid
AOR data stream (wake-up command) from the reader
before modulation is enabled.
The wake-up command consists of the OP-code (’10‘)
folowing by a valid password. The IC will remain active
until the RF field is turned off or a stop OP-code is
received.
Table 7. e5551 – modes of operation
PWD
1
AOR
1
STOP
0
1
0
0
0
1
0
0
0
0
x
0
1
Behavior of Tag after Reset / POR
Anticollision mode:
D Modulation starts after wake-up
with a matching PWD
D Programming needs valid PWD
D AOR allows programing with read
protection (no read after write)
Password mode:
D Modulation starts after reset
D Programming needs valid PWD
D Modulation starts after wake-up
command
D Programming with modulation
defeat without previous wake-up
possible
D AOR allows programing with read
protection (no read after write)
D Modulation starts after reset
D Direct access command
D Programming without password
See corresponding modes above
STOP Function
STOP OP-code (’11‘) defeats modu-
lation until RF field is turned off
STOP OP-code ignored, modulation
continues until RF field is turned off
8 (21)
Rev. A2, 19-Apr-00
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