參數(shù)資料
型號(hào)： LRI512
廠商： 意法半導(dǎo)體
英文描述： Memory TAG IC 512 bit High Endurance EEPROM 13.56MHz, ISO 15693 Standard Compliant with E.A.S.
中文描述： 內(nèi)存標(biāo)簽集成電路的512位高耐力的EEPROM 13.56，ISO 15693標(biāo)準(zhǔn)符合標(biāo)準(zhǔn)的防盜
文件頁(yè)數(shù)： 3/54頁(yè)
文件大?。?/td> 351K
代理商： LRI512
3/54
LRI512
Commands
The LRI512 supports the following commands:
–
INVENTORY
: used to perform the anti-collision
sequence.
–
STAY QUIET:
to put the LRI512 in quiet mode.
The LRI512 is then deselected and does not re-
spond to any command.
–
SELECT:
used to select the LRI512. After this
command, the LRI512 processes all READ/
WRITE commands with the Select_Flag set.
–
RESET TO READY:
to put the LRI512 in the
ready state.
–
READ BLOCK:
to output the 32 bits of the se-
lected block and its locking status.
–
WRITE BLOCK:
to write the 32-bit value in the
selected block, provided that it is not locked.
–
LOCK BLOCK:
to lock the selected block. After
this command, the block cannot be modified.
–
WRITE AFI:
to write the 8-bit value in the AFI
register, provided that it is not locked.
–
LOCK AFI:
to lock the AFI register.
–
ACTIVATE EAS:
to set the non volatile EAS bit.
When the EAS bit is set, the LRI512 answers to
the POOL EAS command.
–
DEACTIVATE EAS:
to reset the non volatile
EAS bit, so that the LRI512 no longer answers
to the POOL EAS command.
–
POOL EAS
: used to request all LRI512s in the
Reader field to generate the EAS signal, provid-
ed that their EAS bit is set.
Initial Dialogue for Vicinity Cards
The dialogue between the Vicinity Coupling De-
vice (VCD) and the Vicinity Integrated Circuit Card
(LRI512) is conducted through the following con-
secutive operations:
– activation of the LRI512 by the RF operating
field of the VCD.
– transmission of a command by the VCD.
– transmission of a response by the LRI512.
These operations use the RF power transfer and
communication signal interface specified in the fol-
lowing paragraphs. This technique is called Read-
er Talk First (RTF).
Power Transfer
Power transfer to the LRI512 is accomplished by
radio frequency at 13.56 MHz via coupling anten-
nas in the LRI512 and in the VCD. The RF operat-
ing field of the VCD is transformed on the LRI512
antenna as an AC voltage which is re-dressed, fil-
tered and internally regulated. The amplitude
modulation (ASK) on this received signal is de-
modulated by the ASK demodulator.
Frequency
The ISO15693 standard defines the carrier fre-
quency (
f
c
) of the operating field to be
13.56 MHz ± 7 kHz.
Operating Field
The LRI512 operates continuously between H
min
and H
max
.
– The minimum operating field is H
min
and has a
value of 150 mA/m rms.
– The maximum operating field is H
max
and has a
value of 5 A/m rms.
A VCD shall generate a field of at least H
min
and
not exceeding H
max
in the operating volume.
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