LRIS64K Datasheet, PDF (85/100 Pages) STMicroelectronics – 64 Kbit EEPROM tag IC at 13.56 MHz with 64-bit UID and password based on ISO/IEC 15693 and ISO/IEC 18000-3 Mode 1

LRIS64K
Commands codes
24.18
Fast Inventory Initiated
Before receiving the Fast Inventory Initiated command, the LRIS64K must have received an
Initiate or a Fast Initiate command in order to set the Initiate_ flag. If not, the LRIS64K does
not answer to the Fast Inventory Initiated command.
On receiving the Fast Inventory Initiated request, the LRIS64K runs the anticollision
sequence. The Inventory_flag must be set to 1. The meaning of flags 5 to 8 is shown in
Table 20: Request flags 5 to 8 when Bit 3 = 1. The data rate of the response is multiplied by
2.
The request contains:
● the flags,
● the Inventory command code
● the AFI if the AFI flag is set
● the mask length
● the mask value
● the CRC
The LRIS64K does not generate any answer in case of error.
Table 81. Fast Inventory Initiated request format
Request
SOF
Request
_flags
Fast
Inventory
Initiated
IC Mfg
code
Optional
AFI⁽¹⁾
Mask
length
Mask value
8 bits C1h 02h 8 bits 8 bits
0 - 64 bits
1. Gray means that the field is optional.
CRC16
Request
EOF
16 bits
The Response contains:
● the flags
● the Unique ID
Table 82. Fast Inventory Initiated response format
Response
SOF
Response
_flags
DSFID
UID
8 bits 8 bits
64 bits
CRC16
16 bits
Response
EOF
During an Inventory process, if the VCD does not receive an RF LRIS64K response, it waits
a time t₃ before sending an EOF to switch to the next slot. t₃ starts from the rising edge of
the request EOF sent by the VCD.
● If the VCD sends a 100% modulated EOF, the minimum value of t₃ is:
t₃min = 4384/f_C (323.3µs) + t_SOF
● If the VCD sends a 10% modulated EOF, the minimum value of t₃ is:
t₃min = 4384/f_C (323.3µs) + t_NRT
where:
● t_SOF is the time required by the LRIS64K to transmit an SOF to the VCD
● t_NRT is the nominal response time of the LRIS64K
Doc ID 15336 Rev 11
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