M24LR64E-R Datasheet, PDF (80/140 Pages) STMicroelectronics – 64-Kbit EEPROM with password protection, dual interface & energy harvesting: 400 kHz I²C bus & ISO 15693 RF protocol at 13.56 MHz

Command codes
M24LR64E-R
26.1
Inventory
When receiving the Inventory request, the M24LR64E-R runs the anticollision sequence.
The Inventory_flag is set to 1. The meaning of flags 5 to 8 is shown in Table 29.
The request contains:
● the flags,
● the Inventory command code (see Table 36),
● the AFI if the AFI flag is set,
● the mask length,
● the mask value,
● the CRC.
The M24LR64E-R does not generate any answer in case of error.
Table 37. Inventory request format
Request
SOF
Request_flags Inventory
Optional
AFI
8 bits
01h
8 bits
Mask
length
8 bits
Mask
value
CRC16
Request
EOF
0 - 64 bits 16 bits
The response contains:
● the flags,
● the Unique ID.
Table 38. Inventory response format
Response Response_
SOF
flags
DSFID
8 bits
8 bits
UID
64 bits
CRC16
16 bits
Response
EOF
During an Inventory process, if the VCD does not receive an RF M24LR64E-R response, it
waits for 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 M24LR64E-R to transmit an SOF to the VCD,
● t_NRT is the nominal response time of the M24LR64E-R.
t_NRT and t_SOF are dependent on the M24LR64E-R-to-VCD data rate and subcarrier
modulation mode.
When configured in the RF busy mode, the RF WIP/BUSY pin is tied to 0 from the SOF
starting the inventory command to the end of the M24LR64E-R response. If the M24LR64E-
R does not receive the corresponding slot marker, the RF WIP/BUSY pin remains at 0 until
the next RF power-off.
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Doc ID 022712 Rev 3