LRI64-SBN18/1GE STMicroelectronics, LRI64-SBN18/1GE Datasheet - Page 25

• Manufacturer Part Number: LRI64-SBN18/1GE
• Description: IC EEPROM MEMORY TAG WAFER
• Manufacturer: STMicroelectronics
• Series: LRI64r

Specifications of LRI64-SBN18/1GE

• Rf Type: Write Once Read Many (WORM)
• Frequency: 13.56MHz
• Features: ISO15693, ISO18000-3
• Package / Case: Wafer
• For Use With: 497-5538 - DEMO KIT LONG-RANGE
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

LRI64
15
15.1
15.2
15.3
Anticollision
The purpose of the anticollision sequence is to allow the VCD to compile a list of the LRI64
devices that are present in the VCD field, each one identified by its unique ID (UID).
The VCD is the master of the communication with one or multiple LRI64 devices. It initiates
the communication by issuing the Inventory request
Request flags
The Nb_slots_flag needs to be set appropriately. The AFI flag needs to be set, if the
Optional AFI Field is to be present.
Mask length and mask value
The mask length defines the number of significant bits in the mask value.
The mask value is contained in an integer number of bytes.
The least significant bit of each is transmitted first.
If the mask length is not a multiple of 8 (bits), the most significant end of the mask value is
padded with the required number of null bits (set to 0) so that the mask value is contained in
an integer number of bytes, so that the next field (the 2-byte CRC) starts at the next byte
boundary.
In the example of
padded out at the most significant end with five bits set to 0. The 11-bit mask plus the
current slot number is compared to the UID.
Inventory responses
Each LRI64 sends its response in a given time slot, or else remains silent.
The first slot starts immediately after the reception of the request EOF.
To switch to the next slot, the VCD sends another EOF.
The following rules and restrictions apply:
●
●
The pulse shall be generated according to the definition of the EOF in ISO 15693 and ISO
18000-3 Mode 1 standards.
if no LRI64 answer is detected, the VCD may switch to the next slot by sending an EOF
if one or more LRI64 answers are detected, the VCD waits until the complete frame has
been received before sending an EOF, to switch to the next slot.
Figure
20, the mask length is 11 bits. The mask value, 10011001111, is
(Figure
22).
Anticollision
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