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LRI1K bảng dữ liệu(PDF) 48 Page - STMicroelectronics

tên linh kiện LRI1K
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nhà sản xuất  STMICROELECTRONICS [STMicroelectronics]
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LRI1K bảng dữ liệu(HTML) 48 Page - STMicroelectronics

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Commands codes
LRI1K
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Doc ID 17170 Rev 3
20.1
Inventory
When receiving the Inventory request, the LRI1K runs the anticollision sequence. The
Inventory_flag is set to 1. The meaning of flags 5 to 8 is shown in Table 13: Request flags 5
to 8 when bit 3 = 1.
The request contains:
●
the flags,
●
the Inventory command code (see Table 20: Command codes)
●
the AFI if the AFI flag is set
●
the mask length
●
the mask value
●
the CRC
The LRI1K does not generate any answer in case of error.
The response contains:
●
the flags
●
the Unique ID
During an Inventory process, if the VCD does not receive an RF LRI1K 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/fC (323.3µs) + tSOF
●
If the VCD sends a 10% modulated EOF, the minimum value of t3 is:
t3min = 4384/fC (323.3µs) + tNRT
where:
●
tSOF is the time required by the LRI1K to transmit an SOF to the VCD
●
tNRT is the nominal response time of the LRI1K
tNRT and tSOF are dependent on the LRI1K-to-VCD data rate and subcarrier modulation
mode.
Table 21.
Inventory request format
Request
SOF
Request
flags
Inventory
Optional
AFI
Mask
length
Mask value
CRC16
Request
EOF
8 bits
01h
8 bits
8 bits
0 - 64 bits
16 bits
Table 22.
Inventory response format
Response
SOF
Response
flags
DSFID
UID
CRC16
Response
EOF
8 bits
8 bits
64 bits
16 bits



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