參數(shù)資料
型號： MCP450W
廠商： Microchip Technology Inc.
英文描述： 13.56 MHz Read/Write Passive RFID Device
中文描述： 13.56 MHz讀/寫無源RFID器件
文件頁數(shù)： 17/50頁
文件大?。?/td> 1172K
代理商： MCP450W
2003 Microchip Technology Inc.
DS40232H-page 17
MCRF450/451/452/455
The TSMAX and TCMAX values are determined by the
Interrogator’s decision on how many tags are in the
field. The Interrogator may assign TSMAX = 1 and
TCMAX = 1, assuming there is only one tag in the field.
The efficiency of the detection will increase in multiple
tag environments by assigning a higher number to both
the TSMAX and TCMAX. If the device receives the
FRR, it clears the Position 1 flag, waits for its time slot,
replies with the FR response and then listens for 1 ms.
The FR response consists of a maximum of 160
Manchester data bits (default: 96 bits), which includes
the 32-bit Tag ID and the FRF data (Blocks 3-5) (see
Table 6-3 and Example 9-1).
To acknowledge the FR response, the Interrogator can
start to send a matching code (MC) during the device’s
1 ms listening window (T
LW
). The MC is encoded with
1-of-16 PPM signal (see Figure 6-9). The MC1 is given
to the device if the device does not need any further
processing. If the device receives the MC1, it enters the
sleeping loop and stays in the loop in a nonmodulating
condition. The MC2 command is given to the device if
further processing (read/write) is required. If the device
receives the MC2 command, it enters the processing
loop.
If the device misses the MC within the listening window,
it sends the FR response again after its time slot when
two conditions are met: (1) Position 1 flag is cleared
and, (2) TCMAX has not elapsed. The device checks
the condition (elapsed or not elapsed) of TCMAX using
an internal transmission counter (TC). The TC consists
of 3 bits. If the Position 1 flag is cleared, the device
increments the TC by 1 each time it does not receive a
MC during its listening window. See Figure 6-1 for a
flow chart showing the conditional incrementing of the
transmission counter. Table 6-1 shows an example of
detecting the elapsed TCMAX using a rolling modulo-8
transmission counter.
For the TTF case, the device repeats its FR response
(as long as it is energized) according to the TCMAX
and TSMAX parameters, as specified in Table 7-5.
Even though the device is operating in the TTF mode,
it will respond to its correct MC during its listening
window. If TCMAX = 1, 2 or 4, it will also respond to
FRR commands, just as in the ITF case (see
Section 6.1.1.1 “Matching Code Queuing”
).
6.1.1.1
Matching Code Queuing
Once the device receives the FRR command, it sends
the FR response and waits for a matching code (MC)
during its listening window. If the device does not
receive its correct MC code before its TCMAX has
elapsed (see Table 6-1), it goes back to the beginning
of the detection loop (position 1 in the loop) and waits
for either a new FRR command or for the MC1 or MC2
matching code. This is called “matching code queuing”.
In this queuing, the device stays in the detection loop
waiting for an Interrogator command (FRR or MC). This
queuing takes place within the detection loop and is
controlled by the conditions of "Set Position 1 Flag" and
TCMAX.
This queuing allows the Interrogator to communicate
with a device outside its listening window. The result is
enhanced and accelerated processing of individual
devices in a multiple tag environment.
TABLE 6-1:
CONDITIONS FOR
TCMAX = ELAPSED FOR ITF
MODE
6.1.2
PROCESSING LOOP
The reading and writing processes take place in this
loop. Devices in this loop are waiting for commands for
processing. In order to read from, or write to, the
device, its “Processing Flag” (PF) must be set. Any
device entering this loop with its PF cleared is called a
“follow-along” tag. This follow-along tag in the loop is
not processed for reading or writing.
If the device with the PF flag set receives the EP
command, it exits this loop and enters the sleeping
loop. However, the same EP command sends the
follow-along tag back to the detection loop.
If the device receives the FRR or FRB command in this
loop, it sees the command as invalid, resets itself and
goes back to the initial power-up state.
6.1.3
SLEEPING LOOP
The sleeping loop is used to keep all processed
devices in a “silent” condition. The devices stay in this
loop in a nonmodulating condition as long as they
remain in the field.
Rolling
Modulo -8 TC
TCMAX
= 1
TCMAX
= 2
TCMAX
= 4
0
0
1
elapsed
—
—
0
1
0
elapsed
elapsed
—
0
1
1
elapsed
—
—
1
0
0
elapsed
elapsed
elapsed
1
0
1
elapsed
—
—
1
1
0
elapsed
elapsed
—
1
1
1
elapsed
—
elapsed
0
0
0
elapsed
elapsed
—
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