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參數(shù)資料
| 型號： | MCRF451 |
| 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)： | 28/50頁 |
| 文件大?。?/td> | 1172K |
| 代理商： | MCRF451 |
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MCRF450/451/452/455
DS40232H-page 28
2003 Microchip Technology Inc.
6.2.3.3
Usage Of TSMAX And TCMAX
The parameters of TSMAX and TCMAX are
determined by an expected number of tags in the
Detection Loop. The following table shows the
recommended FRR command repeat times for each of
the 7 possible combinations of TSMAX and TCMAX.
The command repeat time in Table 6-8 is calculated by:
EQUATION 6-1:
COMMAND REPEAT TIME
TABLE 6-8:
FRR COMMAND REPEAT TIME VS. (TSMAX, TCMAX)
6.2.3.4
1-of-16 PPM
The Interrogator uses 1-of-16 Pulse Position
Modulation (PPM) for MC1 and MC2 matching codes,
End Process (EP) and also commands in Table 6-2.
1-of-16 PPM uses only one gap pulse in one of
sixteen possible pulse positions for sending 4-bit
symbols (2
4
= 16). This means one symbol (one
data packet) represents 4 bits of binary data. One
symbol lasts for 2.8 ms and 160
μ
s for Normal Speed
and Fast Speed mode, respectively. All communica-
tions begin with time calibration pulses (TCP)
composed of three pulses in positions, zero, six and
fourteen of a 1-of-16 PPM symbol, as shown in
Figure 6-10.
TABLE 6-9:
1-OF-16 PPM PULSE SPECIFICATIONS
(TSMAX, TCMAX)
(1,1)
(1,2)
(1,4)
(16,1)
(16,2)
(16,4)
(64,1)
Command Repeat Time
2.925 ms
5.85 ms
11.7 ms
46.8 ms
93.6 ms
187.2 ms
187.2 ms
Command Repeat Time
TSMAX
TCMAX
2.5
ms
1.17
×
×
×
=
Where:
1.17 is related to the tolerance of the baud rate.
Normal Mode
Fast Mode
Modulation depth (MOD
INDEX
_
GAP
)
100% (max)
100% (max)
Pulse width
175
μ
s (typical)
10
μ
s (typical)
Gap width
100
μ
s (typical)
7
μ
s (typical)
Pulse positions per symbol
16
16
Symbol width
2.8 ms (typical)
160
μ
s (typical)
Calibration sequence
Pulses in positions 0, 6, 14
Pulses in positions 0, 6, 14
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