參數(shù)資料
型號(hào)： MCP450SB
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(wú)源RFID器件
文件頁(yè)數(shù)： 24/50頁(yè)
文件大?。?/td> 1172K
代理商： MCP450SB
MCRF450/451/452/455
DS40232H-page 24
2003 Microchip Technology Inc.
FIGURE 6-2:
PULSE WAVEFORM OF GAP AND 1-OF-16 PPM SIGNALS
TABLE 6-7:
WAVEFORM CHARACTERISTICS OF GAP AND 1-0F-16 PPM SIGNALS
Signal
Symbol
Min
Typ
Max
Unit
Conditions
Gap signal and
1-of-16 PPM for
Normal mode
t1
145
175
205
μ
s
PW
PPM
_
N
t2
20
100
150
μ
s
Measured at 50%, See Figure 6-2
GAP
WIDTH
_
N
MOD
INDEX
_
GAP
20
60
100
%
See Figure 6-2
1-of-16 PPM for
Fast mode
t1
8.3
10
11.7
μ
s
PW
PPM
_
F
t2
6.0
7.0
8.0
μ
s
Measured at 50%, See Figure 6-2
GAP
WIDTH
_
F
MOD
INDEX
_
GAP
20
60
100
%
See Figure 6-2
100%
50%
t2
t1
0%
A
B
A
B
A
B
(a)
Example of Interrogator’s signal received at tag’s antenna coil.
See Table 6-7 for the specifications of t1, t2, and modulation depth (modulation index).
The Modulation Index is defined as:
Modulation Index
A
-------------
B
–
A
B
+
100%
×
=
(b) FRR command waveform for Figure 6-3 (A) with near 100% Modulation Index
(c) FRR command waveform for Figure 6-3 (A) with near 20% Modulation Index
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