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參數(shù)資料
| 型號： | MCRF355 |
| 廠商： | Microchip Technology Inc. |
| 英文描述： | CONNECTEUR |
| 中文描述： | 13.56 MHz無源RFID器件的防沖突功能 |
| 文件頁數(shù)： | 9/23頁 |
| 文件大?。?/td> | 568K |
| 代理商： | MCRF355 |
2002 Microchip Technology Inc.
DS21287F-page 9
MCRF355/360
3.0
RESONANT CIRCUIT
The MCRF355 requires external coils and capacitor in
order to resonate at the carrier frequency of the reader.
About one-fourth of the turns of the coil should be
connected between antenna B and V
SS
; remaining
turns should be connected between antenna A and B
pads. The MCRF360 includes a 100 pF internal reso-
nant capacitor. Therefore, the device needs only exter-
nal coils for the resonant circuit. For example, the
device needs 1.377
μ
H of inductance for the carrier fre-
quency = 13.56 MHz.
Figures 3-1 (a) and (b) show possible configurations of
the external circuits for the MCRF355. In Figure 3-1 (a),
two external antenna coils (L1 and L2) in series and a
capacitor that is connected across the two inductors
form a parallel resonant circuit to pick up incoming RF
signals and also to send modulated signals to the
reader. The first coil (L1) is connected between
antenna A and B pads. The second coil (L2) is con-
nected between antenna B and V
SS
pads. The capaci-
tor is connected between antenna A and V
SS
pads.
Figure 3-1(b) shows the resonant circuit formed by two
capacitors (C1 and C2) and one inductor.
Figure 3-1(c) shows a configuration of an external
circuit for the MCRF360. By utilizing the 100 pF internal
resonant capacitor, only L1 and L2 are needed for the
external circuit.
FIGURE 3-1:
CONFIGURATION OF EXTERNAL RESONANT CIRCUITS
(a)
Interrogator
MCRF355
Ant. B
Ant. A
V
SS
C
L1 > L2
f0
2
π
CL
T
---------1
=
L1
L2
RF Carrier
Modulated
RF Data
Where:
L
T
= L
1
+ L
2
+ 2L
M
L
M
= Mutual inductance
between L
1
and L
2
Interrogator
C1
C2
MCRF355
Ant. B
Ant. A
V
SS
f
0
2
π
L
C
2
+
C
2
-----1
-------------------1
=
C1
≥
C2
(b)
RF Carrier
Modulated
RF Data
L
(c)
Interrogator
MCRF360
Ant. A
Ant. B
V
SS
L1 > L2
f
0
2
π
LT
(
)
100
x
1012
(
–
)
---------------------------1
=
L1
L2
RF Carrier
Modulated
RF Data
Where:
L
T
= L
1
+ L
2
+ 2L
M
L
M
= Mutual inductance
between L
1
and L
2
100 pF
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MCRF360 | 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:13.56 MHz Passive RFID Device with Anti-Collision Feature |
| MCRF450 | 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:13.56 MHz Read/Write Passive RFID Device |
| MCRF451 | 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:13.56 MHz Read/Write Passive RFID Device |
| MCRF452 | 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:13.56 MHz Read/Write Passive RFID Device |
| MCRF455 | 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:13.56 MHz Read/Write Passive RFID Device |
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