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MCRF451 Folha de dados(PDF) 10 Page - Microchip Technology

Nome de Peças MCRF451
Descrição Electrónicos  13.56 MHz Read/Write Passive RFID Device
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Fabricante Electrônico  MICROCHIP [Microchip Technology]
Página de início  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

MCRF451 Folha de dados(HTML) 10 Page - Microchip Technology

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MCRF450/451/452/455
DS40232H-page 10
 2003 Microchip Technology Inc.
FIGURE 2-3:
EXTERNAL CIRCUIT CONFIGURATION FOR MCRF451
FIGURE 2-4:
EXTERNAL CIRCUIT CONFIGURATION FOR MCRF452
FIGURE 2-5:
EXTERNAL CIRCUIT CONFIGURATION FOR MCRF455
Note: Substrate = V
SS
Internal Resonant Capacitor (Cres_100) = 95 pF
L1:
External Antenna Coil A
L2:
External Antenna Coil B
Ant. A
Ant. B
L1
V
SS
L2
MCRF451
Int. Res. Cap.
L1 > L2
ftuned
1
LT
()95
12
×10
------------------------------------------------
=
fdetuned
1
L1
()95
12
×10
-----------------------------------------------
=
LT = Total antenna inductance between Ant. A and VSS
= 95 pF
Ant. A
Ant. B
L
V
SS
MCRF452
Internal Resonant Capacitor between Ant. A and V
SS pads:
C
RES_2_50 + parasitic capacitor = 30 pF
Note:
Substrate = V
SS
ftuned
1
L
()30
12
×10
-------------------------------------------
=
fdetuned
1
L
()50.6
12
×10
------------------------------------------------
=
Int. Res. Cap.
= 30 pF
50.6 pF
65.4 pF
Internal Resonant Capacitor (Cres_50) = 50 pF
L1: External Antenna Coil A
L2: External Antenna Coil B
Ant. A
Ant. B
L1
V
SS
L2
MCRF455
ftuned
1
LT
()50
12
×10
------------------------------------------------
=
fdetuned
1
L1
()50
12
×10
-----------------------------------------------
=
LT = Total antenna inductance between Ant. A and VSS
Note:
Substrate = V
SS
L1 > L2
Int. Res. Cap.
= 50 pF
Note:
See application notes AN710 and AN830 for antenna circuit design of
Figure 2-2 through Figure 2-5.


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