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MCRF455 датащи(PDF) 9 Page - Microchip Technology

номер детали MCRF455
подробное описание детали  13.56 MHz Read/Write Passive RFID Device
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производитель  MICROCHIP [Microchip Technology]
домашняя страница  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

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 2003 Microchip Technology Inc.
DS40232H-page 9
MCRF450/451/452/455
TABLE 2-7:
PAD FUNCTION TABLE
FIGURE 2-2:
EXTERNAL CIRCUIT CONFIGURATION FOR MCRF450
Name
Function
Ant. Pad A Connected to antenna coil L1.
Ant. Pad B Connected to antenna coils L1 and L2
for MCRF450/451/455, NC for
MCRF452.
V
SS
Connected to antenna coil L2.
Device ground during Test mode.
(V
SS = substrate)
F
CLK
For device test only. Leave floating or
connect to V
SS in applications.
CLK
V
DD
For device test only. Leave floating in
applications.
Note:
NC = Not Connected.
Ant. A
Ant. B
L1
V
SS
L2
C
MCRF450
Note: Substrate = V
SS
L1 > L2
(a) Two inductors and one capacitor
ftuned
1
2π LTC
----------------------
=
fdetuned
1
2π L1C
----------------------
=
LT L1 L2 2LM
++
=
Where: LM = mutual inductance of L1 and L2
LT = Total antenna inductance between Ant. A and VSS
LM KL1L2
=
K = coupling coefficient of two inductors (0
≤ K ≤ 1)
Ant. A
Ant. B
L
V
SS
C1
MCRF450
Note: Substrate = V
SS
C1
≥ C2
(b) One inductor and two capacitors
ftuned
1
2π LTCT
--------------------------
=
fdetuned
1
2π LC1
----------------------
=
CT
C1C2
C1 C2
+
--------------------
=
C2
Note:
Input parasitic capacitance between Antenna A and V
SS pads = 3.5 pF.
See application notes, AN710 and AN830 for antenna circuit design.


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