MCRF450 Просмотр технического описания (PDF) - Microchip Technology

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MCRF450

13.56 MHz Read/Write Passive RFID Device

Microchip Technology 

MCRF450/451/452/455

TABLE 2-7: PAD FUNCTION TABLE

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.

VSS

FCLK

CLK

VDD

Note:

Connected to antenna coil L2.

Device ground during Test mode.

(VSS = substrate)

For device test only. Leave floating or

connect to VSS in applications.

For device test only. Leave floating in

applications.

NC = Not Connected.

FIGURE 2-2:

EXTERNAL CIRCUIT CONFIGURATION FOR MCRF450

(a) Two inductors and one capacitor

Ant. A

L1

C

MCRF450

VSS

L2 Ant. B

L1 > L2 Note: Substrate = VSS

ftuned

=

----------1-----------

2π LTC

fdetuned

=

----------1-----------

2π L1C

LT = Total antenna inductance between Ant. A and VSS

LT = L1 + L2 + 2LM

Where: LM = mutual inductance of L1 and L2

LM = K L1L2

K = coupling coefficient of two inductors (0 ≤ K ≤ 1)

(b) One inductor and two capacitors

Ant. A

C1

L

MCRF450

VSS

C2 Ant. B

C1 ≥ C2 Note: Substrate = VSS

ftuned

=

------------1-------------

2π LTCT

fdetuned

=

----------1-----------

2π LC1

CT

=

----C----1---C----2-----

C1 + C2

Note: Input parasitic capacitance between Antenna A and VSS pads = 3.5 pF.

See application notes, AN710 and AN830 for antenna circuit design.

 2003 Microchip Technology Inc.

DS40232H-page 9

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