NXP Semiconductors MFRC522 Manuals

Manuals and User Guides for NXP Semiconductors MFRC522. We have 1 NXP Semiconductors MFRC522 manual available for free PDF download: Design Manual

NXP Semiconductors MFRC522 Design Manual (65 pages)

Brand: NXP Semiconductors | Category: Antenna | Size: 1 MB

Introduction
3
Purpose and Scope
3
Mfrc52X/Pn51X/Pn53X Features
3
How to Use this Document
4
Selection Guide
6
Fig 1. Block Diagram of the Complete RF Part
7
Antenna Topology I
7
Fig 2. Series Equivalent Circuit
8
Equivalent Circuit
8
Determination of Series Equivalent Circuit
8
Calculation of Antenna Quality Factor Damping Resistor R
8
Determination of Parallel Equivalent Circuit
8
Fig 3. Parallel Equivalent Circuit
9
Fig 4. Impedance Transformation
9
EMC Filter Design
9
Fig 5. Definition of Transformation Impedance Z
10
Fig 6. Measurement of Matching Impedance
12
Matching Circuit Design
12
Component Calculation
12
Tuning Procedure
12
Fig 7. Calculation of Matching Impedance
13
Fig 8. Smith Chart for Matching Impedance
13
Fig 9. Smith Charts for C Tuning
15
Tuning of Series Matching Capacitance C
15
Fig 10. Smith Charts for C Tuning
16
Tuning of Parallel Matching Capacitance C
16
Tuning Flow Chart
17
Receiver Circuit
18
Receiver Circuit Design
18
Initiator Mode
18
Pn51X/Pn53X Evaluation Board Antenna
19
Target Mode
19
Example
19
Fig 14. Example: Z Match Simulation
21
Fig 15. Example: Z Match Measurement
21
Fig 16. C1 Split Topology
22
Antenna Topology II
22
Component Calculation
22
Fig 17. Measurement Points for C1 Split
23
EMC and VANT
24
Fig 19. the Voltage at RX Is more Stabilized
25
Fig 20. Parallel Capacitor to C1
26
Features and Hints of Using Antenna Topology
26
Fig 21. Asymmetric Tuning of Antenna Topology I and II
27
Asymmetric Tuning of Antenna Topology I or II27
27
Fig 22. Smith Charts for C Tuning
28
Tuning of Series Matching Capacitance C
28
Fig 23. Smith Charts for C Tuning
29
Tuning of Parallel Matching Capacitance C
29
Fig 12. Fig
30
Fig 24. Block Diagram of the Complete RF Part
30
Antenna Topology III
30
Fig 25. Detuning Effects of Old Antenna Topology
32
Features and Hints of Antenna Topology III
32
Match
33
Transmitter Match
33
Test Circuit
33
Fig 28. RF Power Vs. Matching Resistance
34
Fig 29. Power Added Efficiency @ 3V
34
Fig 30
35
Fig 30. Measurement of Matching Impedance
35
Matching Circuit Design
35
Calculation of Matching Components
35
Fig 31. Simulation of Matching Impedance
37
Tuning Procedure
37
Fig 32. Smith Chart for Matching Impedance
38
Fig 33. Smith Charts for C Tuning
39
Tuning of EMC Matching Capacitance C
39
Fig 34. Smith Charts for C 1 Tuning
40
Tuning of Series Matching Capacitance C 1
40
Fig 35. Tuning Flow Chart
41
Tuning Flow Chart
41
Fig 36. Receiver Circuit
42
Receiver Circuit Design
42
Initiator Mode
42
Target Mode
43
Fig 37. Mfrc52X/Pn51X/Pn53X Evaluation Board
44
Antenna
44
Example
44
Fig 38. Z Match Simulation
45
Fig 39. Circular Antenna
46
Appendix
46
Antenna Design
46
Antenna Inductance
46
Circular Antennas
46
Fig 40. Rectangular Antenna
47
Rectangular Antennas
47
Fig 41. Ground Current Compensation
48
Number of Turns
48
Antenna Symmetry
48
Fig 42. Example Symmetric 4-Turn Antenna
49
Ferrite Shielding
49
Metal Plane
50
Fig 43. Non Disturbed Field Distribution of a Circular Antenna
50
Antenna
51
Fig 46. Pulse Width Definition
51
Antenna Quality Factor
51
Fig 47. Series Equivalent Circuit
53
Equivalent Circuit
53
Determination of Series Equivalent Circuit
53
Calculation of Antenna Quality Factor Damping Resistor R
53
Fig 48. Parallel Equivalent Circuit
54
Determination of Parallel Equivalent Circuit
54
Equivalent Circuit Measurement
55
Impedance Analyzer with Equivalent Circuit Calculation
55
Network Analyzer
55
Fig 49. Simulation Results for Characteristic Circuit
56
Series Equivalent Circuit
56
Fig 50. Series Equivalent Resistance Calculation
57
Fig 51. Setup to Check the Q-Factor
58
Pulse Shape Check
58
Pulse Shape According to ISO/IEC 18092, 106 Kbps
59
Pulse Shape According to ISO/IEC 18092
59
Bit Rate 106Kbps
59
Pulse Shape According to ISO/IEC 18092, 212 and 424 Kbps
60
Bit Rate 212 Kbps and 424 Kbps
60
References
61
Abbreviations
61
Legal Information
62
Definitions
62
Disclaimers
62
Licenses
62
Trademarks
62
Table of Contents
63
List of Figures
63
List of Tables
64
Contents
65

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NXP Semiconductors MFRC522 Design Manual (65 pages)

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