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Appendix D

Appendix: Power Supply

The devices shown in table D.1 were all considered for use in the system’s

power supply, however, due to a lack of local availability, high cost or unsuitable

operating frequency, they were dismissed in favour of the L4976 from ST

Microelectronics.

D-1

1 2 ... 132 133 134 135 136 137 138 139 140 141

Low Cost 1
Penguin RFID Reader 1
Abstract 2
Acknowledgements 3
Declaration 4
Contents 5
List of Figures 9
List of Tables 11
Glossary 12
Chapter 1 15
Introduction 15
1.3 Project Timeframe 16
1.5 Project Challenges 18
1.6 Report Structure 20
Chapter 2 21
Analysis of Existing Solution 21
2.2 Power Supply 23
2.4 Data Delivery 25
Chapter 3 26
Device Speciﬁcation 26
Chapter 4 29
Overview of Proposed Solution 29
4.3 Uplink Module 31
4.4 Interconnections 32
4.5 Power Supply 32
Chapter 5 33
RFID Reader Design 33
5.1.3 Operating Frequency 37
5.3.1 64 Data Bits 42
5.3.2 CRC Veriﬁcation 42
5.4 Hardware 43
5.4. HARDWARE 49
5.4.5 Processor 53
5.4.6 Interface 56
5.4.7 PCB Layout 56
5.5 Software 57
5.5.2 Capture Stage 58
5.5. SOFTWARE 60
5.5.3 Decode Stage 61
5.6 Design Evaluation 63
5.6.4 Power Consumption 67
Avnett Kopp, September 2006 69
ZAR9.50 to 1 Euro 69
Chapter 6 70
RFID Co-ordinator 70
6.2 Software 71
6.2.1 Timers 72
6.2.2 RFID Reader Request FSM 72
6.3 Evaluation 75
Chapter 7 76
Uplink Design 76
7.3 Hardware Design 80
7.3.2 Processor 83
7.3.3 User Interface 84
7.3.4 Power Supply 85
7.4 Software De sign 88
Except for the I 89
Details in Section 7.4.5 89
7.4.2 Real Time Clock 90
7.4.3 User interface 90
7.4.4 Peripheral Poll FSM 91
7.4.6 Timer FSM 93
7.4.7 GSM FSM 94
7.4.8 Report Generation FSM 97
7.5 Reliability 98
7.5.1 Software 99
7.5.2 Hardware 100
Chapter 8 102
Power Supply 102
8.3 Regulator Selection 103
8.4.1 Hardware 107
40% of 7.5Ah 110
8.4.2 Software 111
8.5 Measurements 113
8.6 Conclusion 114
Chapter 9 115
Enclosure Selection and 115
Mounting Methods 115
9.2 Recommendations 116
Chapter 10 118
South African Regulations 118
10.1 GSM Module 119
10.2 RFID Readers 119
Chapter 11 120
Conclusion and System 120
Evaluation 120
Appendix A 122
Appendix: RFID Receiver 122
DUAL-CHANNEL RECEIVER 123
Appendix B 127
Appendix: RFID Co-ordinator 127
B.2. PCB LAYOUT 128
Appendix C 130
Appendix: Uplink Module 130
C.2 List of Uplink Commands 131
C.3 PCB Design 131
C.3. PCB DESIGN 133
Appendix D 137
Appendix: Power Supply 137
Appendix E 139
Appendix: Software 139
References 140

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