Wavecom GR64 UART Sleep Protocols Spezifikationen Seite 103
- Seite / 141
- Inhaltsverzeichnis
- LESEZEICHEN
Bewertet. / 5. Basierend auf Kundenbewertungen
8.3. REGULATOR SELECTION
Device Voltage Ave Current Ave Power
GSM Module 3.8V 0.2% × 850mA
a
1.7mW
Microprocessor 5.0V 12mA
b
60mW
LEDs 5.0V 1mA
c
5mW
LCD display 5.0V 3mA max 15mW
d
LM35 Temp sensor 5.0V 130µA 0.65mW
TOTAL POWER 85mW
Table 8.1: Power requirements of the uplink module.
All values measured unle ss otherwise stated.
a
GSM module is usually idle. Assuming power-up time of two and a half minutes per
day.
b
PIC 18F4620 5.0V operation at 8MHz HS oscillator enabled.
c
Red High Efficiency (1mA) LEDs driven by 5.0V logic outputs through a suitable
resistor with average 50% duty cycle.
d
Worst-case scenario from device datasheet.
8.3 Regulator Selection
In order to extract the maximum useful life from the battery and prevent
overheating in the sealed enclosure, the converters should be highly efficient.
Linear regulators, when dropping from 12V to 3.8V, have a conversion efficiency
of less than 32%. Matters do not improve much at 5V with less than 42%
of consumed energy being useful. Linear regulators are thus immediately
dismissed due to their inefficiency in this application.
Switched-mode converters exhibit much higher efficiencies — over 95%
is possible with commercial, off-the-shelf buck converters
1
. The primary
drawback of these circuits is the switching noise which is produced on the
supply rails. A further concern is the typical operating frequency of 100kHz
to 200kHz. This is precisely the operating frequency of the RFID reader
and will inevitably result in interference. Many devices were considered with
mixed results. Consult Appendix D for a full list of all devices considered.
Oulined below are details of two evaluated buck switching converters.
1
e.g. Maxim’s range of switched mode DC-DC buck converters at www.maxim-ic.com.
90
- 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
Verwandte Produkte und Handbücher für Prozessoren Wavecom GR64 UART Sleep Protocols
BENDIX BW2187 Handbücher
Bedienungsanleitungen und Benutzerhandbücher für Nein BENDIX BW2187.
Wir stellen 1 PDF-Handbücher BENDIX BW2187 zum kostenlosen herunterladen nach Dokumenttypen zur Verfügung Bedienungsanleitung
Inhaltsverzeichnis
Weitere Produkte und Handbücher für Nein BENDIX
| Modelle | Dokumententyp |
|---|---|
| TCH-007-006 |
Bedienungsanleitung
BENDIX TCH-007-006 User's Manual,
3 Seiten
|
| BW1432 |
Bedienungsanleitung
BENDIX BW1432 User's Manual,
6 Seiten
|
| 03-K-3 |
Bedienungsanleitung
BENDIX 03-K-3 User's Manual,
1 Seiten
|
| TCH-001-053 |
Bedienungsanleitung
BENDIX TCH-001-053 User's Manual,
1 Seiten
|
| 05-A-09 |
Bedienungsanleitung
BENDIX 05-A-09 User's Manual,
1 Seiten
|
| BW2775 |
Bedienungsanleitung
BENDIX BW2775 User's Manual [en] ,
1 Seiten
|
| PNU-121 |
Bedienungsanleitung
BENDIX PNU-121 User's Manual [it] ,
8 Seiten
|
| PNU-103 |
Bedienungsanleitung
BENDIX PNU-103 User's Manual,
1 Seiten
|
| BW7508 |
Bedienungsanleitung
BENDIX BW7508 User's Manual,
1 Seiten
|
| PNU-161 |
Bedienungsanleitung
BENDIX PNU-161 User's Manual,
2 Seiten
|
| BW2787 |
Bedienungsanleitung
BENDIX BW2787 User's Manual [en] ,
1 Seiten
|
| 11-B-01 |
Bedienungsanleitung
BENDIX 11-B-01 User's Manual,
2 Seiten
|
| TCH-003-014 |
Bedienungsanleitung
BENDIX TCH-003-014 User's Manual [ja] [zh] ,
4 Seiten
|
| BW1715 |
Bedienungsanleitung
BENDIX BW1715 User's Manual,
1 Seiten
|
| TCH-008-011 |
Bedienungsanleitung
BENDIX TCH-008-011 User's Manual,
2 Seiten
|
| TCH-013-002 |
Bedienungsanleitung
BENDIX TCH-013-002 User's Manual,
1 Seiten
|
| TCH-001-023 |
Bedienungsanleitung
BENDIX TCH-001-023 User's Manual,
1 Seiten
|
| BW1575 |
Bedienungsanleitung
BENDIX BW1575 User's Manual,
4 Seiten
|
| BW7541S |
Bedienungsanleitung
BENDIX BW7541S User's Manual,
2 Seiten
|
| PNU-127 |
Bedienungsanleitung
BENDIX PNU-127 User's Manual,
1 Seiten
|
© 2020, manymanuals.de. Alle Rechte vorbehalten. | 0.030 s |
Manymanuals.com
Manymanuals.de
Manymanuals.fr
Manymanuals.it
Manymanuals.pl
Manymanuals.cz
Manymanuals.es
Manymanuals-pt.com
Kommentare zu diesen Handbüchern