Sierra Wireless UMTS Spezifikationen Seite 97
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8.7 Routing constraints
8.7.1 Power supply
Since the maximum peak current can reach 2 A, Sierra Wireless strongly
recommends having a large width for the layout of the power supply signal (to
avoid voltage loss between the external power supply and the AirPrime SL808X
Embedded Module supply).
Pins 42 and 44 of the AirPrime SL808X Embedded Module should be gathered in
the same piece of copper, as shown in the figure below.
Figure 8-2: Power supply routing example
Filtering capacitors near the AirPrime SL808X Embedded Module power supply
are also recommended (22 µF to 100 µF).
Attention should be paid to the ground track or the ground plane on the
application board for the power supply which supplies the AirPrime SL808X
Embedded Module. The ground track or the ground plane on the application
board must support current peaks as well as with the VCC_3V6 track.
If the ground track between the AirPrime SL808X Embedded Module and the
power supply is a copper plane, it must not be parceled out.
The routing must be done in such a way that the total line impedance could be
10m @ 217Hz. This impedance must include the bias impedances.
The same care should be taken when routing the ground supply.
If these design rules are not followed, phase error (peak) and power loss could
occur.
8.7.1.1 Ground plane and shielding connection
The AirPrime SL808X Embedded Module has LGA ground pads linked to the
ground. The ground has to be connected to the application board through a
complete layer on the PCB.
Pin 44
Pin 42
- AirPrime SL808X 1
- AM to 5:00 PM Pacific Time 4
- Contents 5
- List of Figures 11
- List of Tables 13
- 1. Introduction 15
- C to +65C 18
- 1.2 Support features 19
- 1.3 Support tools 19
- 1.4 Accessories 20
- 1.6 Ordering information 20
- 1.7 Environmental issues 20
- 2: Functional Specifications 23
- 3: Technical Specifications 25
- 3.1.2 Power input (VCC_3V6) 26
- 3.1.3 Start-up current 26
- 3.2 Ground connection 27
- 3.4 Mechanical specifications 27
- 2.4 (nominal) 28
- 3.5 Labeling 29
- 3.6 Embedded SIM (eSIM) 29
- 3.7 Thermal considerations 30
- 3.9 Firmware upgrade 30
- 4: Interfaces 31
- Primary Antenna 32
- SL808x Block Schematic 32
- 4.1.1 Pin configuration 33
- 4.1.2 Pin description 34
- 4.3 Reference schematic 40
- 4.5 Main serial link (UART1) 41
- 4.6 SIM interface 42
- 4.6.1 SIM pin descriptions 43
- 4.6.2 Application notes 43
- 4.7 USB 2.0 interface 44
- 4.7.1 USB pin descriptions 45
- 4.7.3 Application notes 45
- 4.7.5 USB Suspend mode 46
- 4.7.6 USB Resume mode 46
- 4.8 RF interface 47
- 4.8.2 RF pin descriptions 48
- 4.8.3 RF performance 48
- • Connectorized 49
- • Nominal condi 49
- 4.8.4 Antenna specifications 50
- 4.9 Audio interfaces 51
- 4.10 Analog audio interface 52
- 4.10.2.1 MIC microphone input 53
- AirPrime SL module 54
- 4.10.3 Speaker features 57
- 4.10.3.2 SPK speaker output 58
- 4.11.1 PCM pin descriptions 62
- 4.11.2 PCM waveforms 63
- 4.12 JTAG interface 64
- 5: Signals and Indicators 65
- 5.2.1 Pin descriptions 66
- 5.2.3 Application notes 66
- 5.3.1 Pin descriptions 68
- 5.3.3 Application notes 69
- 5.4 Wake signal (WAKE_N) 70
- 5.5.1 Pin descriptions 71
- 5.5.3 Application notes 71
- 5.6 Buzzer output (BUZZER_EN) 72
- 5.7 Flash LED (LED_FLASH) 73
- 5.8 Power rail (VREF_1V8) 74
- 5.9 Reserved 75
- 6: Power Consumption 77
- 100—200 mA less 78
- 6.1 Power states 79
- 6.1.1 Power state transitions 80
- 7.1 UMTS WCDMA FDD 83
- 7.2 Supported specifications 85
- • Asynchronous 9,600 bps 88
- • Asynchronous 14,400 bps 88
- (Continued) 92
- Item GSM UMTS 92
- 8: Design Guidelines 95
- 8.4 Antenna 96
- 8.7 Routing constraints 97
- 8.7.2 SIM interface 98
- 8.7.3 Audio circuit 98
- 8.7.4 RF circuit 98
- Figure 8-4: Routing examples 99
- 8.9 Mechanical integration 101
- 8.10 Operating system upgrade 101
- 9: Embedded Testability 103
- 9.5 Serial link access 104
- 9.6 RF output accessibility 105
- 10.2 Certification compliance 107
- 10.3.1 Important notice 108
- 10.3.2 Safety and hazards 108
- North American users 109
- 11: Customization 111
- 12: Safety Recommendations 113
- 12.2 General safety 114
- 12.2.5 Aircraft 115
- 12.2.6 Children 115
- 12.2.7 Blasting areas 115
- References 117
- 14: References 119
- 14.3 Abbreviations/acronyms 120
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