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Rev 1 Dec.10 Proprietary and Confidential - Specifications subject to change 69
5.3.3 Application notes
Caution: This section is under review and subject to change.
5.3.3.1 Reset sequence
To reset the modem (force the baseband circuit to reset):
1. Host drives signal low for 10–30 ms.
Note: Driving the signal low for a longer period will not damage the module, but will delay
the reset process—the baseband circuit needs the line to be high at the end of the reset
stage.
5.3.3.2 General notes
• This reset line should not be driven unless the host needs to enforce a
baseband reset by asserting a logic low.
• An open collector or open drain transistor can be used. If an open collector is
chosen, T1 can be a ROHM DTC144EE.
SYSTEM_RESET_N
time (Rt)
c
at power up
only
20 40 100 ms
Cancellation time (Ct) 34 ms
V
H
d
0.57 V
V
IL
0 0.57 V
V
IH
1.33 V
a. Internal pull-up
b. This reset time is the minimum to be carried out on the SYSTEM_RESET_N signal when
the power supply is already stabilized.
c. This reset time is internally carried out by the embedded module power supply supervisor
only when the embedded module power supplies are powered ON.
d. VH: Hysterisis voltage
Table 5-7: Reset settings
Reset command SYSTEM_RESET_N
(Pin 63)
Operating mode
1 0 Reset activated
0 1 Reset inactive
Table 5-6: Reset signal electrical characteristics
Parameter Minimum Typical Maximum Unit
- 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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