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LEON-G100/G200 - System Integration Manual
GSM.G1-HW-09002-C Preliminary System description
Page 20 of 75
Figure 6: Description of the VCC current consumption profile versus time during a GSM call
When a GPRS connection is established, the battery is discharged at a rate determined by the current
consumption profile typical of the GPRS transmitting and receiving bursts. In contrast to a GSM call, during a
GPRS connection more than one slot can be used to transmit and/or more than one slot can be used to receive.
The transmitted power depends on network conditions and sets the peak of current consumption, but following
the GPRS specifications the maximum transmitted power can be reduced if more than one slot is used to
transmit, so the maximum peak of current consumption is not as high as can be the case in a GSM call.
1.5.2.1.2 Idle-mode
By default the module automatically enters idle-mode (power-saving mode) whenever possible, unless idle mode
is disabled using the appropriate AT command (refer to u-blox AT Commands Manual [2]).
When the data module is registered or attached to a network and a voice or data call is not enabled, the module
must periodically monitor the paging channel of the current base station (paging block reception), in accordance
to GSM system requirements. When the module monitors the paging channel, it wakes up to active mode, to
enable the paging block reception. In between, the module switches to idle-mode (power-saving mode). This is
known as GSM discontinuous reception (DRX).
The module processor core is activated during the paging block reception, and automatically switches its
reference clock frequency from the 32 kHz to the 26 MHz used in active-mode.
The time period between two paging block receptions is defined by the network. The time interval between two
paging block receptions can be from 470.76 ms (width of 2 GSM multiframes = 2 x 51 GSM frames = 2 x 51 x
4.615 ms) up to 2118.42 ms (width of 9 GSM multiframes = 9 x 51 frames = 9 x 51 x 4.615 ms): this is the
paging period parameter broadcast and fixed by the base station.
An example of current consumption profile of the data module is shown in Figure 7: the module is registered
with the network, automatically goes into idle mode and periodically wakes up to active mode to monitor the
paging channel for paging block reception
Time
RX
slot
unused
slot
unused
slot
TX
slot
unused
slot
unused
slot
MON
slot
unused
slot
RX
slot
unused
slot
unused
slot
TX
slot
unused
slot
unused
slot
MON
slot
unused
slot
GSM frame
4.615 ms
(1 frame = 8 slots)
Current
200 mA
~40 mA
~170 mA
2500 mA
Depends on
TX power
~170 mA
GSM frame
4.615 ms
(1 frame = 8 slots)
Time
RX
slot
unused
slot
unused
slot
TX
slot
unused
slot
unused
slot
MON
slot
unused
slot
RX
slot
unused
slot
unused
slot
TX
slot
unused
slot
unused
slot
MON
slot
unused
slot
GSM frame
4.615 ms
(1 frame = 8 slots)
Current
200 mA
~40 mA
~170 mA
2500 mA
Depends on
TX power
~170 mA
GSM frame
4.615 ms
(1 frame = 8 slots)
- LEON-G100/G200 1
- Page 2 2
- Preface 3
- Page 4 of 75 4
- Contents 5
- Page 6 of 75 6
- Page 7 of 75 7
- 1 System description 8
- 1.2 Architecture 9
- 1.2.1 Functional blocks 10
- Page 11 of 75 11
- 1.3 Pin-out 12
- 1.4 Operating Modes 14
- 1.5.2 Voltage supply (VCC) 17
- 500 mAh … 1100 mAh 22
- Page 23 of 75 23
- Page 25 of 75 25
- 1.6 System functions 26
- Page 27 of 75 27
- 1.6.2 Module power off 28
- 1.6.3 Module reset 29
- 1.7 RF connection 31
- 1.8 Antenna supervisor 31
- 1.9 Audio 31
- Page 32 of 75 32
- Page 34 of 75 34
- Page 38 of 75 38
- Page 40 of 75 40
- 1.10 SIM interface 41
- 1.11 Serial Communication 42
- Page 43 of 75 43
- Page 44 of 75 44
- Page 45 of 75 45
- Page 46 of 75 46
- 1.11.2 DDC (I 47
- C) interface 47
- Page 48 of 75 48
- Page 49 of 75 49
- 1.14 Approvals 50
- 2 Design-In 51
- Pinout_Layout_R1.1(ppt) 52
- Page 54 of 75 54
- Page 55 of 75 55
- Page 56 of 75 56
- Page 57 of 75 57
- Page 58 of 75 58
- 2.4 Antenna guidelines 60
- 2.4.1 Antenna termination 61
- 2.4.2 Antenna radiation 62
- LEON-G100 64
- LEON-G200 64
- 3 Handling and soldering 65
- 3.2.3 Optical inspection 66
- 3.2.4 Cleaning 66
- Page 67 of 75 67
- 4 Product Testing 68
- Appendix 69
- A Extra Features 69
- A.5 HTTP 70
- A.6 SMTP 70
- A.7 FOTA (LEON-G200 only) 70
- A.8 GPS 70
- B Glossary 71
- Page 72 of 75 72
- Related documents 73
- Revision history 74
- Contact 75
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