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LEON-G100/G200 - System Integration Manual
GSM.G1-HW-09002-C Preliminary System description
Page 18 of 75
Figure 4: Description of the VCC voltage profile versus time during a GSM call
To reduce voltage drops, use a low impedance power source. The resistance of the power supply lines
(connected to VCC and GND pins of the module) on the application board and battery pack should also be
considered and minimized: cabling and routing must be as short as possible in order to minimize power losses.
To avoid undershoot and overshoot on voltage drops at the start and at the end of a transmit burst during a
GSM call (when current consumption on the VCC supply can rise up to 2.5 A in the worst case), place a 330 µF
low ESR capacitor (e.g. KEMET T520D337M006ATE045) located near the VCC pin of LEON-G100/G200 board.
To reduce voltage ripple and noise, place near the VCC pin of the LEON-G100/G200 board the following:
100 nF capacitor (e.g Murata GRM155R61A104K) and a 10 nF capacitor (e.g. Murata
GRM155R71C103K) to filter digital logic noises from clocks and data sources
10 pF capacitor (e.g. Murata GRM1555C1E100J) to filter transmission EMI in the DCS/PCS bands,
39 pF capacitor (e.g. Murata GRM1555C1E390J) to filter transmission EMI in the GSM/EGSM bands.
Any degradation in the power supply performance, due to losses, noise or transients, will directly affect the
RF performance of the module since the single external DC power source indirectly supplies all the digital
and analog interfaces, and also directly supplies the RF power amplifier (PA).
If the module is supplied by a battery, do not connect any other power supply at the VCC supply pin in parallel
to the battery.
If the module is not supplied by a battery, Figure 5 and the components listed in Table 3 show an example of a
power supply circuit. This example is implemented on the Evaluation Board EVK-G25P. VCC supply is provided by
a step-down switching regulator with a 1 MHz switching frequency.
Figure 5: Suggested schematic design for the VCC voltage supply application circuit using a step-down regulator
LEON-G100/G200
50
VCC
LEON-G100/G200
50
VCC
Time
undershoot
overshoot
ripple
ripple
drop
Voltage
3.8 V
(typ)
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)
GSM frame
4.615 ms
(1 frame = 8 slots)
Time
undershoot
overshoot
ripple
ripple
drop
Voltage
3.8 V
(typ)
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)
GSM frame
4.615 ms
(1 frame = 8 slots)
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)
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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