Integration Guide
Table Of Contents
- Preface
- Contents
- 1 System description
- 1.1 Overview
- 1.2 Architecture
- 1.3 Pin-out
- 1.4 Operating modes
- 1.5 Power management
- 1.6 System functions
- 1.7 RF connection
- 1.8 SIM interface
- 1.9 Serial Communication
- 1.10 Audio
- 1.11 ADC input (LEON-G100 only)
- 1.12 General Purpose Input/Output (GPIO)
- 1.13 M2M Setup Schematic Example
- 1.14 Approvals
- 2 Design-In
- 3 Handling and soldering
- 4 Product Testing
- Appendix
- A Extra Features
- B Glossary
- Related documents
- Revision history
- Contact
LEON-G100/G200 - System Integration Manual
GSM.G1-HW-09002-F3 Preliminary System description
Page 15 of 101
1.5.2 Module supply (VCC)
LEON-G100/G200 modules must be supplied through VCC pin by a DC power supply. Voltages must be stable,
due to the surging consumption profile of the GSM system (described in the section 1.5.3).
Name
Description
Remarks
VCC
Module Supply
Clean and stable supply is required: low ripple and low
voltage drop must be guaranteed.
Voltage provided has to be always above the minimum limit
of the operating range.
Consider that there are large current spike in connected
mode, when a GSM call is enabled.
GND
Ground
GND pins are internally connected but good (low impedance)
external ground can improve RF performances: all GND pins
must be externally connected to ground.
Table 3: Module supply pins
VCC pin ESD rating is 1 kV (contact discharge). A higher protection level could be required if the line is
externally accessible on the application board. A higher protection level can be achieved mounting an
ESD protection (e.g. EPCOS CA05P4S14THSG varistor array) on the line connected to this pin if it is
externally accessible on the application board.
The voltage provided to VCC pin must be within the normal operating range limits specified in the
LEON-G100/G200 Data Sheet [1]. Complete functionality of the module is only guaranteed within the specified
operational normal voltage range.
Note that the module cannot be switched on if the VCC voltage value is below the specified normal
operating range minimum limit: ensure that the input voltage at VCC pin is above the minimum limit of
the normal operating range for more than 1 second after the start of the switch-on of the module.
When LEON-G100/G200 modules are in operation, the voltage provided to VCC pin can exceed the normal
operating range limits but must be within the extended operating range limits specified in LEON-G100/G200
Data Sheet [1]. Module reliability is only guaranteed within the specified operational extended voltage range.
Note that the module switches off when VCC voltage value drops below the specified extended
operating range minimum limit: ensure that the input voltage at VCC pin never drops below the
minimum limit of the extended operating range when the module is switched on, not even during a
GSM transmit burst, where the current consumption can rise up to maximum peaks of 2.5 A in case of a
mismatched antenna load.
Operation above the extended operating range maximum limit is not recommended and
extended exposure beyond it may affect device reliability.
Stress beyond the VCC absolute maximum ratings may cause permanent damage to the module:
if necessary, voltage spikes beyond VCC absolute maximum ratings must be limited to values
within the specified boundaries by using appropriate protection.
When designing the power supply for the application, pay specific attention to power losses and
transients. The DC power supply has to be able to provide a voltage profile to the VCC pin with the
following characteristics: