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LEON-G100/G200 - System Integration Manual

GSM.G1-HW-09002-C Preliminary System description

Page 17 of 75

Collecting and processing of measurements of battery voltage

1.5.2 Voltage supply (VCC)

LEON G100 / LEON-G200 modules must be supplied through the 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 1.5.2.1). The DC

power supply can be selected from:

A switching regulator with appropriate power capabilities, low output ripple, and with a switching

frequency greater or equal to 1 MHz

An LDO linear regulator with appropriate power capabilities and with proper power dissipation

A rechargeable Li-Ion battery with a capacity from 500 mAh up to 1100 mAh (recommended)

A primary (not rechargeable) battery with appropriate power capabilities

The voltage provided to the 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

minimum and maximum VCC voltage range.

Ensure that the input voltage at the VCC is above the normal operating range minimum limit to enable the

switch-on of the module. Note that the module cannot be switched on if the VCC voltage value is below

the minimum specified limit. See LEON-G100/G200 Data Sheet [1].

When the LEON G100 / LEON-G200 modules are in operation, the voltage provided to the VCC pin can exceed

the normal operating range limits but must be within the extended operating range limits specified in the

LEON-G100/G200 Data Sheet [1]. Module reliability is only guaranteed within the specified operational extended

voltage range.

Ensure that the input voltage at the VCC pin never drops below the extended operating range minimum

limit 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. Note that the

module switches off when the VCC voltage value drops below the minimum limit.

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:

do not exceed 200 mV voltage drops during transmit bursts

avoid undershoot and overshoot on voltage drops at the start and at the end of a transmission

minimize voltage ripple on the supply

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