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LEON-G100/G200 - System Integration Manual

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

Page 16 of 75

1.5 Power management

1.5.1 Power supply circuit overview

Figure 3: Power supply concept

LEON G100 / LEON-G200 modules are supplied via the VCC pin. There is only one main power supply pin.

The VCC pin connects the RF Power Amplifier and the integrated power management unit within the module:

all supply voltages needed by the module are generated from the VCC supply by integrated voltage regulators.

When the VCC voltage is within the valid operating range, the module supplies the Real Time Clock. If the VCC

voltage is under the minimum operating limit, the Real Time Clock can be externally supplied via the V_BCKP

pin.

When a 1.8 V or a 3 V SIM card type is connected, LEON G100 / LEON-G200 automatically supply the SIM card

via the VSIM pin. Activation and deactivation of the SIM interface with automatic voltage switch from 1.8 to 3 V

is implemented, in accordance to the ISO-IEC 78-16-e specifications.

The integrated power management unit also provides the control state machine for system start up, including

start up with discharged batteries, pre-charging and system reset control.

LEON-G100 / LEON-G200 feature a power management concept optimized for most efficient use of battery

power. This is achieved by hardware design utilizing power efficient circuit topology, and by power management

software controlling the power saving mode of the module. Battery management runs in the context of the

operation and maintenance process:

Battery charging control, in order to maintain the full capacity of the battery

V_BCKP

GSM/GPRS Chipset

PSRAM

NOR Flash

MCP Memory

4-Bands GSM FEM

Antenna

Switch

LDOs

LDO

RTC

LDO

EBU

Charging Control

1 µF

LDO

1 µF

VSIM

VCC

LEON-G100/G200

47 µF

V_BCKP

GSM/GPRS Chipset

PSRAM

NOR Flash

MCP Memory

4-Bands GSM FEM

Antenna

Switch

LDOs

LDO

RTC

LDO

EBU

Charging Control

1 µF

LDO

1 µF

VSIM

VCC

LEON-G100/G200

47 µF

1 2 ... 11 12 13 14 15 16 17 18 19 20 21 ... 74 75

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