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LEON-G100/G200 - System Integration Manual

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

Page 14 of 75

1.4 Operating Modes

LEON-G100/G200 modules include several operating modes, each have different active features and interfaces.

Table 2 summarizes the various operating modes and provides general guidelines for operation.

General Status

Operating Mode

Description

Features / Remarks

Power-down

Not-Powered Mode

VCC supply not present or

below normal operating range.

Microprocessor not operating.

RTC only operates if supplied

through V_BCKP pin.

Module is switched off.

Module cannot be switched on by a falling edge provided on

the PWR_ON input, neither by a preset RTC alarm, or a rising

edge to a valid voltage for charger detection provided on the

V_CHARGE and CHARGE_SENSE inputs.

Application interfaces not accessible.

Internal RTC timer operates only if a valid voltage is applied

to V_BCKP pin.

Any external signal connected to UART I/F, I2S I/F, HS_DET,

or a GPIO must be set low or tri-stated to avoid an increase

of module power-off consumption.

Power-Off Mode

VCC supply within normal

operating range.

Microprocessor not operating.

Only RTC runs.

Module is switched off: normal shutdown after sending the

AT+CPWROFF command (refer to u-blox AT Commands

Manual [2]).

Module can be switched on by a falling edge provided on

the PWR_ON input, by a preset RTC alarm, or by a rising

edge to a valid voltage for charger detection provided on the

V_CHARGE and CHARGE_SENSE inputs.

Application interfaces are not accessible.

Only the internal RTC timer in operation.

Any external signal connected to the UART I/F, I2S I/F,

HS_DET pin, or a GPIO must be set low or tri-stated to avoid

an increase of the module power-off consumption.

Normal operation

Idle-Mode

Microprocessor runs with 32

kHz as reference oscillator.

Module does not accept data

signals from an external device.

Module is switched on and is in idle mode (i.e. power saving

/ sleep mode).

Application interfaces disabled.

Module by default automatically enters idle mode whenever

possible, unless this mode is disabled by appropriate AT

command (refer to u-blox AT Commands Manual [2]).

If module is registered with the network, it automatically

enters idle mode and periodically wakes up to active mode

to monitor the paging channel for the paging block

reception according to network indication.

If module is not registered with the network, it automatically

goes in idle mode and periodically wakes up to monitor

external activity.

Module wakes up from default idle mode to active mode if

an RTC alarm occurs.

Module wakes up from default idle mode to active mode

when data received on UART interface with HW flow control

enabled.

Module wakes up from default idle mode to active mode if a

voice or data call incoming.

Module wakes up from default idle mode to active mode

when the RTS input line is set to the ON state by the DTE if

the AT+UPSV=2 command is sent to the module (feature not

enabled by default).

The hardware flow control output (CTS line) indicates when

the module is in idle (power saving mode): the line is driven

in the OFF state when the module is not prepared to accept

data signals.

Active-Mode

Microprocessor runs with 26

MHz as reference oscillator.

The module is prepared to

accept data signals from an

external device.

Module is switched on and is fully active: power saving is not

enabled.

The application interfaces are enabled.

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