LEON-G100 / LEON-G200 - System Integration Manual
GSM.G1-HW-09002-G3
Preliminary
System description
Page 13 of 125
1.4
Operating modes
LEON-G100/LEON-G200 modules include several operating modes, each have different features and interfaces.
Table 2 summarizes the various operating modes and provides general guidelines for operation.
Operating Mode
Description
Features / Remarks
Transition condition
General Status: Power-down
Not-Powered
Mode
VCC
supply not present or
below normal operating
range.
Microprocessor switched off
(not operating).
RTC only operates if supplied
through
V_BCKP
pin.
Module is switched off.
Application interfaces are not accessible.
Internal RTC timer operates only if a valid
voltage is applied to
V_BCKP
pin.
Any external signal connected to the
UART I/F, I
2
S I/F, HS_DET, GPIOs must be
tristated to avoid an increase of module
power-off consumption.
Module cannot be switched on by a
falling edge provided on the
PWR_ON
input, neither by a preset RTC alarm, nor
by charger detection on the
V_CHARGE
and
CHARGE_SENSE
pins.
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
Application interfaces are not accessible.
Only internal RTC timer in operation.
Any external signal connected to the
UART I/F, I
2
S I/F, HS_DET, GPIOs must be
tristated to avoid an increase of the
module power-off consumption.
Module can be switched on by a falling
edge provided on the
PWR_ON
input, by
a preset RTC alarm, or by charger
detection on the
V_CHARGE
and
CHARGE_SENSE
pins.
General Status: Normal Operation
Idle-Mode
Microprocessor runs with
32 kHz as reference oscillator.
Module does not accept data
signals from an external
device.
If power saving is enabled, the module
automatically enters idle mode whenever
possible.
If hardware flow control is enabled, the
CTS
line indicates that the module is in
active-mode and the UART interface is
enabled: the line is driven in the OFF
state when the module is not prepared
to accept data by the UART interface.
If hardware flow control is disabled, the
CTS
line is fixed to ON state.
Module by default is not set to
automatically enter idle mode whenever
possible, unless power saving
configuration is enabled by appropriate
AT command (refer to
u-blox AT
Commands Manual
[2], AT+UPSV).
If the module is registered with the
network and power saving is enabled, 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 and power saving is enabled, it
automatically enters idle mode and
periodically wakes up to monitor external
activity.
Module wakes up from idle-mode to
active-mode for an incoming voice or
data call.
Module wakes up from idle mode to
active mode if an RTC alarm occurs.
Module wakes up from idle mode to
active mode when data is received on
UART interface (refer to 1.9.1 section).
Module wakes up from 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 (refer to 1.9.1 section).
Active-Mode
Microprocessor runs with
26 MHz as reference
oscillator.
The module is ready 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.
If power saving is enabled, the module
automatically enters idle mode whenever
possible.
