LENA-R8 series - System integration manual
UBX-22015376 - R02
System description
Page 19 of 116
C1-Public
1.6.1.4
VCC consumption in low power idle mode
The power saving configuration is disabled by default, but it can be enabled using the appropriate AT
command (see the AT commands manual
, +UPSV AT command). When power saving is enabled,
the module automatically enters low power idle mode whenever possible, reducing consumption.
When the power saving configuration is enabled and the module is registered or attached to a
network, the module automatically enters the low power idle mode whenever possible, but it must
periodically monitor the paging channel of the current base station (paging block reception), in
accordance to 2G / LTE requirements, waking up periodically to receive the paging block. In between,
the module enters low power idle mode whenever possible. This is known as discontinuous reception
(DRX).
illustrates a typical example of the current consumption profile in this condition.
Detailed consumption values can be found in LENA-R8 series data sheet
IDLE MODE
ACTIVE MODE
IDLE MODE
Active mode
enabled
Idle mode
enabled
Time [s]
Current [mA]
Time [ms]
Current [mA]
RX
enabled
0
100
0
100
Paging period
floor current
Figure 8: VCC current consumption profile with power saving enabled and module registered with the network: the module
is in low-power idle mode and periodically wakes up to active mode to monitor the paging channel for paging block reception
1.6.1.5
VCC consumption in active mode (low power idle mode disabled)
The active mode is the state where the module is switched on and ready to communicate with an
external device by the application interfaces (as the USB or the UART serial interface). The module
processor core is active, and the 26 MHz reference clock frequency is used.
If the low power idle mode configuration is disabled, as it is by default (see AT commands manual
+UPSV AT commands for details), the module remains in active mode.
example of the module current consumption profile in this condition. In such case, the module is
registered with the network and while active mode is maintained, the receiver is periodically activated
to monitor the paging channel for paging block reception. Detailed current consumption values can
be found in the LENA-R8 series data sheet
ACTIVE MODE
Paging period
Time [s]
Current [mA]
Time [ms]
Current [mA]
RX
Enabled
0
100
0
100
Figure 9: VCC current consumption profile with power saving disabled and module registered with the network: active mode
is always held and the receiver is periodically activated to monitor the paging channel for paging block reception
