Ublox LISA-U2 Series, System Integration Manual

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LISA-U2 series - System integration manual
UBX-13001118 - R27 Features description Page 158 of 183
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3.22 Power saving
The power saving configuration is disabled by default, but it can be enabled using the AT+UPSV
command. When power saving is enabled, the module automatically enters the low-power idle mode
whenever possible, reducing current consumption.
During the low-power idle mode, the module is not ready to communicate with an external device by
means of the application interfaces, since it is configured to reduce power consumption. The module
wakes up from the low-power idle mode to the active mode in these events:
•
Automatic periodic monitoring of the paging channel for the paging block reception according to
network conditions (see sections
1.5.3.3 , 1.9.2.3 )
• Automatic periodic enable of the UART interface to receive and send data, if AT+UPSV=1 has been
set (see section
1.9.2.3 )
• Data received on the UART interface, if HW flow control has been disabled by AT&K0 and
AT+UPSV=1 has been set (see section
1.9.2.3 )
• RTS input set ON by the DTE if HW flow control has been disabled by AT&K0 and AT+UPSV=2 has
been set (see section 1.9.2.3 )
• DTR input set ON by DTE if AT+UPSV=3 has been set (not supported by the “01” product versions,
see section 1.9.2.3 )
• USB detection, applying 5 V (typ.) to VUSB_DET input (see section 1.9.3 )
• The connected USB host forces a remote wake-up of the module as a USB device (see section
1.9.3 )
• The connected SPI host indicates by means of the SPI_MRDY input signal of the module that it is
ready for transmission or reception over the SPI interface (see section 1.9.4 )
• The connected u-blox GNSS receiver indicates by means of the GPIO3 pin previously configured
for the “GNSS data ready” function that it is ready to send data over the I2C / DDC interface (see
sections 1.10 , 1.12 )
• RTC alarm previously configured by AT command (see the u-blox AT commands manual [2] ,
AT+CALA)
For the complete description of the AT+UPSV command, see the u-blox AT commands manual [2] .
For the definition and the description of LISA-U2 series modules operating modes, including the
events forcing transitions between the different operating modes, see section
1.4 .
For the description of current consumption in idle and active operating modes, see sections 1.5.3.3 ,
1.5.3.4 .
For the description of the UART behavior related to module power saving configuration, see section
1.9.2.3 .
For the description of the USB behavior related to module power saving configuration, see section
1.9.3.2 .
For the description of the SPI behavior related to module power saving configuration, see section
1.9.4.2 .