u-blox LEXI-R422, Руководство по системной интеграции

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LEXI-R422 - System integration manual
UBX-23007449 - R02 System description Page 21 of 108
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1.5.1.6 VCC current consumption in active mode (PSM / low power disabled)
The active mode is the state where the module is switched on and ready to communicate with an
external device by means of the application interfaces (as the USB or the UART serial interface). The
module processor core is active, and the 19.2 MHz reference clock frequency is used.
If power saving mode and/or low power mode configurations are disabled, as it is by default (see the
AT commands manual
[2] , +CPSMS, +UCPSMS, +UPSMVER, +UPSV AT commands for details), the
module remains in active mode. Otherwise, if PSM mode and/or low power mode configurations are
enabled, the module enters PSM mode and/or low power mode whenever possible.
Figure 10 illustrates a typical example of the module current consumption profile when the module is
in active mode. The module is registered to the network. When 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 LEXI-R422 data sheet [1] .
ACTIVE MODE
Paging period
Time [s]
Current [mA]
Time [ms]
Current [mA]
RX
Enabled
0
100
0
100
Figure 10: Example of VCC current consumption profile with low power mode disabled (AT+UPSV=0))
1.5.2 Generic digital interfaces supply output (V_INT)
The V_INT output pin of LEXI-R422 modules is generated by the module internal power management
circuitry when the module is switched on and it is not in the deep-sleep power saving mode.
The typical operating voltage is 1.8 V, whereas the current capability is specified in the LEXI-R422
data sheet
[1] . The V_INT voltage domain can be used in place of an external discrete regulator as a
reference voltage rail for external components.