u-blox SARA-R4 Series, Руководство по системной интеграции

Страница: 18 / 102

SARA-R4 series - System Integration Manual
UBX-16029218 - R06 System description
Page 18 of 102
1.5.1.4 VCC current consumption in active mode (power saving 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 configuration is disabled, as it is by default (see
SARA-R4 series AT Commands Manual [2],
+CPSMS AT command for details), the module does not automatically enter the PSM low power deep sleep
mode whenever possible: the module remains in active mode. Otherwise, if the power saving configuration is
enabled, the module enters PSM low power deep sleep mode whenever possible (see section 1.13.9).
Figure 4 illustrates a typical example of the module current consumption profile when the module is in active
mode. 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
SARA-R4 series Data Sheet [1].
ACTIVE MODE
Paging period
Time [s]
Current [mA]
Time [ms]
Current [mA]
RX
Enabled
0
100
0
100
Figure 4: 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
1.5.2 Generic digital interfaces supply output (V_INT)
The V_INT output pin of the SARA-R4 series 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
SARA-R4 series 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.