SARA-R4 series - System integration manual
UBX-16029218 - R20 System description Page 25 of 128
C1-Public
Figure 10 illustrates the current consumption profiles in GPRS connected mode, in 850 or 900 MHz
bands, with 4 slots used to transmit and 1 slot used to receive, as for the GPRS multi-slot class 12.
Figure 10: VCC current consumption profile versus time during a GPRS multi-slot class 12 connection (4 TX slots, 1 RX slot)
In case of EGPRS (i.e. EDGE) connections, the VCC current consumption profile is very similar to the
one during GPRS connections: the current consumption profile in GPRS multi-slot class 12 connected
mode illustrated in the Figure 10 is representative for the EDGE multi-slot class 12 connected mode
as well.
1.5.1.4 VCC current consumption in ultra low power deep sleep mode
The use of the User Equipment Power Saving Mode defined in 3GPP Rel.13 is by default disabled, but
it can be enabled using the +CPSMS AT command (see the SARA-R4 series AT commands manual [2]
the application development guide [4]). When the use of the PSM is enabled, the module automatically
enters the PSM and the ultra low power deep sleep mode whenever possible.
SARA-R422, SARA-R422S and SARA-R422M8S modules may automatically enter the ultra low power
deep sleep mode in-between eDRX cycles, whenever possible, if the functionality is enabled using the
+UPSMVER AT command (see the AT commands manual [2] and application development guide [4]).
When in ultra low power deep sleep mode, the current consumption is reduced down to a steady value
in the µA range: only the RTC runs with internal 32 kHz reference clock frequency.
Detailed current consumption values can be found in the SARA-R4 series data sheet [1].
☞ Due to RTC running during PSM mode, the Cal-RC turns on the crystal every ~10 s to calibrate the
RC oscillator, as a consequence, a very low spike in current consumption will be observed.
Figure 11: Example of VCC current consumption profile in ultra low power deep sleep mode with the use of the PSM enabled
enabled (AT+CPSMS≠0), module registered with the network: the module is in ultra low power deep sleep mode, with no
concurrent activities executed, and it does not periodically wake up for paging block reception, but it wakes up upon the
expiration of the periodic update timer set by the network or due to proper toggling of the PWR_ON / PWR_CTRL input line
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