Specifications

Cinterion
®
PLSx3 Hardware Interface Description
3.4 Power Supply
89
t PLSx3_HID_v01.002d 2021-08-24
Public / Released
Page 87 of 129
3.4.2 Minimizing Power Losses
If the module supports GSM, when designing the power supply for your application, please pay
specific attention to power losses. Ensure that the input voltage V
BATT+,
never drops below 3.0V
on the PLSx3 board, not even in a transmit burst where current consumption can rise to typical
peaks. Any voltage drops that may occur in a transmit burst should not exceed 400mV to en-
sure the expected RF performance in 2G networks.
For example,
V
Imin
=3.0V, D
max
=0.4V
V
BATT
min= V
Imin
+D
max
=3.4V
Figure 33: Power supply limits during transmit burst
3.4.3 Monitoring Power Supply by AT Command
To monitor the supply voltage, you can use the AT^SBV command which returns the current
value of the supply voltage using AT interface.
1. Note: Current consumption ratings are based on measurements done in a laboratory test environment, and
deviations may occur from the given typical ratings. Under real life conditions however, with e.g., varying net-
work quality, location changes, or changing supply currents, the deviations from these typical ratings may be
even bigger, and will have to be taken into account for actual power supply solutions. For more details on
power supply design see [3].
2. With an impedance of Z
LOAD
=50Ω at the antenna pad. Measured at 25°C and 3.8V.
3. Measurements start 6 minutes after switching ON the module,
averaging times: SLEEP mode – 3 minutes, transfer modes – 1.5 minutes
Communication tester settings:no neighbor cells, no cell reselection etc.,
RMC (Reference Measurement Channel)
SLEEP mode is enabled via AT command AT^SPOW=2, 1000, 3
4. The power save mode is disabled via AT command AT^SPOW=1,0,0
5. Communication tester setting:
Channel: Mid Channel
Channel Bandwidth: 5MHz
Number of Resource Blocks: 25 (DL), 1 (UL), RB position: Low
Modulation: QPSK