EGS5 Hardware Interface Description
3.2 Power Supply
75
EGS5_HD_v02.004
Page 27 of 123
2012-02-09
Confidential / Released
3.2.2
Measuring the Supply Voltage V
BATT+
To measure the supply voltage V
BATT+
it is possible to define two reference points GND and
BATT+. GND should be the module’s baseband shielding, while BATT+ should be a test pad
on the external application the module is mounted on. The external BATT+ reference point has
to be connected to and positioned close to the SMT application interface’s BATT+ pads 68 or
74 as shown in
.
Figure 4:
Position of the reference points BATT+ and GND
3.2.3
Monitoring Power Supply by AT Command
To monitor the supply voltage you can also use the AT^SBV command which returns the value
related to the reference points BATT+ and GND.
The module continuously measures the voltage at intervals depending on the operating mode
of the RF interface. The duration of measuring ranges from 0.5s in TALK/DATA mode to 50s
when EGS5 is in IDLE mode or Limited Service (deregistered). The displayed voltage (in mV)
is averaged over the last measuring period before the AT^SBV command was executed.
Reference point GND:
Module shielding
Reference point BATT+:
External test pad connected
to and positioned closely to
BATT+ pad 68 or 74.
External application
