Specifications

AC65/AC75 Hardware Interface Description
3.2 Power Supply
s
AC65_AC75_HD_v01.002 Page 28 of 117 2006-10-30
Confidential / Released
3.2.2 Measuring the Supply Voltage (V
BATT+
)
The reference points for measuring the supply voltage V
BATT+
on the module are BATT+ and GND, both acces-
sible at a capacitor located close to the board-to-board connector of the module.
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 AC65/AC75 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
Reference
point
BATT+
point GND