Analogue Ground (Aref); Common Ground (Gnd) - Wavecom GR64 GSM/GPRS Integrator's Manual

5.4.1

Analogue Ground (AREF)

AREF is the return signal, or analogue audio reference, for AUXI and AUXO. These two
signals provide a single-ended auxiliary audio input (host to Wireless CPU) and output
(Wireless CPU to host). AREF is connected to the common GND inside the Wireless
CPU only. The application must not connect GND and AREF. AREF is to be used as a
reference signal for the application AUXI and AUXO amplifiers (see figure below).
Figure 9: AREF implementation example for AUXI and AUXO
Parameter
Maximum current (I
5.4.2

Common Ground (GND)

GND is the reference, or return signal, for all system interface digital signals, radio
section power, and is also the DC return for the power supply, VCC.
To carry the high current drawn by the Wireless CPU, the user application circuitry
should connect all GND pins together.
Parameter
Maximum current (I
Maximum average current (I
GR64 Integrators Manual
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)
MAX
)
MAX
)
AVG
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Limit
12.5
Per Pin Total
600 3600
100 600
Unit
mA
Unit
mA
mA