Technical data

4.4.1 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 10: AREF implementation example for AUXI and AUXO
Parameter Limit Unit
Maximum current (I
MAX
) 12.5 mA
4.4.2 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 Per Pin Total Unit
Maximum current (I
MAX
) 600 3600 mA
Maximum average current (I
AVG
) 100 600 mA
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GR64 Integrators’ Manual
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