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LZT 123 1834 37
5.4 Grounds
Pin Name Direction Function
2 GND - Ground
4 GND - Ground
6 GND - Ground
8 GND - Ground
10 GND - Ground
12 GND - Ground
60 AREF - Analogue reference
There are two ground connections in the wireless modem, AREF (analogue ground)
and GND (digital ground). Pin assignments are shown in the table above.
AREF and GND are connected at a single point inside the wireless
modem, however they must not be joined together in the user
application.
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 module) and output
(module to host). AREF is connected to the common GND inside the wireless modem
only. The application must not connect GND and AREF.
Parameter Limit Unit
Maximum current (I
MAX
) 12.5 mA
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 modem, 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
NOTE