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LZT 123 1836 32
5.4 Grounds
Pin Name Direction Function
1 GND - Ground
3 GND - Ground
5 GND - Ground
7 GND - Ground
9 GND - Ground
11 GND - Ground
96 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
NOTE