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.

NOTE

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 (IMAX)

12.5

 

mA

LZT 123 1836

32