Sony Ericsson GR47/GR48 Manuale Utente

5. SYSTEM CONNECTOR INTERFACE

23

LZT 123 7589 R1A

• The SIM output signals and the SIMVCC supply will continuously 

withstand a short circuit to any voltage within the range 0 V to 4.1V.

There are two ground connections in the radio device, AGND (analogue 
ground) and DGND (digital ground). Pin assignments are shown in the 
table above.

AGND and DGND are connected at a single point inside the radio device. 
They must not be joined together in your application.

AGND is the return signal, or analogue audio reference, for ATMS (Audio 
To Mobile Station) and AFMS (Audio From Mobile Station). It is 
connected to the DGND inside the radio device only. The application must 
not connect DGND and AGND. 

DGND is the reference or return signal for all system interface digital 
signals and is also the d.c. return for SERVICE and the power supply, VCC. 
Connect all DGND pins together in your application in order to carry the 
current drawn by the radio device.

Power is supplied to the radio device VCC pins, from an external source.

2, 4, 6, 8, 10, 12

DGND

Digital ground

60

AGND

Analogue ground

I

max 

 

≅

12.5 mA

I

max

< 6.0A

 < 3.0A 

I

avg

< 100mA

< 600mA

1, 3, 5, 7, 9

VCC

regulated power supply input