Integrator's Manual GR47/GR48

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.
5.3 Grounds
There are two ground connections in the radio device, AGND (analogue
ground) and DGND (digital ground). Pin assignments are shown in the
table above.
1RWH AGND and DGND are connected at a single point inside the radio device.
They must not be joined together in your application.
5.3.1 Analogue Ground - AGND
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.
5.3.2 Digital Ground - DGND
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.
5.4 VCC - Regulated Power Supply Input
Power is supplied to the radio device VCC pins, from an external source.
Pin Signal Description
2, 4, 6, 8, 10, 12 DGND Digital ground
60 AGND Analogue ground
Parameter Limit
I
max
≅12.5 mA
Parameter Per Pin Total (5 Pins)
I
max
< 6.0A < 3.0A
I
avg
< 100mA < 600mA
Pins Signal Description
1, 3, 5, 7, 9 VCC regulated power supply input