Table of Contents
Advertisement
5.3 Grounds
5.3.1 Analogue Ground - AGND
5.3.2 Digital Ground - DGND
5.4 VCC - Regulated Power Supply Input
LZT 123 7589 R1A
5. SYSTEM CONNECTOR INTERFACE
• 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.
Pin
2, 4, 6, 8, 10, 12
60
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.
Parameter
I
max
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.
Parameter
Per Pin
I
< 6.0A
max
I
< 100mA
avg
Pins
1, 3, 5, 7, 9
Power is supplied to the radio device VCC pins, from an external source.
Signal
Description
DGND
Digital ground
AGND
Analogue ground
Limit
Signal
Description
VCC
regulated power supply input
12.5 mA
Total (5 Pins)
< 3.0A
< 600mA
23
Advertisement
Table of Contents
