General Protection Requirements; Grounds; Analogue Ground - Agnd - Sony Ericsson GR47 Integrator's Manual

All manuals and user guides at all-guides.com
Note!
Unused pins can be left floating.

General Protection Requirements

5.2.1
• All 2.75 V digital inputs will continuously withstand and suffer
• All 2.75 V digital outputs will continuously withstand a short
• All analogue outputs will continuously withstand a short
• The SIM output signals and the SIMVCC supply will
Note!
Although the unit should be able to withstand the higher
voltages the unit should not be driven at the levels as it will
result in failures over time.

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

Analogue Ground - AGND

5.3.1
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.
LZT 123 7589 R2B
SYSTEM CONNECTOR INTERFACE
Low Level Output Voltage (V
High Level Input Voltage (V
IH
Low Level Input voltage (V )
IL
no damage in the power-on or power-off condition when
subjected to any voltage from - 0.5 V to 3.47 V (3.3 V + 5 %).
circuit to any other voltage within the range 0 V to 3 V.
circuit to any voltage within the range 0 V to 3 V.
continuously withstand a short circuit to any voltage within
the range 0 V to 4.1V.
Pin Signal
2, 4, 6, 8, 10, 12 DGND
60 AGND
), I = 2mA 0
OL o
) 1.93
0
Description
Digital ground
Analogue ground
0.6 V
2.75 V
0.5 V
25