Gemalto CINTERION DSB-Mini, Руководство пользователя

Страница: 14 / 30

DSB-Mini User Guide
3.3 Analog Audio Interface
23
c
dsb-mini_ug_v02 Page 14 of 30 2012-10-09
Confidential / Released
3.3 Analog Audio Interface
A standard PC headset can be connected via the two 3.5mm jack sockets (SPK=Speaker,
MIC=Microphone).
3.4 SIM Interface
The DSB-Mini has a dual SIM interface and provides two SIM card holders or alternatively two
land patterns for component SIMs to be soldered. The "SIM-Select" switch can be used to
specify the active SIM card. An LED will indicate this SIM card. The SIM card holder supports
SIM removal detection.
To manually switch between two inserted SIM cards during module operation please complete
the following steps:
•
Press and hold the "SIM-Eject" button. This simulates the CCIN signal, indicating to the
module that the SIM card has been removed.
• Set the "SIM-Select" switch to configure the active SIM card ("1" or "2").
• Release the "SIM-Eject" button to indicate to the module to restart the SIM software stack
and to activate the selected SIM card.
Please note that a combined operation with SIM cards inserted on both the Starter Kit and the
DSB-Mini is not supported.
3.4.1 Automatic Dual SIM Operation
To automatically control dual SIM operation, it is necessary to complete the same steps as de-
scribed above for the manual switch. To do this the two internal signals SIM_SELECT ("SIM-
Select" switch) and CCEJECT ("SIM-Eject" button) will have to be connected to the GPIO1 and
GPIO2 signals by removing resistor R21 (0
 ) and placing 0  resistors for R7 and R14 (for de-
tails see Appendix: Figure 6 and Figure 9 ).
The following functionality then applies for GPIO1 and GPIO2:
Having assigned the internal signals to the GPIO signals it is now possible to change the active
SIM card by automatically completing the steps described above for the manual control. The
GPIO signals can be configured and controlled by means of AT commands.
Table 3:
Automatic dual SIM operation
Module signal Function Modification Description
GPIO1 CCSELECT
("SIM-Select")
Place R14/0 Ω
instead of R21/0 Ω
Select SIM1 or SIM2
Low: SIM1
High: SIM2
GPIO2 CCEJECT
("SIM-Eject")
Place R7/0 Ω Eject the SIM
Low: SIM inserted (47k pull-down)
High: SIM ejected