Iridium Communications, Inc. Information Contained in this Guide
Iridium 9523 Product Developers’ Guide is Subject to Change Without Notice
Revision 2.6
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3 Electrical Interfaces
The following subsections contain information for the electrical interfaces of the Iridium 9523 for the non-
RF connections. The RF interface is covered in Section 4.
3.1 User Connector
Table 5 lists the connections to the Iridium 9523 on the user connector.
Table 5: Signal Groups on User Connector
Signal group Signal function
PCM Digital Audio Two synchronous serial interfaces carrying 16-bit, 8 kHz sample rate
PCM audio data
Each port has 4 wires – data in each direction, clock and frame signals
Only one digital audio port is in use at any time
Port 1 has a secondary function during factory testing, to carry the 90ms
frame synchronization from the test equipment
DPL port Serial asynchronous control interface
2 wires – data in each direction
Data/Fax port Serial asynchronous control interface
8 wires – data in each direction plus control signals
The full set of control signals may be used for a Data/Fax port
SIM interface Standard SIM signals
5 wires – data, clock, reset, enable, voltage select
Power Battery Supply to Iridium 9523
5 power pins – 3x battery voltage and 2x boost voltage
6 grounds
1 boost regulator control line (PA_BOOST_EN)
GPIO, antenna
configuration
2 wires – ANT_DET_PWR and FULL_POWER_EN. Signals provided as
a mechanism to restrict the transmitted power – for example in order to
meet SAR standards.
Other GPIO 2 wires – TX_ACTIVE which may be used as an output to indicate when
the transmitter is active, and LBT_HSTB which determines the operating
mode of the software on the Iridium 9523.
3.1.1 User Connector Type
The connector on the Iridium 9523 is a 40-way, 0.5 mm pitch Molex low-profile header connector, part
number 54102-0404.
This connector provides the ability for a stackable board-to-board configuration, allowing connection to
the host system motherboard via a mating 53885-0408 socket.
Data sheets on these connectors can be found at: http://www.molex.com
Pin numbering schemes for the Molex connectors on the Iridium 9523 and the host FA board are shown
in Figure 5 (both pictures show the pin-out when looking down onto the boards).
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