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disclosed without written approval from Iridium Satellite LLC.
IR3142-ICD-006 Issue 1 v2.1
Page 7 of 16
1.2
Abbreviations
Name
Description
CE
Conformité Européene
DTMF
Dual Tone Multi Frequency
FCC
Federal Communications Commission
GPIO
General Purpose Input/Outputs
GND
Ground
IC
Industry Canada
RH
Relative Humidity
SD card
Secure Digital (a non-volatile memory card)
SP
Service Provider
SPI
Serial Parallel Interface
UART
Universal Asynchronous Receiver Transmitter
VAM
Value-Added Manufacturer
VSWR
Voltage Standing Wave Ratio
2 Digital Interface
The digital interface to the Iridium Certus 9770 consists of the following interfaces:
•
Four UARTs
•
UART_A: Command and control functionality
•
UART_B: Transfer of user data
•
UART_C: Reserved
•
UART_D: Reserved
•
I²S bus for transfer of digital audio samples used in voice calls
•
SPI bus for Iridium diagnostics to assist VAM troubleshooting
•
Several GPIO lines for status and control
•
Power input
•
Ground return
•
SIM card interface
2.1
Power Supply
The Iridium Certus 9770 transceiver has a single voltage power supply input (EXT_PWR).
