Iridium Certus 9770 - Abbreviations; Digital Interface; Power Supply

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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).