User's Guide
LE910Cx Hardware User Guide
1VV0301298 Rev. 1.04 - 2017-05-25
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7.5.
GNSS Antenna Requirements .......................................................................... 64
7.5.1.
Combined GNSS Antenna ..................................................................... 64
7.5.2.
Linear and Patch GNSS Antenna ........................................................... 64
7.5.3.
Front End Design Considerations ......................................................... 64
7.5.4.
GNSS Antenna – PCB Line Guidelines ................................................... 65
7.5.5.
GNSS Antenna – Installation Guidelines ............................................... 66
8.
Hardware Interfaces......................................................................................... 67
8.1.
USB Port ........................................................................................................... 68
8.2.
HSIC Interface .................................................................................................. 69
8.3.
SGMII Interface (optional) ............................................................................... 69
8.3.1.
Ethernet Control interface ................................................................... 69
8.4.
Serial Ports ....................................................................................................... 70
8.4.1.
Modem Serial Port 1 Signals ................................................................. 71
8.4.2.
Modem Serial Port 2 ............................................................................. 72
8.4.3.
RS232 Level Translation ........................................................................ 73
8.5.
Peripheral Ports ............................................................................................... 75
8.5.1.
SPI – Serial Peripheral Interface ........................................................... 75
8.5.2.
I2C - Inter-integrated Circuit ................................................................ 76
8.5.3.
SD/MMC Card Interface ....................................................................... 76
8.5.4.
WiFi SDIO Interface .............................................................................. 78
8.6.
Audio Interface ................................................................................................ 80
8.6.1.
Digital Audio ......................................................................................... 80
8.6.1.1.
Short Frame Timing Diagrams .............................................. 81
8.6.1.2.
Long Frame Timing Diagrams ............................................... 83
8.7.
General Purpose I/O ........................................................................................ 85
8.7.1.
Using a GPIO Pad as Input .................................................................... 87
8.7.2.
Using a GPIO Pad as an interrupt / Wakeup source ............................. 87
8.7.3.
Using a GPIO Pad as Output ................................................................. 87
9.
Miscellaneous Functions .................................................................................. 89
9.1.
Indication of Network Service Availability ....................................................... 89