User's Guide

LE910Cx Hardware User Guide
1VV0301298 Rev. 1.01 - 2016-02-16
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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
8.4. Serial Ports ....................................................................................................... 69
8.4.1. Modem Serial Port 1 Signals ................................................................. 70
8.4.2. Modem Serial Port 2 ............................................................................. 71
8.4.3. RS232 Level Translation ........................................................................ 72
8.5. Peripheral Ports ............................................................................................... 74
8.5.1. SPI – Serial Peripheral Interface ........................................................... 74
8.5.2. I2C - Inter-integrated Circuit ................................................................ 75
8.5.3. SD/MMC Card Interface ....................................................................... 75
8.5.4. WiFi SDIO Interface .............................................................................. 77
8.6. Audio Interface ................................................................................................ 78
8.6.1. Digital Audio ......................................................................................... 78
8.6.1.1. Short Frame Timing Diagrams .............................................. 79
8.6.1.2. Long Frame Timing Diagrams ............................................... 81
8.7. General Purpose I/O ........................................................................................ 83
8.7.1. Using a GPIO Pad as Input .................................................................... 85
8.7.2. Using a GPIO Pad as an interrupt / Wakeup source ............................. 85
8.7.3. Using a GPIO Pad as Output ................................................................. 85
9. Miscellaneous Functions .................................................................................. 87
9.1. Indication of Network Service Availability ....................................................... 87
9.2. Indication of Software Ready ........................................................................... 88