LE910C1 Hardware User Guide
1VV0301298 Rev. 1.08 - 2017-11-14
Reproduction forbidden without written authorization by Telit Communications S.p.A. - All Rights Reserved
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7.3. GSM/WCDMA/LTE Antenna – Installation Guidelines .................................... 66
7.4. Antenna Diversity Requirements ..................................................................... 66
7.5. GNSS Antenna Requirements .......................................................................... 67
7.5.1. Combined GNSS Antenna ..................................................................... 67
7.5.2. Linear and Patch GNSS Antenna ........................................................... 67
7.5.3. Front End Design Considerations ......................................................... 67
7.5.4. GNSS Antenna – PCB Line Guidelines ................................................... 68
7.5.5. GNSS Antenna – Installation Guidelines ............................................... 69
8. Hardware Interfaces......................................................................................... 70
8.1. USB Port ........................................................................................................... 71
8.2. HSIC Interface .................................................................................................. 72
8.3. SGMII Interface (optional) ............................................................................... 72
8.3.1. Ethernet Control interface ................................................................... 72
8.4. Serial Ports ....................................................................................................... 73
8.4.1. Modem Serial Port 1 Signals ................................................................. 74
8.4.2. Modem Serial Port 2 ............................................................................. 75
8.4.3. RS232 Level Translation ........................................................................ 76
8.5. Peripheral Ports ............................................................................................... 78
8.5.1. SPI – Serial Peripheral Interface ........................................................... 78
8.5.2. I2C - Inter-integrated Circuit ................................................................ 79
8.5.3. SD/MMC Card Interface ....................................................................... 79
8.5.4. WiFi SDIO Interface .............................................................................. 81
8.6. Audio Interface ................................................................................................ 83
8.6.1. Digital Audio ......................................................................................... 83
8.6.1.1. Short Frame Timing Diagrams .............................................. 84
8.6.1.2. Long Frame Timing Diagrams ............................................... 86
8.7. General Purpose I/O ........................................................................................ 88
8.7.1. Using a GPIO Pad as Input .................................................................... 90
8.7.2. Using a GPIO Pad as an interrupt / Wakeup source ............................. 90
8.7.3. Using a GPIO Pad as Output ................................................................. 90
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