User's Manual

LE940B6 Hardware User Guide
1VV0301331 Rev. 1.8 - 2017-03-15
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7.5. PCB Guidelines in case of FCC certification ..................................................... 65
7.5.1. Transmission line design....................................................................... 65
7.5.2. Transmission line measurements ......................................................... 66
8. Hardware Interfaces......................................................................................... 69
8.1. USB Port ........................................................................................................... 70
8.2. Serial Ports ....................................................................................................... 71
8.2.1. Modem Serial Port 1 ............................................................................. 72
8.2.2. Modem Serial Port 2 ............................................................................. 73
8.2.3. Modem Serial Port 3 ............................................................................. 73
8.2.4. RS232 Level Translation ........................................................................ 74
8.3. Peripheral Ports ............................................................................................... 76
8.3.1. SPI – Serial Peripheral Interface ........................................................... 76
8.3.2. I2C - Inter-integrated Circuit ................................................................ 77
8.4. Ethernet Interface ............................................................................................ 77
8.5. Audio Interface ................................................................................................ 78
8.5.1. Analog Audio ........................................................................................ 78
8.5.2. Digital Audio ......................................................................................... 79
8.6. General Purpose I/O ........................................................................................ 79
8.6.1. Using a GPIO Pad as Input .................................................................... 80
8.6.2. Using a GPIO Pad as Output ................................................................. 80
9. Miscellaneous Functions .................................................................................. 82
9.1. Indication of Network Service Availability ....................................................... 82
9.2. RTC – Real Time Clock ...................................................................................... 83
9.3. VAUX Power Output ........................................................................................ 83
9.4. ADC Converter ................................................................................................. 83
9.4.1. Description............................................................................................ 83
9.4.2. Using the ADC Converter ...................................................................... 83
9.5. Using the Temperature Monitor Function ...................................................... 84
9.6. Fuel Gauge (TBD) ............................................................................................. 84
9.7. eFuse ................................................................................................................ 84