5.7.3.1 Asynchronous Serial Port (USIF1) 44
5.7.3.2 Auxiliary Serial Port 44
5.8 General Purpose I/O 45
5.8.1 Using a GPIO as INPUT 45
5.8.2 Using a GPIO as OUTPUT 46
5.9 External SIM Holder 46
5.10 ADC Converter 46
5.10.1 Using ADC Converter 47
5.11 DAC Converter 47
5.11.1 Enabling DAC 47
5.12 CTANK 47
5.13 Forced USB Boot 47
5.14 Antenna Tuner 48
5.14.1 GPIO 48
5.14.2 MIPI 48
6.1 Antenna Requirements 49
6.1.1 PCB Design Guidelines 50
6.1.2 PCB Guidelines in Case of FCC Certification 51
6.1.2.1 Transmission Line Design 52
6.1.2.2 Transmission Line Measurements 52
6.1.2.3 Antenna Installation Guidelines 54
7.1 Electrical Characteristics 56
8.1 GNSS Signals Pin-out 57
8.2 RF Front End Design 57
8.2.1 PCB Guidelines for GNSS Antenna 57
8.2.2 Hardware-based Solution for GNSS and LTE Coexistence 58
8.3 GNSS Antenna Requirements 58
8.3.1 GNSS Antenna Specification 59
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