u-blox UBX-G7020 - Contents; Table of Contents

UBX-G7020 - Hardware Integration Manual
Contents
GPS.G7-HW-10003 Objective Specification Page 5 of 74
Contents
Preface ................................................................................................................................ 3
Contents .............................................................................................................................. 5
1 Hardware Description .................................................................................................. 8
1.1 Overview .............................................................................................................................................. 8
1.2 Architecture .......................................................................................................................................... 8
2 Design-in ....................................................................................................................... 9
2.1 Power management ........................................................................................................................... 10
2.1.1 Power domains............................................................................................................................ 10
2.1.2 Supply voltages ........................................................................................................................... 12
2.1.3 Built in supply monitors ............................................................................................................... 15
2.1.4 Operating Modes ........................................................................................................................ 15
2.2 PIOs .................................................................................................................................................... 16
2.2.1 SQI Flash memory ........................................................................................................................ 17
2.2.2 Configuration pins ...................................................................................................................... 18
2.2.3 Communication interfaces ........................................................................................................... 19
2.2.4 Time pulse ................................................................................................................................... 21
2.2.5 External interrupt ........................................................................................................................ 21
2.2.6 SAFEBOOT_N Pin/ Safe Boot Mode .............................................................................................. 21
2.2.7 Active Antenna Supervisor ........................................................................................................... 22
2.3 System reset ....................................................................................................................................... 24
2.4 Clock generation ................................................................................................................................ 25
2.4.1 Clock accuracies and tolerances .................................................................................................. 25
2.4.2 Crystal or TCXO package selection .............................................................................................. 26
2.4.3 Frequency perturbations .............................................................................................................. 26
2.4.4 Crystal oscillator .......................................................................................................................... 27
2.4.5 TCXO .......................................................................................................................................... 28
2.5 Real-Time Clock (RTC) ........................................................................................................................ 30
2.5.1 RTC using a crystal ...................................................................................................................... 30
2.5.2 RTC derived from the system clock; “Single Crystal” Feature ....................................................... 30
2.5.3 RTC using an external clock ......................................................................................................... 30
2.5.4 Time aiding ................................................................................................................................. 30
2.6 RF front-end ....................................................................................................................................... 32
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