Ublox EVA-M8M, Руководство по интеграции оборудования

Страница: 4 / 45

EVA-M8M - Hardware Integration Manual
Contents
Preface ................................................................................................................................ 3
Contents .............................................................................................................................. 4
1 Hardware description .................................................................................................. 7
1.1 Overview .............................................................................................................................................. 7
2 Design-in ....................................................................................................................... 8
2.1 Power management ............................................................................................................................. 8
2.1.1 Overview ....................................................................................................................................... 8
2.1.2 Power management configuration ................................................................................................ 9
2.2 Interfaces ............................................................................................................................................ 10
2.2.1 UART interface ............................................................................................................................ 10
2.2.2 Display Data Channel (DDC) Interface ......................................................................................... 10
2.2.3 SPI Interface ................................................................................................................................ 11
2.2.4 USB interface............................................................................................................................... 11
2.2.5 SQI Flash memory ........................................................................................................................ 12
2.3 I/O Pins ............................................................................................................................................... 13
2.3.1 Time pulse ................................................................................................................................... 13
2.3.2 External interrupt ........................................................................................................................ 13
2.3.3 Active antenna supervisor ............................................................................................................ 13
2.3.4 Electromagnetic interference on I/O lines ..................................................................................... 14
2.4 Real-Time Clock (RTC) ........................................................................................................................ 14
2.4.1 RTC using a crystal ...................................................................................................................... 15
2.4.2 RTC derived from the system clock .............................................................................................. 15
2.4.3 RTC using an external clock ......................................................................................................... 15
2.4.4 Time aiding ................................................................................................................................. 15
2.5 RF input .............................................................................................................................................. 15
2.5.1 Active Antenna............................................................................................................................ 16
2.5.2 Passive Antenna .......................................................................................................................... 16
2.5.3 Improved Jamming Immunity ...................................................................................................... 16
2.6 Safe Boot Mode (SAFEBOOT_N pin) .................................................................................................... 17
2.7 RESET_N ............................................................................................................................................. 17
2.8 Design-in checklist .............................................................................................................................. 18
2.8.1 General considerations ................................................................................................................ 18
2.8.2 Schematic design-in for EVA-M8M .............................................................................................. 18
2.9 Pin description .................................................................................................................................... 19
2.10 Layout design-in checklist ............................................................................................................... 20
2.11 Layout ............................................................................................................................................. 20
2.11.1 Footprint ..................................................................................................................................... 21
2.11.2 Paste mask .................................................................................................................................. 21
2.11.3 Placement ................................................................................................................................... 21
UBX-14006179 - R01 Advance Information Contents
Page 4 of 45