u-blox EVA-8M, Руководство по интеграции оборудования

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EVA-8M and EVA-M8 series - Hardware Integration Manual
UBX-16010593 - R06 Page 3 of 47
Early Production Information
Contents
Document Information ................................................................................................................................ 2
Contents .......................................................................................................................................................... 3
1 Hardware description ........................................................................................................................... 6
1.1 Overview ........................................................................................................................................................ 6
2 Design-in ................................................................................................................................................... 7
2.1 Power management ................................................................................................................................... 7
2.1.1 Overview ............................................................................................................................................... 7
2.1.2 Power management configuration ................................................................................................. 8
2.2 Interfaces ...................................................................................................................................................... 9
2.2.1 UART interface .................................................................................................................................... 9
2.2.2 Display Data Channel (DDC) Interface ......................................................................................... 10
2.2.3 SPI Interface ...................................................................................................................................... 10
2.2.4 USB interface ..................................................................................................................................... 10
2.2.5 SQI Flash memory ............................................................................................................................. 11
2.3 I/O Pins ........................................................................................................................................................ 12
2.3.1 Time pulse .......................................................................................................................................... 12
2.3.2 External interrupt ............................................................................................................................. 13
2.3.3 Active antenna supervisor .............................................................................................................. 13
2.3.4 Electromagnetic interference and I/O lines ................................................................................. 14
2.4 Real-Time Clock (RTC) ............................................................................................................................. 15
2.4.1 RTC using a crystal ........................................................................................................................... 15
2.4.2 RTC derived from the system clock: “single crystal” feature .................................................. 15
2.4.3 RTC using an external clock ........................................................................................................... 15
2.4.4 Time aiding ......................................................................................................................................... 16
2.5 RF input ....................................................................................................................................................... 16
2.5.1 Active Antenna .................................................................................................................................. 16
2.5.2 Passive Antenna ............................................................................................................................... 16
2.5.3 Improved Jamming Immunity ........................................................................................................ 17
2.6 Safe Boot Mode (SAFEBOOT_N) ........................................................................................................... 17
2.7 System Reset (RESET_N) ....................................................................................................................... 18
2.8 Design-in checklist .................................................................................................................................... 18
2.8.1 General considerations .................................................................................................................... 18
2.8.2 Schematic design-in for EVA-8M / EVA-M8 series GNSS modules ....................................... 18
2.9 Pin description ........................................................................................................................................... 19
2.9.1 Pin name changes............................................................................................................................. 20
2.10 Layout design-in checklist ...................................................................................................................... 20
2.11 Layout .......................................................................................................................................................... 21
2.11.1 Footprint ............................................................................................................................................. 21
2.11.2 Paste mask ........................................................................................................................................ 21
2.11.3 Placement .......................................................................................................................................... 22