MEIG SLM770A - Page 5

SLM770A Module Hardware Design Manual
MeiG Smart Technology Co., Ltd 77/77
3.15 USB_BOOT Interface ............................................................................................................. 45
3.16 Analog audio interface............................................................................................................ 46
4 GNSS ................................................................................................................................................ 49
4.1 Basic Description .................................................................................................................... 49
4.2 GNSS performance ................................................................................................................ 49
4.3 Layout guide ........................................................................................................................... 49
5 Antenna Interface............................................................................................................................ 51
5.1 Introduction to Antenna Interfaces ......................................................................................... 51
5.2 RF Reference Circuit .............................................................................................................. 52
5.3 Antenna .................................................................................................................................. 53
5.3.1 Antenna Requirements ................................................................................................ 53
5.3.2 RF Output Power.......................................................................................................... 54
5.3.3 RF Receiving Sensitivity .............................................................................................. 56
5.3.4 Working Frequency ...................................................................................................... 57
5.3.5 Antenna Requirements ................................................................................................ 59
6 Electrical Characteristics ............................................................................................................... 61
6.1 Limiting Voltage Range........................................................................................................... 61
6.2 Environment Temperature Range .......................................................................................... 61
6.3 Electrical Characteristics of Interface in Working Status ....................................................... 62
6.4 Environmental Reliability Requirements ................................................................................ 63
6.5 ESD Features ......................................................................................................................... 64
6.6 Power Consumption ............................................................................................................... 64
7 Mechanical Characteristics ........................................................................................................... 66
7.1 Mechanical Dimensions of the Module .................................................................................. 66
7.2 Recommended Packaging ..................................................................................................... 67
7.3 Top View of the Module .......................................................................................................... 68
7.4 Bottom View of the Module..................................................................................................... 68
7.5 Module Effect Design ............................................................................................................. 69
8 Storage and Production ................................................................................................................. 70
8.1 Storage ................................................................................................................................... 70
8.2 Production Welding ................................................................................................................ 71
8.3 Packaging ............................................................................................................................... 71
9 Annex A Reference Documents and Abbreviations .................................................................... 72
9.1 Reference Documents ............................................................................................................ 72
9.2 Abbreviations .......................................................................................................................... 72
10 Annex B GPRS Coding Scheme ................................................................................................... 76