MeiG_SLM320_Hardware Design Manual
MeiG Smart Technology Co., Ltd
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Contents
Important Notice ....................................................................................................................................... 1
Revision History ....................................................................................................................................... 2
Contents .................................................................................................................................................... 3
1 Introduction ....................................................................................................................................... 5
1.1 Safety instruction ...................................................................................................................... 6
2 Product Overview ............................................................................................................................. 7
2.1 General Description .................................................................................................................. 7
2.2 Key Features ............................................................................................................................. 7
2.3 Functional block diagram ........................................................................................................ 10
2.4 Evaluation Kit .......................................................................................................................... 11
3 Application Interface ...................................................................................................................... 12
3.1 General Description ................................................................................................................ 12
3.2 Pin Assignment ....................................................................................................................... 13
3.3 PIN Description ....................................................................................................................... 14
3.4 Power source .......................................................................................................................... 22
3.4.1 Power Supply ................................................................................................................ 23
3.4.2 Reduce voltage drop ..................................................................................................... 23
3.4.3 Power Supply Reference Circuit ................................................................................... 24
3.4.4 VDD_EXT voltage output .............................................................................................. 24
3.5 Start up .................................................................................................................................... 25
3.5.1 PWRKEY Pin boot ........................................................................................................ 25
3.5.2 Power off ....................................................................................................................... 26
3.6 Reset Function ........................................................................................................................ 26
3.6.1 Hardware Reset ............................................................................................................ 26
3.6.2 AT command Reset ...................................................................................................... 27
3.7 USIM/SIM Interface ................................................................................................................. 28
3.8 USB port .................................................................................................................................. 30
3.8.1 USB Pin Description ..................................................................................................... 30
3.8.2 USB Reference Circuit .................................................................................................. 30
3.9 Serial Port ............................................................................................................................... 31
3.10 Status indication ..................................................................................................................... 33
3.11 Low Power Mode .................................................................................................................... 35
3.11.1
Flight mode ................................................................................................................. 35
3.11.2 Sleep mode ................................................................................................................. 35
3.11.3 Ultra low power mode ................................................................................................. 36
3.12 ADC Function ......................................................................................................................... 36
3.13 USB_BOOT Port ..................................................................................................................... 37
4 GNSS Receiver ................................................................................................................................ 38
4.1 General Description ................................................................................................................ 38
4.2 GNSS Performance ................................................................................................................ 38
4.3 Layout Guidelines ................................................................................................................... 38
4.4 Antenna connection ................................................................................................................ 38
5 Antenna interface............................................................................................................................ 39
5.1 Introduction to Antenna Interface ........................................................................................... 39
