Specifications

SIM7028 Hardware Design V1.00
www.simcom.com 4 / 48
Contents
1 Introduction........................................................................................................................................ 8
1.1 Product Outline................................................................................................................................................. 8
1.2 Hardware Interface Overview.........................................................................................................................9
1.3 Hardware Block Diagram..............................................................................................................................10
1.4 Functional Overview...................................................................................................................................... 10
2 Package Information......................................................................................................................12
2.1 Pin Assignment Overview.............................................................................................................................12
2.2 Pin Description................................................................................................................................................13
2.3 Mechanical Information................................................................................................................................. 16
2.4 Footprint Recommendation.......................................................................................................................... 17
3 Interface Application......................................................................................................................18
3.1 Power Supply..................................................................................................................................................18
3.2 Power on/Power off/Reset Function........................................................................................................... 18
3.2.1 Power on.................................................................................................................................................18
3.2.2 Power off.................................................................................................................................................19
3.2.3 Reset Function.......................................................................................................................................19
3.3 WAKEUP Description.................................................................................................................................... 20
3.4 GPIO power domain 1.8V/3.3V selection.................................................................................................. 21
3.5 UART Interface............................................................................................................................................... 22
3.5.1 UART1 is used for serial communication..........................................................................................22
3.5.2 UART1 is used for firmware upgrade and calibration..................................................................... 22
3.5.3 Debug serial port UART0.....................................................................................................................23
3.6 RI signal behaviors........................................................................................................................................ 25
3.7 ADC.................................................................................................................................................................. 25
3.8 SIM Card Interface......................................................................................................................................... 25
3.9 Network Status............................................................................................................................................... 26
4 Operation Mode...............................................................................................................................29
4.1 Operating mode..............................................................................................................................................29
4.2 PSM.................................................................................................................................................................. 30
4.3 PSM wake up.................................................................................................................................................. 31
5 RF Specifications............................................................................................................................32
5.1 LTE RF Specifications...................................................................................................................................32
5.2 LTE Antenna Design Guide..........................................................................................................................34
5.3 RF Layout Design Guide...............................................................................................................................35
5.3.1 RF layout.................................................................................................................................................35
5.3.2 LTE antenna and other communication system isolation notice...................................................36
6 Electrical Specifications............................................................................................................... 37
6.1 Normal Operating Conditions.......................................................................................................................37
6.2 Current Consumption.................................................................................................................................... 37
6.3 ESD Notes.......................................................................................................................................................39
7 SMT Production Guide
..................................................................................................................
40
7.1 Top and Bottom View of SIM7028.............................................................................................................. 40
7.2 Typical SMT Reflow Profile.......................................................................................................................... 40
7.3 Moisture Sensitivity Level (MSL)................................................................................................................. 40
7.4 Baking.............................................................................................................................................................. 41
8 Packaging......................................................................................................................................... 42
8.1 Tray packaging............................................................................................................................................... 42
9 Appendix...........................................................................................................................................45