3
Parts Lists and Schematics
This chapter presents a brief description of the SIM928 circuit design.
A complete parts list and circuit schematics are included.
In This Chapter
3.1
Circuit Description . . . . . . . . . . . . . . . . . . . 3 – 2
3.1.1
Microcontroller . . . . . . . . . . . . . . . . . 3 – 2
3.1.2
Battery charger . . . . . . . . . . . . . . . . . 3 – 2
3.1.3
Battery pack . . . . . . . . . . . . . . . . . . . 3 – 5
3.1.4
Isolated voltage regulator stage . . . . . . . . 3 – 5
3.1.5
Display and buttons . . . . . . . . . . . . . . 3 – 6
3.2
Parts List . . . . . . . . . . . . . . . . . . . . . . . . . 3 – 7
3.3
Schematic Diagrams . . . . . . . . . . . . . . . . . . 3 – 7
3 – 1
