This application note provides the schematics, software listings, and circuit board layout for a PIC16C73 based Smart Battery Charger. The Demo Board, DC101, is available to selected customers through Linear Technology Corp. product marketing. The DC101 (Figure 1) is the Smart Battery Charger (SBC) portion of a Smart Battery System. A simplified block diagram of a Smart Battery System is shown in Figure 3 (refer to "The Smart Battery Charger Specification," Duracell).