Microcontroller-Driven Power Supply - 2

44 EE Ju MICROCONTROLLER-DRIVEN POWER SUPPLY 2 This month we deal with the operation, construction and setting up of the intelligent power supply. Details on the operation of the microcontroller-driven power supply are purposely arranged to precede those on construction and setting up in order to provide good insight in the interaction between the instrument"s software and hardware. Controls, functions and oper- ation Figure 9 shows the layout of the front panel for refererence in the description of the various instrument controls. The self-adhesive front panel foil with inte- grated membrane switches is available ready-made through the Readers Ser- vices. Only two components on the front panel are not controlled by the 8751: the on/off switch and the MAX LED beside the digital current read-out. This LED (D5 in Fig. 8) is driven by 1C2 (Fig. 2) via the controller board. The basic function of the rotary contact encoder (SETTING) was already discussed in Part 1 of this article. The ...