Low-cost digital power control

摘要

Digital power control normally is associated with a specialized complex power controller using a software language different from that used by the system microprocessor. In many applications a system has a microprocessor with unused I/O and memory capability, and power needs with some complexity. In such situations, substantial cost savings can be made by using both a simple power control IC and the existing microprocessor to perform the complex functions. Ex-amples are variable light-ing needs for displays and battery charging. The following discus- sion outlines low-cost in- terface circuitry that will allow this microprocessor-based control to occur and design considerations that must be addressed. Specific examples include voltage control approaches and current monitoring and control.