µ P 管理芯片控制可编程滤波器

摘要：一个应用程序显示如何使用微处理器的监督使用程序双条筛选器。使用重置电路和打包带到电源失效比较器延时电路，筛选器可以轻松地进行编程，以在通电使用此过程中提供正确的截止频率的时间延迟重置电路。

Maxim>AppNotes>FILTERCIRCUITS(ANALOG)Keywords:analogfilter,microprocessorsupervisor,uPsupervisor,resetcircuit,powerfailcomparatorJul09,1998APPLICATIONNOTE23P-SupervisorChipControlsProgrammableFilterAbstract:Anapplicationshowinghowtheuseofamicroprocessorsupervisorcanbeusedtoprogramadualsectionfilter.Usingthetimedelayfromtheresetcircuitandstrappingittothepower-failcomparatorwithadelaycircuit,thefiltercaneasilybeprogrammedtoprovidethecorrectcutofffrequenciesduringpowerupusingthisresetcircuit.Certaindual-sectionfilterICshaveacommon7-bitportforprogrammingthetwocutofffrequencies(fC).IfbothsectionsrequirethesamefC,youcanstrapanappropriatecodetotheportpins,