标签: pic振荡器

Theoscillatorcircuitisoneofthemostoverlookedareasofmicroprocessorcircuitdesign.Componentsareusuallyselectedbasedonthemanufacturerstables.Ifthecircuitstartsupandworks,fine,noothethoughtneedbegiventoit,right?Wrong.Manyconditionscannegativelyaffecttheperformanceofyoudesign.Highertemperaturesandlowersupplyvoltagescanlowertheloopgainintheoscillatorcircuit,causingpoor,slow,ornostart-up.Coldertemperaturesandhighersupplyvoltagescanincreasetheloopgainotheoscillatorcircuit,causingthecrystaltobeoverdriven,andpotentiallydamaged;orthecircuitcanbeforcedtoanotherharmonicandthrowoffthetiming,oceasefunctioningaltogether.ItisalsopossibletowastepowerthroughtheimproperselectionofcomponentsorClockmodes.MFACT001BasicPIC16/17OscillatorDesignFIGURE1:TYPICALPIERCEPARALLELAuthor:DanMatthewsRESONANTOSCILLATORMicrochipTechnologyInc.CIRCUITGainofinverter/amplifierisbasedonselectedClockmode.TheoscillatorcircuitisoneofthemostoverlookedClockModes:areasofmicroprocessorcircuitdesign.Components……