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Time
Base
Accel Rate
Pulses Per Second
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WindowsApplication
TheDRV8811_RDcustomerEVMallowsforthepossibilityofcoordinatingstepratessuchthat
acceleratinganddeceleratingprofilesareachieved.Bothaccelerationanddecelerationarecontrolledby
thesameparameters,accelerationrateandtimebase.
Whenthemotorstarts,italwaysstartsattheslowedpulsespersecond(PPS)speed(62pulsesper
second).ThecontrollerwillacceleratethemotorinordertoreachthePPSspeed.Accelerationrateisan
8-bitnumber(0to255)thatgetsaddedtothecurrentPPSspeedandtimebaseisan8-bitnumber(0to
255)thatspecifieshowmanymillisecondswillelapsefromonespeedincreasetothenext.Oncethe
specifiedPPSspeedhasbeenachieved,theaccelerationstops.
Figure8.StepRate
Whenthemotoriscommandedtostop,theinverseofthedescriptionaboveoccurs.
TheWindowsApplicationframetocontrolspeed,accelerationanddeceleration,aswellasmotorstartand
stop,looksasportrayedinFigure9.
Figure9.SpeedControlFrame
SLVA344A–July2009–RevisedSeptember2009LaserandMotorDrives11
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