HT45FM2C datasheet(112/171 Pages) HOLTEK

112 / 171 page

Rev. 1.10

11�

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Rev. 1.10

11�

�a� �0� �01�

HT45FM2C

Brushless DC Motor Flash Type 8-Bit MCU

HT45FM2C

Brushless DC Motor Flash Type 8-Bit MCU

Preliminar�

Hall Sensor Noise Filter

ThisdeviceincludesaHallNoiseFilterfunctiontofilterouttheeffectsofnoisegeneratedbythe

largeswitchingcurrentsofthemotordriver.ThisgeneratednoisemayaffecttheHallSensorinputs

(HA/HB/HC),whichinturnmayresultinincorrectHallSensoroutputdecoding.

Severalregistersareusedtocontrolthenoisefilter.TheHNF_ENbitintheHNF_MSELregisteris

usedastheoverallenable/disablebitforthenoisefilter.

HNF_EN bit

Status

Noise Filter Off – HA/HB/HC not used

Noise Filter On

Hall Sensor Noise Filter Enable

ThesamplingfrequencyoftheHallnoisefilterissetupusingtheHFR_SEL[3:0]bits.

TheHCK_NUM[4:0]bitsareusedtosetuptheHallSensorinputcomparenumbers.

HCK_NUM[4:0]×Samplingspace=Anti-noiseability=HallDelay-Time.

ItshouldbenotedthatlongerHalldelaytimeswillresultinhigherrotorspeedfeedbacksignal

distortion.

Hall Sensor Delay Function

TheHallsensorfunctioninthedeviceincludesaHalldelayfunctionwhichcanimplementasignal

phaseforwardorphasebackwardoperation.Thefollowingsteps,whichshouldbeexecutedbefore

theHallDecoderisenabled,showhowthisfunctionisactivated.

• Step 1

SettheHallDecodetabletoselecteitherthephaseforwardorphasebackwardfunction.

• Step 2

SelectwhichCTMisusedtogeneratetheDelayTimeandsettheselectedCTMtoruninthe

CompareMatchModebyprogrammingtheCTM_SEL1~CTM_SEL0bits.

• Step 3

UsetheHDLY_MSELbittoselecttheHallDelaycircuitoperatingmode.Thedefaultvalueof

HDLY_MSELiszerowhichwilldisabletheHallDelaycircuit.IftheHDLY_MSELbitissethigh,

thentheHallDelaycircuitwillbeenabled.

• Step 4

EnabletheHallDecoderusingtheHDCENbit.

ThefollowingpointsshouldbenotedregardingtheHDLY_MSELbit.

♦

Whenthisbitislow,BUF1[2:0]andBUF2[2:0]willbeclearedtozero.

♦

Whenthisbitislow,TM0/TM1/TM5retaintheiroriginalTMfunctions.

♦

Whenthebitishigh,theCTMwhichisselectedbytheDelayfunctionwillbededicatedfor

usebytheHallDelaycircuit.

TheoriginalTMfunctionswillstillremainactiveexceptfortheTnONbitwhichwillbecontrolled

automaticallybythehardware.

HT45FM2C Datasheet(PDF) 112 Page - Holtek Semiconductor Inc

HT45FM2C Datasheet(HTML) 112 Page - Holtek Semiconductor Inc

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