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HT45F5R Datasheet(PDF) 104 Page - Holtek Semiconductor Inc |
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HT45F5R Datasheet(HTML) 104 Page - Holtek Semiconductor Inc |
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104 / 138 page  Rev. 1.10 104 De�e��e� 1�� �01� Rev. 1.10 105 De�e��e� 1�� �01� HT45F5R Charger ASSP Flash MCU HT45F5R Charger ASSP Flash MCU Battery Charging Constant Current and Constant Voltage Modes Thebatterychargingcurrentismeasuredusingaresistortoproduceavoltagewhichisinputtothe OPA0viaIsensepin.ThentheIsensevoltageisamplified10timesbyOPA0toproducea10×IS voltage.ThisvoltageisinputtoMUXchannel1andanA/DConverterinternalchannel. WhenMUXselectsCH1fromthe10×ISvoltageandtheOPA1positivevoltagecomesfromthe DAC,ifthe10×ISvoltageislessthantheDACvoltage,theA1Xoutputsignalistransmittedtothe currentmodePWMcontrollerviaaphoto-couplertoindirectlyincreasePWMdutycycleofthe powerMOSdrivingportofthecurrentmodePWMcontrolcircuits. Thebatterychargingvoltageismeasuredusingexternaltworesistorstoproduceavoltagewhich isinputtotheMUXviatheVsensepin.ThisvoltageisthesameasVs.WhentheMUXchannel selectsCH0,theVsvoltagewillbesentoutviatheSenseINpinandtheexternalresistertothe OPA1negativeinput.AstheOPA1non-invertinginputisfromthe12-bitDACinput,usetheDAC valuetodeterminethebatterychargingvoltage,becausetheOPA1output,A1X,transmitstheVs andDACdifferenceviaaphoto-couplertothecurrentmodePWMcontroller.IftheVsvoltageis lessthantheDACvoltage,A1XistransmittedtothecurrentmodePWMcontrollerviaaphoto- couplertoindirectlyincreasesthePWMdutycycleofthepowerMOSdrivingportofthecurrent modePWMcontrolcircuits. OCP and OVP Functions TheOCPfunctionisusedtomonitorthebatterychargingcurrent,whichisconvertedtoavoltage usingaresistor.ThevoltagesignalisinputtoOPA0viatheIsensepin.ThentheIsensevoltageis amplified10timesbyanOPA0toproducea10×ISvoltage.Ifthe10×ISvoltageisgreaterthan CP0NandPGD(PowerGoodDetection)itmeansthatthedevicepowersupplyisready,VDDis greaterthanorequalto4.6V,anOCVPinterruptwilloccurwhenthecorrespondinginterruptis enabledandwillforcetheA1Xoutputlow. TheOVPfunctionisusedtomonitorthebatterychargingvoltage,whichisconvertedtoavoltage usingtwoexternalresistors,andthevoltageisinputtotheVsensepin.IftheVsensepininput voltageisgreaterthan3VandPGD(PowerGoodDetection),thismeansthatthedevicepower supplyisready,VDDisgreaterthanorequalto4.6V,anOCVPinterruptwilloccurwhenthe correspondinginterruptisenabledandwillforcetheA1Xoutputlow. PGDR Register Bit 7 6 5 4 3 2 1 0 Na�e — — — — — — — PGDF R/W — — — — — — — R POR — — — — — — — 0 Bit7~1 Unimplemented,readas"0" Bit0 PGDF:PowerGoodDetectionreadyflag 0:DetectVDD<4.6V 1:DetectVDD≥4.6V Note:ThedevicecandetecttheVDDcurrentstatusbyPGDFbit. |
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